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22564B-1—February 2000

AMD-751™ System Controller Revision Guide

Preliminary Information

19

Setting the Queue Bypass-Mode Bit Causes Memory Failure

Products Affected. C5

Description. A memory failure may occur if queue bypass mode is enabled.

Potential Effect on System. Memory failure, which causes a system error.

Suggested Workaround. Do not set the queue bypass-mode bit.

Resolution Status. Fixed in a future revision of the AMD-751.

20

AGP AD_STB[1:0] Strobe Glitch with Nvidia NV10-Based (GeForce) Cards

Products Affected. All revisions (C3 and C5)

Description. The AMD-751 system controller’s AD_STB[1:0] signals may experience noise due to strong

drive strengths. This noise may result in signal glitches, causing incorrect information to be strobed

into the AGP adapter.

Potential Effect on System. System hangs.

Suggested Workaround. The issue can be alleviated by forcing the AGP subsystem into AGP 1X Mode. A

driver update is available from Nvidia that performs this task by changing the system registry.

Performance will decrease when enabling the lower speed AGP mode. To obtain this driver, go to the

www.nvidia.com website, and follow the driver update links from the home page.

Please contact your AMD Specialist for details.

Resolution Status. Fixed in a future revision of the AMD-751 system controller.