AMD 3200 Revision History - Page 40
HyperTransport, Frequency, Changes, Cause, System
UPC - 730143241144
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Revision Guide for AMD Family 15h Models 00h-0Fh Processors 48063 Rev. 3.18 October 2012 602 HyperTransport™ Link Frequency Changes May Cause a System Hang Description A HyperTransport™ link operating at a Gen3 frequency (greater than 2.0 GT/s) may have excessive link retries or may fail to train after transitioning to a new Gen3 frequency. The failure is due to a misconfiguration of the HyperTransport Link Phy Receiver DLL Control and Test 5 Register [DllProcessFreqCtlOverride, DllProcessFreqCtlIndex2] settings (D18F4x1[9C,94,8C,84]_x[5:4][9:0][8,0]F_dm[1] bits 12 and 3:0). These settings are specific to each Gen3 frequency and may be programmed only while the link is operating at a Gen1 frequency (less than or equal to 2.0 GT/s). Potential Effect on System System hang. Suggested Workaround Software that transitions a HyperTransport link between two different Gen3 frequencies must first transition the link to a Gen1 frequency so that the DllProcessFreqCtlOverride and DllProcessFreqCtlIndex2 settings may be programmed according to the algorithm documented in the BIOS and Kernel Developer's Guide (BKDG) for AMD Family 15h Models 00h-0Fh Processors, order# 42301. Fix Planned No fix planned 40 Product Errata