AMD Sempron 10 Specifications download pdf (Page 140)

140 Product Errata

41322 Rev. 3.84 August 2011

Revision Guide for AMD Family 10h Processors

521 C1E Resume Failure With Certain Registered DIMM

Configurations

Description

Processors may fail to exit self-refresh mode under the following conditions:

• LDTSTOP# is asserted less than 20 uS after it was last deasserted.

• The system configuration includes a processor node having dual or quad rank DDR3 Registered

DIMMs on one channel and only single rank or no DIMMs on the other channel.

• The DRAM Configuration Register[MemClkFreq] (F2x94[2:0]) is 100b (DDR3-667) on the

aforementioned processor node.

• Message-triggered C1E is enabled (Clock Power/Timing Control 0 Register[MTC1eEn],

F3xD4[13] = 1b).

Potential Effect on System

System hang.

Suggested Workaround

System BIOS should program the minimum LDTSTOP# deassertion time to 20 uS. For systems using

a SP5100 southbridge, this is accomplished by setting the southbridge LDTStartTime register

(PM_Reg:88h) = 14h.

Fix Planned

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AMD Sempron 10 Specifications Page 140