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comtech aha corporation PRODUCT BRIEF
AHA G709D-40 FEC Core
40 GB/S ITU G.709 REED-SOLOMON DECODER
The G709D-40 core implements the 16 block interleaved RS(255,239) code specified by in Annex A of the ITU G.709 standard. The G709D-40 core is specifically designed to efficiently perform the Reed-Solomon decoding function specified by the standard. The core requires no configuration, no initialization, and no re-synchronization procedure or includes any unnecessary features that would add area, power or complexity to your design. A G709E Reed-Solomon encoder core is also available from AHA.
FEATURES
* ITU G.709 compatible Reed-Solomon core * Input and output data streams are blockinterleaved for seamless connection in G.709 system * 40 Gbits/sec operation in 0.13 CMOS process * 220 Kgates in 0.13 using a typical standard cell library * One-edge, one-clock fully synchronous design without multi-cycle paths * Separate FIFO for increased flexibility and simplified IC floor planning * Complete error reporting for Bit Error Rate calculation and feedback into threshold detection circuits
Figure 1:
AHA G709D-40 FEC
correct_to_zero[10:0] reset clk start received_data[127:0] correct_to_one[10:0] status_valid
AHA G709D-40 FEC
decode_complete uncorrectable[15:0] decoded_data[127:0]
FIFO - 64 Kbit
(available from AHA)
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fifo_data[127:0]
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INPUT SIGNALS
clk - 332 MHz core clock. All inputs are registered on the rising edge. reset - Synchronous reset. received_data[127:0] - Received data bus. Data bus is valid every clock and is registered on the rising edge of clk. The data frame is restarted whenever start is active. The core accepts 8bytes per transfers start - Signal is active to when the first 8 bytes of the G.709 frame in on the received_data bus. Must be inactive on all other data transfers in the frame. Maybe asserted at anytime of the data frame needs to be reset to the first transfer. fifo_data[127:0] - FIFO data. Delay version of the received_data data stream. The bus is registered on the rising edge of clk.
DELIVERABLES
* G.709D-40 FEC core (VHDL) * Timing constraints (DesignCompiler and Ambit format) * Test bench and verification vectors (VHDL) * Single use license to AHA's Reed-Solomon patents
PATENTS
Design uses one or more of the following US Patents: 5,170,399; 5,099,482; 4,873,688; 5,396,502
ABOUT AHA
Comtech AHA Corporation (AHA) develops and markets superior integrated circuits, boards, and intellectual property core technology for communications systems architects worldwide. AHA has been setting the standard in Forward Error Correction and Lossless Data Compression technology for many years and provides flexible, cost-effective solutions for today's growing bandwidth and reliability challenges. Comtech AHA Corporation is a wholly owned subsidiary of Comtech Telecommuncations Corp. (NASDAQ: CMTL). For more information, visit www.aha.com.
OUTPUT SIGNALS
decode_complete - Decoding complete. Active when the first 8-byte transfer of the G.709 frame is on the decode_data data bus and inactive on all subsequent transfers. decoded_data[127:0] - Decoded data. The first 8bytes of the corrected G.709 frame are valid when decode_complete is active and the remainder of the frame is available over the subsequent 509 clocks. The data is driven from the rising edge of clk. status_valid - Status valid signal. Active for a single clk following the completion of the frame to indicate when the uncorrectable, correct-to-zero, and correct_to_one signals are valid. uncorrectable[15:0] - Uncorrectable block flags. Each bit of the signal corresponds to one of the 16 Reed-Solomon blocks in the G.709 frame. Valid when status_valid is active. correct_to_zero[10:0] - Number of bits corrected from `1' to `0' in the just completed G.709 frame. Signal is valid when status_valid is active. correct_to_one[10:0] - Number of bits corrected from `0' to `1' in the just completed G.709 frame. Signal is valid when status_valid is active.
comtech aha corporation
A subsidiary of Comtech Telecommunications Corporation
1126 Alturas Drive Moscow, ID 83843-8331 tel: 208.892.5600 fax: 208.892.5601 e-mail: sales@aha.com www.aha.com
PBG709D40_0203
(c) 2005 Comtech AHA Corp.

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