Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide Publication # 25912 Issue Date: June 2003 Revision: 3.00 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 representations 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 descriptions 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. 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HyperTransport is a licensed trademark of the HyperTransport Technology Consortium. Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies. Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25912 Rev. 3.00 June 2003 Revision History Date June 2003 Revision 3.00 Description Initial public release. Revision History 3 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 4 Revision History 25912 Rev. 3.00 June 2003 AMD Confidential—Advance Information 25912 Rev. 3.00 June 2003 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™ AGP3.0 Graphics Tunnel Revision Guide is to communicate updated product information on the AMD-8151™ HyperTransport™ AGP3.0 graphics tunnel to designers of computer systems 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, provides a detailed description of product errata, including potential effects on system operation and suggested workarounds. An erratum is defined as a deviation from product 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 product errata that cause the AMD-8151 HyperTransport AGP3.0 graphics tunnel to deviate from published specifications. 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 revision guide may be updated periodically. 5 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25912 Rev. 3.00 June 2003 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 6 Sequence Revision DevA:0x08 DevB:0x08 5 B2 13h Revision Determination Preliminary Information 25912 Rev. 3.00 June 2003 AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide Product Errata This section documents AMD-8151™ HyperTransport™ 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” indicates 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 numbers. 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 Product Revision to Errata Revision Number Errata Numbers and Description 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 Product Errata 7 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25912 Rev. 3.00 June 2003 22 Incorrect Value For DevA:0xA4[Host translation#] Description DevA:0xA4[Host translation#] is a read-only bit, fixed in the high state in the graphics tunnel. Per the AGP specification, this indicates that 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 bit is low for the graphics tunnel. Fix Planned No 8 Product Errata Preliminary Information 25912 Rev. 3.00 June 2003 AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 23 Link Electrical Issue When Operating At 800 MHz Description The graphics tunnel A-side 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 restrictive 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 Product Errata 9 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25912 Rev. 3.00 June 2003 24 Deadlock Scenario With Peer-To-Peer Traffic Description Some PCI cards generate peer-to-peer posted-write traffic targeting the AGP bridge (from the PCI bus, through the graphics tunnel, to the host, back 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 10 Product Errata Preliminary Information 25912 Rev. 3.00 June 2003 AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25 Input Leakage Parameter Out Of Spec Description When operating with AGP2.0 signaling, the input leakage current (ILI) is specified to be limited to less than ±10 µA. However, input leakage current may be as much as ±20 µA in some graphics tunnel parts. Potential Effect on System None. Suggested Workaround None required. Fix Planned No Product Errata 11 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 25912 Rev. 3.00 June 2003 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 12 Product Errata Preliminary Information 25912 Rev. 3.00 June 2003 AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 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. Documentation Support 13 Preliminary Information AMD-8151™ HyperTransport™ AGP3.0 Graphics Tunnel Revision Guide 14 Documentation Support 25912 Rev. 3.00 June 2003