Hypertransport ™ Link Frequency Changes May Cause A; System Hang - AMD 3200 - Athlon 64 2.0 GHz Processor Manual

Revision Guide for AMD Family h Models h- Fh Processors Rev October
™
HyperTransport Link Frequency Changes May Cause a

System Hang

Description
A HyperTransport ™ link operating at a Gen frequency greater than GT s may have excessive link retries
or may fail to train after transitioning to a new Gen frequency The failure is due to a misconfiguration of the
HyperTransport Link Phy Receiver DLL Control and Test Register DllProcessFreqCtlOverride
DllProcessFreqCtlIndex settings D F x C C x F dm bits and These
settings are specific to each Gen frequency and may be programmed only while the link is operating at a Gen
frequency less than or equal to GT s
Potential Effect on System
System hang
Suggested Workaround
Software that transitions a HyperTransport link between two different Gen frequencies must first transition the
link to a Gen frequency so that the DllProcessFreqCtlOverride and DllProcessFreqCtlIndex settings may be
BIOS and Kernel Developer's Guide BKDG for
programmed according to the algorithm documented in the
AMD Family h Models h- Fh Processors order
Fix Planned
No fix planned
Product Errata