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type version ordering code package peb 2045-n va3 q67100-h8602 p-lcc-44 (smd) peb 2045-p va3 q67100-h8322 p-dip-40 pef 2045-n va3 q67100-h6055 p-lcc-44 (smd) pef 2045-p va3 q67100-h6056 p-dip-40 memory time switch cmos (mtsc) preliminary data cmos ic peb 2045 pef 2045 p-lcc-44 p-dip-40 1features l time/space switch for 2048-, 4096- or 8192-kbit/s pcm systems l switching of up to 512 incoming pcm channels to up to 256 outgoing pcm channels l 16-input and 8-output pcm lines l different kinds of modes (2048, 4096, 8192 kbit/s or mixed mode) l configurable for primary access and standard applications l programmable clock shift with half clock step resolution for input and output in primary access configuration l configurable for a 4096- and 8192-khz device clock l tristate function for further expansion and tandem operation l tristate control signals for external drivers in primary access configuration l 2048-khz clock output in primary access configuration l space switch mode l 8-bit m p interface l single + 5 v power supply l advanced low power cmos technology l pin and software compatible to the peb 2040 semiconductor group 1 01.94
semiconductor group 2 peb 2045 pef 2045 pin configurations (top view) p-dip-40 p-lcc-44
peb 2045 pef 2045 semiconductor group 3 1.1 pin definitions and functions pin no. p-lcc pin no. p-dip symbol input (i) output (o) function 11 v ss i ground (ov) 3 2 sp i synchronization pulse: the pex 2045 is synchronized relative to the pcm system via this line. 4 7 9 11 13 14 15 16 17 18 19 3 5 7 9 11 12 13 14 15 16 17 in1 in5 in9 in13 in14 in15 in10 in11 in6 in7 in2 i i i i i i i i i i i pcm-input ports: serial data is received at these lines at standard ttl levels. 5 8 10 12 4 6 8 10 in0/tsc0 in4/tsc1 in8/tsc2 in12/tsc3 i/o i/o i/o i/o pcm-input port / tristate control: in standard configuration these pins are used as input lines, in primary access configuration they supply control signals for external devices. 20 18 in3/dcl i/o pcm-input port / data clock: in standard configuration in3 is the pcm input line 3, in primary access configuration it provides a 2048-khz data clock for the synchronous interface. 21 19 a0 i address 0: when high, the indirect register access mechanism is enabled. if a0 is logical 0 the mode and status registers can be written to and read respectively. 22 20 cs i chip select: a low level selects the pex 2045 for a register access operation. 23 21 v dd i supply voltage: 5 v 5 %. 24 22 rd i read: this signal indicates a read operation and is internally sampled only if cs is active. the mtsc puts data from the selected internal register on the data bus with the falling edge of rd . rd is active low.
semiconductor group 4 peb 2045 pef 2045 pin definitions and functions (cont?) pin no. p-lcc pin no. p-dip symbol input (i) output (o) function 25 23 wr i write: this signal initiates a write operation. the wr input is internally sampled only if cs is active. in this case the mtsc loads an internal register with data from the data bus at the rising edge of wr . wr is active low. 26 27 29 30 31 32 33 34 24 25 26 27 28 29 30 31 db0 db1 db2 db3 db4 db5 db6 db7 i/o i/o i/o i/o i/o i/o i/o i/o data bus: the data bus is used for communication between the mtsc and a processor. 35 36 37 38 40 41 42 43 32 33 34 35 36 37 38 39 out7 out6 out5 out4 out3 out2 out1 out0 0 0 0 0 0 0 0 0 pcm-output port: serial data is sent by these lines at standard cmos or ttl levels. these pins can be tristated. 44 40 clk i clock: 4096- or 8192-khz device clock.
peb 2045 pef 2045 semiconductor group 5 1.2 functional symbol figure 1 functional symbol for the standard configuration figure 2 functional symbol for the primary access configuration
semiconductor group 6 peb 2045 pef 2045 1.3 device overview the siemens memory time switch pex 2045 is a monolithic cmos circuit connecting any of 512 incoming pcm channels to any of 256 outgoing pcm channels. the on-chip connection memory is accessed via the 8-bit m p interface. the pex 2045 is fabricated using the advanced cmos technology from siemens and is mounted in a p-dip-40 or a p-lcc-44 package. inputs and outputs are ttl-compatible. the pex 2045 is pin and software compatible to the peb 2040. in addition, it includes the following features: l 4096-khz device clock l 4096-kbit/s pcm-data rate l primary access configuration l fast connection memory access 1.4 system integration the main application fields for the pex 2045 are in switches and primary access units. figure 3 shows a non-blocking switch for 512 input and 512 output channels using only two devices. figure 4 shows how 8 devices can be arranged to form a non-blocking 1024-channel switch. figure 3 memory time switch 16/16 for a non-blocking 512-channel switch this is possible due to the tristate capability of the pex 2045. its00583 8 8 pcm out 2 mhz mhz 2 in pcm 16 pex 2045 pex 2045
peb 2045 pef 2045 semiconductor group 7 figure 4 memory time switch 32/32 for a non-blocking 1024-channel switch figure 5 shows the architecture of a primary access board with common channel signaling using four cmos devices. it exhibits the following functions: line interface (peb 2235) clock and data recovery (peb 2235) coding/decoding (peb 2035) framing (peb 2035) elastic buffer (peb 2035) switch (pex 2045) system adaptation (pex 2045) data link signaling handling (sab 82520) m p interface (all devices) its00584 8 8 pcm out 2 2 in pcm 16 11 21 12 22 14 24 13 23 16 8 8 mhz mhz pex 2045 pex 2045 pex 2045 pex 2045 pex 2045 pex 2045 pex 2045 pex 2045
semiconductor group 8 peb 2045 pef 2045 since the pex 2045 is a switch for 256 output channels and the sab 82520 is actually a dual channel controller a quad primary access unit with a non-blocking switch requires a total of 11 devices, 4 ipat (peb 2235) 4 acfa (peb 2035) 2 hscc (sab 82520) 1 mtsc (pex 2045), as shown in figure 6 . figure 5 architecture of a primary access board
peb 2045 pef 2045 semiconductor group 9 figure 6 realization of a quad primary access interface and switch with 11 cmos devices its04996 ipat line interface interface system synchronous 2-mhz interface peb 2235 r 2035 peb acfa mtsc peb 2045 hscc sab 82520
semiconductor group 10 peb 2045 pef 2045 figure 7 basic connections to a digital switching system figure 7 shows the pex 2045 in its different applications in a digital switching system. it is used here as the main device in the switching network (sn), as a group switch (gs) to connect different digital or analog subscriber line modules (slma, slmd) or digital interface units (diu) with one another and as the interface device for the digital interface units. the slics and sicofis (peb 2060) are subscriber line drivers and codec-filter devices, respectively, for the analog line. sbc (peb 2080), iec (peb 2090), ibc (peb 2095) and icc (peb 2070) are the layer-1 and layer-2 isdn devices for the digital line. the peripheral board controller pbc (peb 2050) multiplexes the different lines in a subscriber line module to the 2- or 4-mbit/s highways, which are input to the group switch. itc03655 line trunk group r sicofi slic pbc pbc slic sicofi r icc sbc,ibc pbc pbc ibc,iec icc analog digital mbit/s 2,4,8 mtsr pcm acfa ipat mtsc mtsc 2048 kbit/s 1544 kbit/s r acfa acfa r ipat ipat r 2,4,8 mbit/s mtsr group processor coordination processor line trunk group group processor group switch switching network
peb 2045 pef 2045 semiconductor group 11 2 functional description the pex 2045 is a memory time switch device. it can connect any of 512 pcm input channels to any of 256 output channels. the input information of a complete frame is stored in the on-chip 4-kbit speech memory sm ( see figure 8 ). the incoming 512 channels of 8 bits each are written in sequence into fixed positions in the sm. this is controlled by the input counter in the timing control block with a 8-khz repetition rate. for outputting, the connection memory (cm) is read in sequence. each location in cm points to a location in the speech memory. the byte in this speech memory location is read into the current output time-slot. the read access of the cm is controlled by the output counter which also resides in the timing control block. hence the cm needs to be programmed beforehand for the desired connection. the cm address corresponds to one particular output time-slot and line number. the contents of this cm-address points to a particular input time-slot and line number (now resident in the sm). the pex 2045 works in standard configuration for usual switching applications, and in the primary access configuration where it realizes, together with the peb 2035 (acfa) and the peb 2235 (ipat), the system interface for up to four primary multiplex access lines. in the following chapters the functions of the pex 2045 will be covered in more detail.
semiconductor group 12 peb 2045 pef 2045 figure 5 block diagram of the pex 2045 m p interface mod sta iar cgr csr connection memory cm timing control in1 in2 in5 in6 in7 in9 in10 in11 in13 in14 in15 input buffer speech memory sm output buffer out0 out1 out2 out3 out4 out5 out6 out7 clk sp a0 db7- db0 itb00585
peb 2045 pef 2045 semiconductor group 13 2.1 basic functional principles preparation of the input data the pex 2045 works in 2048-, 4096- or 8192-kbit/s pcm systems. the frame frequency is 8000 hz in all 3 types of systems. therefore a frame consists of 32-, 64- or 128 time-slots of 1 byte each, respectively. in order to fill the speech memory, which has a fixed capacity of 512 channels, either 16-, 8- or 4 input lines are necessary, respectively. thus, in 4- and 8-mhz systems only some of the 16 input lines can be used. moreover, the pex 2045 can also work with two different input data rates simultaneously. in this case some of the pcm input lines operate at one data rate, while others operate at another. table 1 states how many input lines are operating at the different data rates for all possible input data rate combinations. in the following they will be referred to as input modes. the input mode the pex 2045 is actually working in has to be programmed into the mode register, bits mi1, mi0, mo1, mo0. in chapter 4.1 you will find a complete description which input line is connected to which system, for each of the input modes. table 1 possible input modes the pex 2045 runs with either a 4096- or a 8192-khz device clock as selected with cfg:cps. data rates and clock frequencies may be combined freely. however, processing 8192-kbit/s data, a 8192-khz clock must be supplied. the preparation of the input data according to the selected input mode is made in the input buffer. it converts the serial data of a time-slot to parallel form. in standard configuration time-slot 0 begins with the rising edge of the sp pulse as shown in upper half of figure 9 denoted csr: (0000xxxx). input modes type 16 2048 kbit/s single mode 8 4096 kbit/s single mode 4 8192 kbit/s single mode 2 8192 + 8 2048 kbit/s mixed mode 4 4096 + 8 2048 kbit/s mixed mode
semiconductor group 14 peb 2045 pef 2045 figure 9 latching instant for input data
peb 2045 pef 2045 semiconductor group 15 as can be seen there the beginning of a input time-slot is defined such, that the input lines have settled to a stable value, when the datum is actually sampled. 4096- and 8192-kbit/s data is sampled in the middle of the bit period at the falling edge of the respective data clock. 2048-kbit/s data is sampled after 3/4 of the according bit period, i.e. with the rising edge of the 4 th 8192-khz clock cycle or the falling edge of the 2 nd 4096-khz clock cycle of the considered bit period. in the primary access configuration a different timing scheme may apply to the odd input lines. they are affected by the content of the clock shift register (csr), which can be programmed via the m p interface ( see section indirect register access ). the clock shift register holds the information, how the frame structure is shifted in the primary access configuration. its content defaults to 00 h after power up and is also set to this value, whenever the standard configuration is selected. the four most significant bits of the clock shift register are of interest for the input lines. they only affect the odd input lines ( see section clock shift register access ): the frame structure can be advanced by the number of bit periods programmed to the rs2, rs1 and rs0 bits of the csr. for example, programming the csr with (1100xxxx) a new frame starts 6-bit periods before the rising edge of the sp pulse. selecting rre to logical 1 the frame is delayed by half a bit period ( see figure 9 ). the data is then sampled in the middle of the respective bit period for all data rates. the last line of figure 9 shows the sampling instants for the csr entry (1001xxxx). then the input frame is advanced by 4-bit periods and delayed by a half resulting in an 3 1/2-clock period advancement of the input frame. for further examples refer to figure 21 . thus the frame structure may be selected to begin at any 1/2-bit period value between a resulting advancement of 7-bit periods and a resulting delay of 1/2 a bit period. setting csr = 0x h the same timing conditions apply to even and odd inputs. then all system interface inputs are processed in the same way they are in the standard configuration. speech memory the prepared input data is written into the speech memory sm. it has a capacity of 512 bytes to store one frame of all active input lines. the destination sm addresses are supplied by the input counter, which resides in the timing control block. they ensure that a certain input channel is always written to the same physical speech memory location. the input counter is synchronized with the rising edge of the sp signal. the 9-bit addresses to read the speech memory are supplied by the connection memory. these are programmable and need not follow any recognizable sequence. write and read accesses of the sm occur alternately. connection memory the connection memory (cm) is a ram organized as 256 10 bits. it contains the 9-bit speech memory address and a validity bit for the 256 possible output channels. while the speech memory address points to a location in the sm, the validity bit is processed in the timing control block: if the te bit in the mode register ( see paragraph 4.1 ) is set to logical 0, the validity bit is directly
semiconductor group 16 peb 2045 pef 2045 forwarded to the output buffer as the tristate control signal. otherwise (if te = high), an all-zero speech memory address causes the output for the associated channel to be tristate. in this case the all-zero speech memory address (time-slot 0 on output line 0) cannot be used for switching purposes. figure 10 the influence of the connection memory on the output validity the cm is written via the m p interface using the indirect register access scheme ( see section indirect register access ). it is read using addresses supplied by the output counter which resides in the timing control block. the output counter generates addresses that form an enumerative sequence. thus the connection memory is read cyclically and establishes the correct time-slot sequence of the outputs. the output counter is synchronized with the falling and rising edge of the sp signal in standard and primary access configurations, respectively. the connection memory addresses and data encode the number of the output and input channels, respectively. for a detailed description of the code please refer to section indirect register access and connection memory access. itd03658 output time-slot + line # bit 8-0 connection tristated otherwise enabled mode register tristate enable bit bit9 va input time-slot + line # content bit0 bit7 address cm = o ? h = 1? yes yes te = 0 te = 1
peb 2045 pef 2045 semiconductor group 17 output buffer the output buffer rearranges the data read from the speech memory. it basically converts the parallel data to serial data. depending on the tristate control signal from the timing control block the output buffer outputs the data or switches the line to high impedance. the mode register (mod) bits mi1, mi0, mo1 and mo0 control this process. the possible output modes are listed in table 2 . table 2 possible output modes figure 11 shows, when the single bits are output. in standard configuration they are clocked off at the rising clock edge at the beginning of the considered bit period. time-slot 0 starts two t cp8 before the falling edge of the sp pulse. in primary access configuration the even output lines are affected by the xs2, xs1, xs0 and xfe entries in the clock shift register. the output frame is synchronized with the rising edge of the sp- signal. assuming a csr entry x0 h the output frame starts with the rising edge of the sp pulse. programming the xs2, xs1 and xs0 bits with a value deviating from binary 000 the output frame is delayed by 8 d - (xs2, xs1, xs0) b bit periods. e.g., a csr entry of (xxxx0010) delays the output frame by 7-bit periods relative to the rising sp-pulse edge. programming csr:(xxxxxxx1) the output frame is delayed by another half a device clock period. in figure 11 the outputting instants are shown for a device clock of 4096 and 8192 khz and a csr:(xxxx0001). the last line in figure 11 shows an even 8192-kbit/s output line for the csr entry (xxxx0111) and a 8192-khz device clock. the output frame is delayed by 5 1/2-bit periods. for further examples refer to figure 21 . if the csr is programmed such that xs2 is identical to rs2, xs1 to rs1, xs0 to rs0 and rre to xfe the time-slot boundaries of input and output coincide. programming xs2, xs1, xs0 as well as rs2, rs1, rs0 to logical 0 input and output time-slots coincide. otherwise the system interface output frame starts one time-slot after the system interface input. this can be seen comparing for example the lines 0100xxxx and xxxx0100 in figure 21 . output modes type 8 2048 kbit/s single mode 4 4096 kbit/s single mode 2 8192 kbit/s single mode 1 8192 + 4 2048 kbit/s mixed mode 2 4096 + 4 2048 kbit/s mixed mode
semiconductor group 18 peb 2045 pef 2045 figure 11 clocking off instant of output data itd03747 56 7 bit0 1 2 3 4 5 6 7 0 1 2 3 t cp8 time slot 127 67 0 1 2 3 4 5 time slot 63 0 7 time slot 31 12 time slot 0 time slot 0 time slot 0 time slot 1 csr : (xxxx 0000) 2048 kbit/s data rate data rate 4096 kbit/s data rate 8192 kbit/s clk 4096 khz clk 8192 khz configuration standard configuration primary access sp sp 8192 kbit/s data rate 4096 kbit/s data rate data rate 2048 kbit/s time slot 1 time slot 0 time slot 0 time slot 0 1 time slot 31 70 time slot 63 4 3 2 1 0 7 6 time slot 127 2 1 0 7 6 5 4 3 2 1 bit0 7 6 5 67 0 1 2 3 4 time slot 63 0 7 time slot 31 1 time slot 0 time slot 0 2048 kbit/s data rate data rate 4096 kbit/s 56 7 bit0 1 2 3 4 5 6 7 0 time slot 127 time slot 0 data rate 8192 kbit/s 4 csr : (xxxx 1101) csr : (xxxx 0001) 4096 khz clock csr : (xxxx 0001) 8192 khz clock 2 4 2 - - - - - - - - - - - - - - -- - - - - - - - - - - - - -
peb 2045 pef 2045 semiconductor group 19 2.2 microprocessor interface and registers the pex 2045 is programmed via the m p interface. it consists of the data bus db7 ?db0, the address bit a0, the write (wr ), the read (rd ) and chip select (cs ) signal, as shown in figure 12 . figure 12 the pex 2045 controlled by a microprocessor to perform any register access, cs has to be zero. this pin is provided, so that a single chip can be activated in an environment where one microprocessor controls many slave processors ( see figure 20 ). the pex 2045 incorporates 4 user programmable registers, l the mode register (mod) l the status register (sta) l the configuration register (cfr) and l the clock shift register (csr) as well as l the connection memory (cm). the mode register is a write only register; the status register is a read only register. cfr, csr and cm can be read and written. the single address bit a0 does not offer enough address space to encode all access possibilities. therefore the indirect access scheme is used to access the cfr, csr and cm. it uses the indirect access register (iar), which is provided on chip.
semiconductor group 20 peb 2045 pef 2045 using the 3 signals a0, wr and rd the iar, mod and sta registers can be identified according to table 3 . table 3 addressing of the direct registers the a0 address distinguishes between the iar and the directly accessible registers. the wr and rd strobes combined with an a0 equal to logical 0 identify the mode- and status registers, respectively. the data bus contains the associated information. in the following paragraphs the indirect register access and the register contents will be described. indirect register access (a0 = 1) to perform an indirect register access 3 consecutive instructions have to be programmed. one indirect register access has to be completed before the next one can begin. the 3 instructions of the indirect access operate on the indirect access register. it receives, in sequence the control byte, the data byte and the address byte according to table 4 . table 4 iar byte structure the data byte contains the information which shall be written into the connection memory or the indirect registers, i.e. the csr or the cfr. the address byte indicates which one of the indirect registers shall be accessed or in which location of the cm the data shall be written. the control byte determines whether the connection memory or one of the indirect registers shall be accessed and whether a write or read operation shall be performed. before an indirect access is started, the z- and b-bits of the status register must be 0. with the first instruction the z bit is set ( see chapter 4.2 ). after the third instruction the pex 2045 accesses the physical register or memory location. this access requires maximally 900 ns. after the access finishes the z bit is reset. the 3 instructions are separated by intervals where both wr and rd are in a high state. figure 13 illustrates a write operation on the iar. a0 write operation read operation 0 mod sta 1 iar iar bit 7 bit 0 0 0 k1 k0 0 0 c1 c0 control byte d7 d6 d5 d4 d3 d2 d1 d0 data byte ia7 ia6 ia5 ia4 ia3 ia2 ia1 ia0 address byte
peb 2045 pef 2045 semiconductor group 21 it is possible to read or write the direct access registers (i.e. the mode or status register) while an indirect access is in progress. thus the status register may be read in the time intervals that separate the three sequential indirect access instructions. also, the current indirect access may be aborted by setting the mod:ri. figure 13 timing diagrams for iar itd03660 sta:z rd wr t 900 ns write control byte byte data write write address byte a) write iar _ < itd03661 sta:z rd wr b) read iar 900 ns t _ < _ < t 900 ns
semiconductor group 22 peb 2045 pef 2045 bits k1 and k0 of the control byte determine whether a cm or an indirect register access shall be performed. when k1 and k0 are both logical 1, one of the indirect registers is accessed. for all other combinations the connection memory is accessed. table 5 decoding the k1 and k0 bits in the case of a cm access the k1 and k0 bits also indicate the type of the access: one bit being logical 1 indicates a write, both bits being logical 0 a read operation. the same distinction function is performed by bit c0 of the control byte in the case of an indirect register access. according to table 6 a high on c0 initiates a read, a low a write operation. the value of the c1 bit is of no significance in this application. however to avoid future incompatibility problems, it is strongly recommended to set c1 to logical 0. the address byte holds the cm address for a connection memory access, for indirect register access it indicates which one of the two indirect registers is accessed. a hexadecimal fe h addresses the configuration register, a hexadecimal ff h the clock shift register. table 6 lists all possible choices of indirect register accesses. table 6 addressing of the indirect registers the data to be written to the different registers or the cm reside in the data byte. for cm accesses not 8 but 10 bits are written into the selected location. the two bits in excess come from the c0 and c1 bits of the control byte and are interpreted as the most significant bits of the data word. (d9 and d8). accordingly the 3 cm access instructions are interpreted as shown in table 7 . k1 k0 accessed register r/w 0 0 1 1 0 1 0 1 cm cm cm indirect register r w w r or w k1 k0 c0 address byte (hex) access 1 1 1 1 1 1 1 1 1 0 1 0 fe fe ff ff cfr read cfr write csr read csr write
peb 2045 pef 2045 semiconductor group 23 table 7 connection memory access ia byte structure the following example illustrates how an indirect memory access works. the instruction sequence 00110000 01010101 a0 = 1, wr = 0, rd = 1, cs = 0 11111111 writes the hexadecimal value 55 h into the clock shift register. the instruction sequence 00010010 00000000 a0 = 1, wr = 0, rd = 1, cs = 0 10101010 writes the hexadecimal value 200 h into the connection memory location aa h thus tristating the output. to read the indirect registers or the cm two sequences of 3 instructions each have to be programmed. in the first sequence the pex 2045 is instructed which register or cm address to read. the data transferred to the pex 2045 in this first sequence is of no importance. with the first write instruction sta:z is set. after the first 3 instructions the pex 2045 needs 900 ns to read the specified location and to write the result to the iar. it overwrites the data byte and in the case of a cm-read operation additionally bits 1 and 0 of the control byte. the status register bit z is reset after maximally 900 ns. then 3 read operations follow. again, sta:z is set with the first read instruction. the 3 instructions read 3 bytes from the iar. figure 13b shows this procedure. the data byte and, in the case of a cm-read operation, the c1 and c0 bits in the control byte show the values read from the indirect registers or the cm. the k0, k1 bits and the address byte have not changed their values since the proceeding write instruction sequence. after the third read operation the pex 2045 needs another 900 ns to reset the indirect access mechanism and the z bit in the status register. bit 7 bit 0 0 0 k1 k0 0 0 d9 d8 control byte d7 d6 d5 d4 d3 d2 d1 d0 data byte ia7 ia6 ia5 ia4 ia3 ia2 ia1 ia0 address byte
semiconductor group 24 peb 2045 pef 2045 with the following instruction sequence 00000001 11111111 a0 = 1, wr = 0, rd = 1, cs = 0 10101010 the byte sequence 11001110 00000000 a0 = 1, wr = 1, rd = 0, cs = 0 10101010 can be read. the cm location aa h , which has been written to 200 h in the last example is read again. bits 7, 6, 3, 2, of the control byte showing logical 0 in the first byte at the beginning of the read access reappear as logical 1 in the fourth byte. this is due to the internal device architecture. these bits are unused and are recommended to be set to logical 0 to avoid future incompatibility problems. in csr and cfr read accesses, bit 1 and bit 0 (c1 and c0) of the read control byte have a value of logical 1. register contents you will find a detailed description of the different register contents in section 4 . this paragraph only gives a short overview of the different registers: the mode register contains bits to determine the operation mode and the output tristating scheme, to control the cm reset mechanism, to interrupt the indirect access mechanism and to switch the chip to standby. the status register consists of 3 bits. they tell whether the pex 2045 is busy resetting its connection memory or performing an indirect access or whether operational conditions have occurred which might lead to a partial or complete loss of data in the connection and speech memory. bits 4 to 0 of the status register default to logical 0. the clock shift register holds information on how the frame structure is advanced or delayed relative to the synchronization pulse. it is only active for the system interface in the primary access configuration. see chapter 2.4 . in standard configuration it is set to logical 0. the configuration register is used to select the device clock frequency and the configuration in which the device is used. the most significant 6 bits default to logical 1, if the register is read. the connection memory content and address contain the connection information. specifics are explained in the following sections.
peb 2045 pef 2045 semiconductor group 25 2.3 standard configuration a logical 1 in the cfs bit of the configuration register sets the pex 2045 in standard mode (default after power up). all modes from table 9 can be used. the space switch mode (mi1, mi0, mo1, mo0 = 0 h ) is a special mode and will be covered in chapter 2.5. it has to be ensured that the data rate is not higher than the selected device clock (4096 or 8192 khz). in this application 512 channels per frame are written into the speech memory. each one of them can be connected to any output channel. according to table 10 and table 14 and depending on the selected mode the least significant bits of the connection memory address and data contain the logical pin numbers, the most significant bits the time-slot number of the output and input channels. the following example explains the programming sequence. time-slot 7 of the incoming 8192-kbit/s input line in14 shall be connected to time-slot 6 of the output line out 5 of an 2048-kbit/s system. according to table 10 in 8192-kbit/s systems the input line in14 is the logical input line 2. output line number and logical output number are identical to one another. therefore the following byte sequence on the data bus has to be used to program the cm properly ( see table 14 ): 00010000 00011110 00110101 the frame, for all input channels, starts with the rising edge of the sp signal. the frame for all output channels begins two t cp8 (with 8192-khz device clock) or one t cp4 period (4096-khz device clock) before the falling sp edge. the period of time between the rising and the falling edge of the sp pulse should be t sph = (2 + n 4) t cp8 (0 n 255) = (1 + n 2) t cp4 n is an user defined integer. by varying n, t sph can be varied in 2048-khz clock period steps. for an example using n = 2 refer to figure 14 .
semiconductor group 26 peb 2045 pef 2045 figure 14 syp duration for n = 2 the device is synchronized after 3 sp pulses ( see chapter 3.2 ). 2.4 primary access configuration a logical 0 in the cfs bit of the configuration register selects the pex 2045 for primary access applications. in this case the pex 2045 is an interface device connecting a standard pcm interface (system interface) with another pcm interface e.g. an intermediate interface for connections to primary loops (synchronous interface). for both a serial interface is provided. l the synchronous 2048-kbit/s interface consists of four input and four output lines with a bit rate of 2048-kbit/s. this interface can be used to connect the pex 2045 to up to four primary trunk lines via coding / decoding devices with frame alignment function (e.g. peb 2035 acfa) and line transceivers with clock and data recovery (e.g. peb 2235 ipat) and to signaling processors (e.g. the sab 82520 hscc). l the system interface is not confined to one data rate but can operate at the full choice of the pex 2045 data rates: 2048, 4096 and 8192 kbit/s. a clock shift in a range of 7 1/2 clock steps with half clock step resolution may be programmed independently for inputs and outputs. the frame for all input- and output lines starts with the rising edge of the sp signal. in the primary access mode the signals tsc0 , tsc1 , tsc2 and tsc3 indicate when the associated system interface output is valid. the signal dcl supplies a 2-mhz clock which can be used for other devices at the synchronous interface, e.g. the high level serial communication controller hscc (sab 82520). in the primary access configuration only those modes which support at least 4 input and 4 output lines at 2048 kbit/s can be used. these are the modes mi1, mi0, mo1, mo0 = 0 h , a h , f h ( see table 9 ). programming the cm in the primary access configuration is described in tables 17 and 18 . the least significant 2 bits of the data byte and the least significant bit of the address byte determine the type of interface, the more significant bits define the logical line number and time-slot number. the following example explains how to program the cm in primary access configuration and how the clock shift works:
peb 2045 pef 2045 semiconductor group 27 time-slot 31 of the synchronous 2048-kbit/s interface logical line 2 shall be switched to the system interface logical line 1 of a 2048-kbit/s system, time-slot 2. the system interface logical output line 1 and the synchronous interface logical input line 2 correspond to the pins out 2 and in 10, respectively ( table 11 ). the programmed instruction sequence on the data bus for that connection reads ( see table 17 and 18 ): 00100001 11111010 00010010 in the same application the instruction sequence 00010001 11111101 00010001 connects the time-slot 31 of the system interface logical line 3 (in 13) to the synchronous interface logical line 0 (out 1) time-slot 2. assuming csr:00 h the frame for input and output lines starts with the rising edge of the sp pulse. the csr entry 11011101 shifts the beginning of the frame for the system interface: the input frame is advanced by 6 data bits because of the shift, but delayed by the 1/2-bit delay facility, resulting in a 5 1/2-bit period advancement. the output frame structure is delayed by 2 data bit periods and one half of a device clock period. figure 15 illustrates these 2 connections for a 4096-khz device clock. figure 15 example connections in the primary access configuration
semiconductor group 28 peb 2045 pef 2045 according to figure 16 in the primary access configuration the connection memory is usually programmed to switch the system and synchronous interface inputs to the synchronous and system interface outputs, respectively. however, it is also possible to connect the system interface inputs to the system interface outputs as well as the synchronous interface inputs to the synchronous interface outputs. this connection possibility allows for test loops at the system and the synchronous interfaces. figure 16 connection choices in the primary access configuration 2.5 space switch mode the space switch mode is selected by the mode bits mi1, mi0, mo1, mo0 = d h . in the space switch mode the basic operational principles differ from those outlined in chapter 2.1 . in the speech memory only a quarter frame is stored restricting the connection capabilities of the pex 2045. all 16 input lines run at a data rate of 8192 kbit/s delivering 2048 bytes of data in each frame. since the speech memory can only hold 512 bytes, the data bytes must be read within a quarter of a frame period to be outputted on one of the two 8192-kbit/s output lines. in space switch mode it is recommended that the sp pulse be 282 t cp8 long (n = 70). for proper functionality the time-slot numbers of a programmed connection must be equal. in the following only this case considered. the output time-slot is encoded in the connection memory address. since the input time-slot has to be the same it is not necessary to fully specify it in the cm data. however the 5 least significant bits must be programmed ( see tables 15 and 16 ). the speech memory address is composed of 4 bits (d0 through d3) for the coding of the 16 input (logical line number and pin names match) lines and 5 bits (d4 through d8) for the coding of 32 time-slots. which of the four blocks of 32 time-slots each is switched to the output lines is determined by the connection memory address. this consists of 1 bit (ia0) for the marking of one of two possible output lines with 7 bits (ia1 through ia7) for the 128 time-slots, as shown below.
peb 2045 pef 2045 semiconductor group 29 the sp signals controls the start of the input and output frame. the output frame starts two t cp8 before the falling sp edge. however, the rising edge marks the beginning of time-slot 125. figure 17 determination of input- and output time-slots in space switch mode the following two examples show how the connection memory is programmed in the space switch mode. input line 10, time-slot 31 ? output line, time-slot 31 00010011 11111010 00111111 input line 10, time-slot 63 ? output line 1, time-slot 63 00010011 11111010 01111111 itd03663 ia0 ia7 block select line output (2 lines) xxxxx output time-slot time-slot input x x x x x d8 d0 = input line 0 31/0 31/0 31/0 95/96 63/64 31/32 pcm in pcm out 0 127 127 31 block 1 block 2 block 3 block 4
semiconductor group 30 peb 2045 pef 2045 3 operational description 3.1 power up upon power up the pex 2045 is set to its initial state. the mode and configuration register bits are all set to logical 1, the clock shift register bits to logical 0. the status register b bit is undefined, the z bit contains logical 0, the r bit is undefined. this state is also reached by pulling the wr and rd signals to logical 0 at the same time (software reset). for the software reset the state of cs is of no significance. 3.2 initialization procedure after power up a few internal signals and clocks need to be initialized. this is done with the initialization sequence. to give all signals and clocks a defined value the mtsc must encounter 3 falling and 2 rising edges of the sp signal. the resulting sp pulses may be of any length allowed in normal operation, the time interval between the two sp pulses may be of any length down to 250 ns. with all signals being defined, the cm needs to be reset. to do that a logical 0 is written into mod:rc. sta:b is set. the resulting cm reset is finished after at most 250 m s and is indicated by the status register b bit being logical 0. changing the pulse shaping factor n during cm reset may result in a cm-reset time longer than 250 m s. to prepare the pex 2045 for programming the cm, the ri bit in the mode register must be reset. note that one mode register access can serve to reset both rc and ri bits as well as configuring to chip (i.e. selecting operating mode etc.). figure 18 initializing the pex 2045 for a 8192-khz device clock
peb 2045 pef 2045 semiconductor group 31 figure 19 initializing the pex 2045 for a 4096-khz device clock 3.3 operation with a 4096-khz device clock in order for the mtsc to operate with a 4096-khz device clock the cps bit in the cfr register needs to be reset. this has to be done before the cm reset and needs up to 1.8 m s. please keep in mind, mod:ri has to be reset prior to performing an indirect register access. for a flow chart of this process refer to figure 19 .
semiconductor group 32 peb 2045 pef 2045 3.4 standby mode with mod:sb being logical 1 the pex 2045 works as a backup device in redundant systems. it can be accessed via the m p interface and works internally like an active device. however, the outputs are high impedance. if the sb bit is reset the outputs are switched to low impedance for the programmed active channels and this mtsc can take over from another device which has been recognized as being faulty. ( see figure 20 ) figure 20 device setup in redundant systems
peb 2045 pef 2045 semiconductor group 33 4 detailed register description the following registers may be accessed: table 8 addressing the direct registers the chapters in this section cover the registers in detail. 4.1 mode register (mod) access: write on address 0 value after power up: ff h rc reset connection memory; writing a zero to this bit causes the complete connection memory to be overwritten with 200 h (tristate). during this time sta:b is set. the maximum time for resetting the connection memory is 250 m s. te tristate enable ; this bit determines which tristating scheme is activated: te = 1: if the speech memory address written into the connection memory is s8 ?s0 = 0, the output channel is tristated. te = 0: the s9 bit written into the connection memory is interpreted as a validity bit: s9 = 0 enables the programmed connection, s9 = 1 tristates the output. note: if te = 1, time-slot 0 of the logical input line 0 cannot be used for switching. ri reset indirect access mechanism; setting this bit resets the indirect access mechanism. ri has to be cleared before writing/reading iar after reset. sb stand by ; by selecting sb = 1 all outputs are tristated. the connection memory works normally. the pex 2045 can be activated immediately by resetting sb. mi1/0 input/output operation mode ; these bits define mo1/0: the bit rate of the input and mo1/0 output lines. the bit rates are given in table 9 , the corresponding pin functions in table 10 (standard configuration) and table 11 (primary multiplex access configuration). address a0 write operation read operation 0 mod sta 1 iar iar db 7 db 0 rc te
semiconductor group 34 peb 2045 pef 2045 table 9 input/output operating modes note: in the mixed modes the first bit rate refers to the odd line numbers, the second one to the even line numbers. mi1 mi0 mo1 mo0 input mode output mode 0 0 0 0 0 0 1 1 1 0 0 1 1 1 0 0 0 1 1 1 0 0 0 0 1 1 0 1 0 0 1 0 0 1 0 0 1 1 1 1 1 0 0 1 0 0 1 0 0 1 0 1 1 1 1 1 16 2 mbit/s 16 2 mbit/s 16 2 mbit/s 4 8 mbit/s 4 8 mbit/s 4 8 mbit/s 2 8 / 8 2 mbit/s 2 8 / 8 2 mbit/s 2 8 / 8 2 mbit/s 8 4 mbit/s 4 8 mbit/s 4 4 / 8 2 mbit/s 8 4 mbit/s 16 8 mbit/s 8 2 mbit/s** 2 8 mbit/s 4 2 / 1 8 mbit/s 8 2 mbit/s 2 8 mbit/s 4 2 / 1 8 mbit/s 8 2 mbit/s 2 8 mbit/s 4 2 / 1 8 mbit/s** 4 4 mbit/s 4 4 mbit/s 4 2 / 2 4 mbit/s** 2 8 mbit/s 2 8 mbit/s* 1 1 1 1 0 1 0 0 unused unused * for space switch application only ** can also be used for primary access configuration
peb 2045 pef 2045 semiconductor group 35 table 10 input and output pin arrangement for the standard configuration input pin arrangement note: the input line numbers shown are the logical line numbers to be used for programming the connection memory. in the case of 16 input lines the logical line numbers are identical to the pin names. output pin arrangement note: the logical output line numbers shown above are identical to the pin names. pin no. 16 8 mbit/s 16 2 mbit/s 4 8 mbit/s 8 2 + 2 8 mbit/s 8 4 mbit/s 8 2 + 4 4 mbit/s p-lcc p-dip 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 in1 in0 in5 in4 in9 in8 in13 in12 in14 in15 in10 in11 in6 in7 in2 in3 in1 in0 in2 in3 in0 in4 in8 in1 in12 in14 in3 in10 in6 in2 in1 in0 in5 in4 in6 in7 in2 in3 in0 in4 in1 in8 in5 in12 in14 in7 in10 in3 in6 in2 pin no. 8 2 mbit/s 2 8 mbit/s 4 2 + 1 8 mbit/s 4 4 mbit/s 4 2 + 2 4 mbit/s p-lcc p-dip 35 36 37 38 40 41 42 43 32 33 34 35 36 37 38 39 out7 out6 out5 out4 out3 out2 out1 out0 out1 out0 out7 out5 out3 out1 out0 out3 out2 out1 out0 out7 out5 out3 out2 out1 out0
semiconductor group 36 peb 2045 pef 2045 table 11 input, output and tristate pin arrangement for the primary access configuration note: the input, output and tristate control line numbers shown in the center columns of this table are logical line numbers. the corresponding pin names are listed in the left most column. pin no. system interface mode pin name p-lcc p-dip 2 mhz 4 mhz 8 mhz tsc0 tsc1 tsc2 tsc3 5 8 10 12 4 6 8 10 tsc0 tsc1 tsc2 tsc3 tsc0 tsc1 tsc0 system interface tristate control signals, clock shift programmable out0 out2 out4 out6 43 41 38 36 39 37 35 33 out0 out1 out2 out3 out0 out1 out0 system interface outputs clock shift programmable in13 in9 in5 in1 11 9 7 4 9 7 5 3 in3 in2 in1 in0 in1 in0 in0 system interface inputs, clock shift programmable out1 out3 out5 out7 42 40 37 35 38 36 34 32 out0 out1 out2 out3 out0 out1 out2 out3 out0 out1 out2 out3 synchronous 2-mhz interface outputs in14 in10 in6 in2 13 15 17 19 11 13 15 17 in3 in2 in1 in0 in3 in2 in1 in0 in3 in2 in1 in0 synchronous 2-mhz interface inputs mode 0000 1111 1010 mi1, mi0, mo1, mo0
peb 2045 pef 2045 semiconductor group 37 4.2 status register (sta) access: read at address 0 b busy: the chip is busy resetting the connection memory (b = 1). b is undefined after power up and logical 0 after the device initialization. note: the maximum time for resetting the connection memory is 250 m s. z incomplete instruction; a three byte indirect instruction is not completed (z = 1). z is 0 after power up. note: z is reset and the indirect access is cancelled by setting mod:ri or resetting mod:rc. r initialization request . the connection memory has to be reset due to loss of data (r = 1). the r bit is set after power failure or inappropriate clocking and reset when the connection memory reset is finished. r is undefined after power up and logical 0 after the device initialization. 4.3 indirect access register (iar) (read or write operation with address a0 = 1) an indirect access is performed by reading/writing three consecutive bytes (first byte = control byte, second byte = data byte, third byte = address byte) to/from iar. the structure is shown in table 12 . table 12 the 3 bytes of the indirect access the control byte bits k1, k0, c1 and c0 together with the address byte determine the type of access being performed according to table 13 . bit 7 bit 0 0 0 k1 k0 0 0 c1 c0 control byte d7 d6 d5 d4 d3 d2 d1 d0 data byte ia7 ia6 ia5 ia4 ia3 ia2 ia1 ia0 address byte db 7 db 0 bz
semiconductor group 38 peb 2045 pef 2045 table 13 encoding the different types of indirect accesses connection memory access for a connection memory access the control byte bits c1 and c0 contain the data bits d9 and d8, respectively. d9 is the validity bit which together with d8 and the data byte d7 ?d0 is written to the cm address ia7 ?ia0. the function of the validity bit is controlled by sta:te. d8 ?d0 and ia7 ?ia0 contain the informa- tion for the logical line and time-slot numbers of the programmed connection, d8 ?d0 for the inputs, ia7 ?ia0 for the outputs. tables 14 through 18 show the programming of these bits for the different configurations and modes. standard configuration table 14 time-slot and line programming for standard configuration k1 k0 c1 c0 address byte type of access 0 1 0 0 0 1 d9 d9 d9 d8 d8 d8 cm address cm address cm address read cm write cm write cm 1 1 1 1 1 1 1 1 0 0 0 0 0 1 0 1 fe h fe h ff h f fh write cfr read cfr write csr read csr standard configuration, all modes except space switch mode 2-mbit/s input lines bit d3 to d0 bit d8 to d4 bit d9 logical line number time-slot number validity bit 4-mbit/s input lines bit d2 to d0 bit d8 to d3 bit d9 logical line number time-slot number validity bit 8-mbit/s input lines bit d1 to d0 bit d8 to d2 bit d9 logical line number time-slot number validity bit 2-mbit/s output lines bit ia2 to ia0 bit ia7 to ia0 line number time-slot number 4-mbit/s output lines bit ia1 to ia0 bit ia7 to ia2 line number time-slot number 8-mbit/s output lines bit ia0 bit ia7 to ia1 line number time-slot number
peb 2045 pef 2045 semiconductor group 39 the pulse shape factor n may take any integer value from 0 to 255. space switch mode table 15 time-slot and line programming for space switch mode n is fixed to 70. the selection of one specific input time-slot is possible by writing the connection memory (cm) as shown below. table 16 programming input and output lines and time-slots in space switch mode in space switch mode the leading edge of the sp pulse must be applied with the first bit of time-slot 125. the input and output time-slot number must match. space switch mode (mi1 = 1, mi0 = 1; mo1 = 0, mo0 = 1) 8-mbit/s input lines bit d0 to d3 bit d4 to d8 bit d9 logical line number the lower 5 bits of the time- slot number validity bit 8-mbit/s output lines bit ia0 bit ia1 to ia7 logical line number time-slot number in cm address 00 ?3f: d8 ?d4 (sm addr.) = ts0 ts3 in cm address 40 ?7f: d8 ?d4 (sm addr.) = ts32 ts63 in cm address 80 ?bf: d8 ?d4 (sm addr.) = ts6 ts95 in cm address c0 ?ff: d8 ?d4 (sm addr.) = ts96 ts127
semiconductor group 40 peb 2045 pef 2045 primary access configuration table 17 time-slot and line programming for the primary access configuration the interface select bits have to be programmed as shown in the following table: table 18 interface selection bits 2-mbit/s input lines bit d1 to d0 bit d3 to d2 bit d8 to d4 bit d9 interface select in line number time-slot number validity bit 4-mbit/s input lines bit d1 to d0 bit d2 bit d8 to d3 bit d9 fixed to 01 (system interface) line number time-slot number validity bit 8-mbit/s input lines bit d1 to d0 bit d8 to d2 bit d9 fixed to 01 (system interface) line number validity bit 2-mbit/s output lines bit ia0 bit ia2 to ia1 bit ia7 to ia3 interface select out line number time-slot number 4-mbit/s output lines bit ia0 bit ia1 bit ia7 to ia2 fixed to 0 (system interface) line number time-slot number 8-mbit/s output lines bit ia0 bit ia7 to ia1 fixed to 0 (system interface) time-slot number system interface synchronous 2-mhz interface input lines 01 10 output lines 0 1
peb 2045 pef 2045 semiconductor group 41 configuration register access (cfr) access: read or write indirect address fe h for a read access the bit 0 of the control byte must be set to logical 1 and for a write access to logical 0. value after power up or software reset: ff h cps clock period select: device clock is set to 8192 khz (logical 1) or 4096 khz (logical 0). cfs configuration select: the pex 2045 works in either the primary access configuration (logical 0) or in standard configuration (logical 1). setting this bit to logical 1 resets the csr to 00 h . clock shift register access (csr) access: read or write at indirect address ff h . for a read access the bit 0 of the control byte has to be set to logical 1 and for a write access to logical 0. the value after power is 00 h . rs2 ?rs0 receive clock shift , bits 2 ?0. the receive data stream is shifted in bit period steps as shown in figure 21 . rre receive with rising edge . the data is sampled with the falling (rre = 0) or rising edge (rre = 1) of the data equivalent clock ( see figure 21 ). xs0 ?xs2 transmit clock shift , bits 2 ?0. the transmitted data stream is shifted as shown in figure 21 . xfe transmit with falling edge ; data is transmitted with the rising (xfe = 0) or falling edge (xfe = 1) of the device clock. data stream manipulation according to these register entries only affects the system interface and only in the primary access configuration. the frame structure can be moved relative to the sp slope by up to 7 clock periods in half clock period steps. this register can hold non-zero values only for a cfr:cfs value of logical 0. figure 21 illustrates the clock shifting facility. db 7 db 0 11 db 7 db 0 rs2 rs1
semiconductor group 42 peb 2045 pef 2045 identical non-zero entries for rs2 ?rs0 and xs2 ?xs0 as well as identical rre and xfe generate an output time-slot structure which is 1 time-slot late relative to the input time-slot structure. identical 000 entries for rs2 ?r0 and xs2 ?xs0 as well as rre and xfe being logical 0 cause the input and output frames to coincide in time. figure 21 clock shifting
peb 2045 pef 2045 semiconductor group 43 5 electrical characteristics absolute maximum ratings dc characteristics ambient temperature under bias range; v dd = 5 v 5 %, v ss = 0 v. capacitances t a = 25 ?c, v dd = 5 v 5 %, v ss = 0 v. parameter symbol limit values unit ambient temperature under bias peb 2045 t a 0 to 70 ?c storage temperature peb 2045 t stg ?65 to 125 ?c ambient temperature under bias pef 2045 t a ?40 to 85 ?c storage temperature pef 2045 t stg ?65 to 125 ?c voltage on any pin with respect to ground v s ?0.4 to v dd + 0.4 v parameter symbol limit values unit test condition min. max. l-input voltage v il ?0.4 0.8 v h-input voltage v ih 2.0 v dd + 0.4 v l-output voltage v ol 0.45 v i ol = 2 ma h-output voltage h-output voltage v oh v oh 2.4 v dd ?0.5 v v i oh = ?400 m a i oh = ?100 m a operational power supply current i cc 10 ma v dd = 5 v, inputs at 0 v or v dd , no output loads input leakage current output leakage current i li i lo 10 m a 0 v < v in < v dd to 0 v 0 v < v out < v dd to 0 v parameter symbol limit values unit min. max. input capacitance c in 10 pf i/o capacitance c io 20 pf output capacitance c out 15 pf
semiconductor group 44 peb 2045 pef 2045 ac characteristics ambient temperature under bias range, v dd = 5 v 5 %. inputs are driven at 2.4 v for a logical 1 and at 0.4 v for a logical 0. timing measurements are made at 2.0 v for a logical 1 and at 0.8 v for a logical 0. the ac testing input/output waveforms are shown below. figure 22 i/o waveform for ac tests m p-interface timing parameter symbol limit values unit min. max. address stable before rd t ar 0ns address hold after rd t ra 0ns rd width t rr 90 ns rd to data valid t rd 90 ns address stable to data valid t ad 90 ns data float after rd t df 525ns read cycle time t rcy 160 ns address stable before wr t aw 0ns address hold time t wa 0ns wr width t ww 60 ns data setup time t dw 5ns data hold time t wd 15 ns write cycle time t wcy 160 ns its00568 = 150 pf load c test under device 2.0 0.8 0.8 2.0 test points
peb 2045 pef 2045 semiconductor group 45 figure 23 m p-read cycle figure 24 m p-write cycle itt00590 data valid t df t rd t rr t ra t ar t rcy db - db7 rd cs t ad itt00591 data valid t wd t dw t ww t wa t aw t wcy db0 - db7 wr cs
semiconductor group 46 peb 2045 pef 2045 pcm-interface timing clock and synchronization timing parameter symbol limit values unit min. max. pcm-input setup t s 0ns pcm-input hold t h 30 ns peb 2045 output delay t d 45 ns pef 2045 output delay t d 50 ns peb 2045 tristate delay t t 55 ns pef 2045 tristate delay t t 60 ns parameter symbol limit values unit min. max. clock period 8 mhz high t cp8 h 40 ns clock period 8 mhz low t cp8 l 48 ns clock period 8 mhz t cp8 120 ns synchronization pulse setup 8 mhz t ss8 10 t cp8 ?20 ns synchronization pulse delay 8 mhz t sh8 0 t cp8 ?20 ns clock period 4 mhz high t cp4 h 90 ns clock period 4 mhz low t cp4 l 90 ns clock period 4 mhz t cp4 240 ns synchronization pulse setup 4 mhz t ss4 10 t cp4 ?30 ns synchronization pulse delay 4 mhz t sh4 30 t cp4 ?10 ns data clock delay t dcd 100 ns
peb 2045 pef 2045 semiconductor group 47 figure 25 pcm-line timing in standard configuration with a 8-mhz device clock itt00592 1020 1021 1022 1023 0 1 2 3 t cp t cp t cp t ss t sh t s t h t d 8h 8 8l 8 ts 31 bit 7 , ts 0 , bit 0 0 bit , 0 ts 1 bit , 0 ts 31 time-slot , bit 7 time-slot 0 , bit 0 n = 255 example with delayed output frame out 2 mbit/s out 2 mbit/s in 2 mbit/s clk sp sp 8 ,6 bit 63 ts h t s t ts 63 bit 7 , ,1 bit 0 ts 0 bit , 0 ts ts 63 bit 6 ,,7 bit 63 ts ts 0 , bit 0 ts 0 bit 1 , d t ts 127 bit 4 5 bit 127 ts 6 bit 127 ts 7 bit 127 ts 0 bit 0 ts 1 bit 2 bit 3 bit t s t h 4 bit 127 ts ts 127 bit 5 ts 127 bit 6 ts127 bit 7 ts 0 ts 0 ts 0 ts 0 bit 0 0 ts bit 1 0 ts bit 2 d t 0 bit 0 ts 1 bit ts 0 2 bit ts 0 ts 0 bit 3 7 bit 0 ts 0 ts bit 6 0 ts bit 5 ts 0 bit 4 0 1 23 24 280 281 space switch application 127 ts bit h t s t ts0 bit 0 7 ts 0 bit 0 0 bit 0 ts ts 127 , bit 7 d t n = 70 fixed in 4 mbit/s out 4 mbit/s in 8 mbit/s out 8 mbit/s out 8 mbit/s sp in 8 mbit/s clk ~ ~ ~ ~ ~ ~ ~ ~
semiconductor group 48 peb 2045 pef 2045 figure 26 pcm-line timing in primary access configuration with a 8 mhz-device clock and a csr entry (00010001) itt00593 1020 1021 1022 1023 0 1 2 3 t ss t sh t s t h t d 8 ts 31 bit 7 , ts 0 , bit 0 ts 0 bit , 0 ts 31 time-slot , bit 6 time-slot 0 , bit 0 2 mbit/s clk sp 8 4 ,7 bit 31 ts h t s t 0 bit , 0 ts ts 0 , bit 0 ts 0 bit 1 , ,7 bit 63 ts ts 63 bit 6 , t s t h bit 3 bit 2 bit 1 bit 0 ts127 bit 7 ts 127 bit 6 ts 127 bit 5 4 bit 127 ts t s t h ts 127 ts 127 ts 127 ts127 31, bit 7 ,1 bit 0 ts 0 bit , 0 ts ts 63 bit 7 , ,6 bit 63 ts d t t d ts 127 bit 4 5 bit 127 ts 6 bit 127 ts 7 bit ts127 127 ts 0 bit 127 ts 1 bit 127 ts 2 bit t d t t 7 bit , 31 ts 0 , bit 0 ts t t ts 63 bit 6 ,,7 bit 63 ts ts 0 , bit 0 ts 0 bit 1 , t t bit 2 ts 127 bit 1 ts 127 bit 0 ts 127 127 ts bit 7 ts 127 bit 6 ts 127 bit 5 t dcd t dcd in in 4 mbit/s in 8 mbit/s in 8 mbit/s 2 mbit/s out 8 mbit/s out 4 mbit/s out 2 mbit/s out tsc 2 mbit/s tsc 4 mbit/s tsc 8 mbit/s synchronous interface in system interface in interface out synchronous system interface out system interface tsc
peb 2045 pef 2045 semiconductor group 49 figure 27 pcm-line timing in standard configuration with a 4-mhz device clock
semiconductor group 50 peb 2045 pef 2045 figure 28 pcm-line timing in primary access configuration with a 4-mhz device clock and a csr entry (00010001)
peb 2045 pef 2045 semiconductor group 51 busy times 6 applications calculation of switching delay for peb 2045 8-mhz clock cycle ( t cl = 122 ns) formula for determining the frame delay: fdel = frame delay (e.g. fdel = 1.5 means 1 frame delay and fdel = 0.8 means 0 frame delay) cdel = component delay = d c min ?( d sp ?2) tsout = time-slot number out clock cycles n = 0 tsin = time-slot number in n = 2 ? d sp = 10 tsdur = time-slot duration = 32 t cl at 2 mbit/s =16 t cl at 4 mbit/s =8 t cl at 8 mbit/s with the above you should be able to calculate the frame delays for all switching possibilities. operation max. value unit indirect register access 900 ns connection memory reset 250 m s output line / pcm mode (mbit/s) 248 even input line odd input line out 0 out 1 out 2 out 3 out 4 0 out 5 1 out 6 2 0 out 7 3 1 64 t cl 60 t cl 56 t cl 52 t cl 48 t cl 44 t cl 40 t cl 36 t cl 80 t cl 76 t cl 72 t cl 68 t cl 64 t cl 60 t cl 56 t cl 52 t cl d c min d c min c del ?(ts out ?ts in) ts dur + 1024 fdel = 1024
peb 2045 pef 2045 semiconductor group 52 7 package outlines plastic package, p-lcc-44 (plastic leaded chip carrier) gpl05102 sorts of packing package outlines for tubes, trays etc. are contained in our data book ?ackage information? dimensions in mm smd = surface mounted device
semiconductor group 53 peb 2045 pef 2045 2.54 1.5 max 0.45 +0.1 1.3 3.7 0.3 0.5 min 5.1 max 40 21 120 50.9 -0.5 0.25 max 0.25 +0.1 14 -0.3 15.24 +1.2 15.24 0.2 index marking ~ ~ 0.25 40x plastic package, p-dip-40 (plastic dual in-line package) gpd05055 sorts of packing package outlines for tubes, trays etc. are contained in our data book ?ackage information? dimensions in mm smd = surface mounted device

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