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Preliminary Information
AMD Athlon™ Processor Model 4 Revision Guide
23614K—October 2003
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Processors with Half-Frequency Multipliers May Hang Upon Wake-up from Disconnect
Products Affected. A4, A5, A6, A7, A9
Normal Specified Operation. The processor should reconnect to the system bus upon wake-up after a
disconnect while in the C2 and C3 ACPI low-power states.
Non-conformance. The processor uses a special circuit to wake up from a low-power state and reconnect
to the system bus when the nominal operating frequency is generated with a half-frequency multiplier.
This circuit is rarely observed to glitch when coming out of the C2 and C3 low-power states.
Potential Effect on System. The system will hang.
Suggested Workaround. Do not use the C2 or C3 ACPI states on processors that run at a nominal operating
frequency generated with a half-frequency multiplier. This can be accomplished by having the BIOS
not declare C2 or C3 support to the operating system in the Fixed ACPI Description Table (FADT).
Resolution Status. Fix planned for a future revision.
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