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preliminary information AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide 25912 publication # 3.00 revision: june 2003 issue date:
preliminary information ? 2003 advanced micro devices, inc. all rights reserved. the contents of this document are provided in connection with advanced micro devices, inc. (?amd?) products. amd makes no represen tations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descrip tions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. excep t as set forth in amd?s standard terms and conditions of sale, amd assu mes no liability whatsoever, an d disclaims any express or implied warranty, relating to its products including, but no t limited to, the implied warranty of merchantability, fitness for a particular purpos e, or infringement of any intellectual prop- erty right. amd?s products are not designed, intended, au thorized or warrante d for use as compo- nents in systems intended for surgical implant into the bo dy, or in other applications intended to support or sustai n life, or in any other application in which the failure of amd?s product could create a situation where pers onal injury, death, or severe property or environmental damage may occur. amd reserves the right to discontinue or make changes to its products at any time without notice. trademarks amd, the amd arrow logo, and combinations thereof, a nd AMD-8151 are trademarks of advanced micro devices, inc. hypertransport is a licensed trademark of the hypertransport technology consortium. other product names used in this publicati on are for identification purposes only and ma y be trademarks of their respective com panies.
revision history 3 preliminary information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide 25912 rev. 3.00 june 2003 revision history date revision description june 2003 3.00 initial public release.
4 revision history preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide
5 25912 rev. 3.00 june 2003 amd confidential?advance information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide the purpose of the AMD-8151? hypertransport? agp 3.0 graphics tunnel revision guide is to communicate updated produc t information on the AMD-8151? hype rtransport? agp3.0 graphics tunnel to designers of computer sy stems and software developers. this guide consists of three major sections: revision determination: this section, which starts on page 6, describes the mechanism by which the current revision of the part is identified. product errata: this section, which starts on page 7, pr ovides a detailed description of product errata, including potential effect s on system operation and suggested workarounds. an erratum is defined as a deviation from produc t specifications, and as such may cause the behavior of the AMD-8151 hypertransport agp3.0 graphics tunnel to deviate from the published specifications. documentation support: this section, which starts on page 13, provides a listing of available technical support resources. revision guide policy occasionally, amd identifies pr oduct errata that cause the AMD-8151 hypertransport agp3.0 graphics tunnel to deviate from published specificat ions. descriptions of identified product errata are designed to assist system and software designers in using the AMD-8151 hypertransport agp3.0 graphics tunnel. furthermore, this re vision guide may be updated periodically.
6 revision determination preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide revision determination the bios checks the pci revision id register at deva:0x08 to determine the version of silicon as shown in table 1. table 1. AMD-8151? hypertransport? agp3.0 graphics tunnel revision ids sequence revision deva:0x08 devb:0x08 5b2 13h
product errata 7 preliminary information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide 25912 rev. 3.00 june 2003 product errata this section documents AMD-8151? hypertranspor t? agp3.0 graphics tunnel product errata. a unique tracking number for each erratum has been assigned within this document for user convenience in tracking the errata within specific revision levels. table 2 cross-references the revisions of the part to each erratum. an ?x? i ndicates that the erratum applies to the revision. the absence of an ?x? indicates that the erratum does not apply to the revision. note: there may be missing errata numbe rs. errata that have been resolved from early revisions of the device have been deleted, and errata that have been reconsidered may have been deleted or renumbered. table 2. cross-reference of pr oduct revision to errata errata numbers and description revision number b2 22 incorrect value for deva:0xa4[host translation#] x 23 link electrical issue when operating at 800 mhz x 24 deadlock scenario with peer-to-peer traffic x 25 input leakage parameter out of spec x 26 devb:0x00[devid] is read only x
8 product errata preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide 22 incorrect value for deva :0xa4[host translation#] description deva:0xa4[host translation#] is a r ead-only bit, fixed in the high stat e in the graphics tunnel. per the agp specification, this indicates th at core logic does not translate host transactions addressed to the graphics aperature through the gart. however, on amd platforms that use the graphics tunnel, such host transactions can be translated through the gart. potential effect on system none. suggested workaround software should presume that this bi t is low for the graphics tunnel. fix planned no
product errata 9 preliminary information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide 25912 rev. 3.00 june 2003 23 link electrical issue wh en operating at 800 mhz description the graphics tunnel a-si de link may not operate properly at 800 mhz. potential effect on system transfer of erroneous data and system deadlocks are possible. suggested workaround the a-side link should be configured to operate at 600 mhz instead of 800 mhz. alternatively, more restri ctive system board layout rules for the a-side link may be employed. see the AMD-8151? hypertransport? agp3.0 graphics tunnel motherboard design guide, order# 25617 for details. fix planned no
10 product errata preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide 24 deadlock scenario with peer-to-peer traffic description some pci cards generate peer-to- peer posted-write traffic targeti ng the agp bridge (from the pci bus, through the graphics tunnel, to the host, b ack to the graphics tunnel to the agp bus). the combination of such cards and some agp cards can generate traffic patterns that result in a system deadlock. potential effect on system the system deadlocks. suggested workaround do not support pci cards that generate peer-to-peer traffic to the agp bridge. fix planned no
product errata 11 preliminary information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide 25912 rev. 3.00 june 2003 25 input leakage parameter out of spec description when operating with agp2.0 signaling, the input leakage current (i li ) is specified to be limited to less than 10 a. however, input leakage cu rrent may be as much as 20 a in some graphics tunnel parts. potential effect on system none. suggested workaround none required. fix planned no
12 product errata preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide 26 devb:0x00[devid] is read only description the four lsbs of devb:0x00[devid] should be "write once". however, they are "read only" instead. potential effect on system a generic graphics driver may be loaded even if the platform does not support the generic driver. suggested workaround none required. fix planned no
documentation support 13 preliminary information AMD-8151? hypertransport ? agp3.0 graphics tunnel revision guide 25912 rev. 3.00 june 2003 documentation support the following documents provide additional information regarding the operation of the AMD-8151? hypertransport? agp3.0 graphics tunnel: AMD-8151? hypertransport? agp3.0 graphics tunnel data sheet , order# 24888 hypertransport? i/o link specification (www.hypertransport.org) see the amd web site at www.amd.com for the latest updates to documents. for documents subject to a non-disclosure agreement, please contact your local sales representative.
14 documentation support preliminary information 25912 rev. 3.00 june 2003 AMD-8151? hypertransport? agp3.0 graphics tunnel revision guide

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