Specifications

76 Product Errata
25759 Rev. 3.79 July 2009
Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors
116 DDR Chip Selects Tristated One Clock Early in Power Down
Mode
Description
When entering DDR Power Down mode with the Power Down Tristate feature enabled, the chip
selects are tristated coincident with the deassertion of the CKE pins, which is a violation of the DDR
specification.
Potential Effect on System
The DRAM enters an invalid state, resulting in unpredictable system operation. This applies only to
Power Down mode when the PwrDwnTriEn bit is set.
Suggested Workaround
Do not enable the Power Down Tristate feature. BIOS should ensure that Dev:2x90[7] remains at the
default value of 0b.
Fix Planned
Yes