Specifications

Product Errata 73
Revision Guide for AMD Family 10h Processors
41322 Rev. 3.84 August 2011
319 Inaccurate Temperature Measurement
Description
The internal thermal sensor used for CurTmp (F3xA4[31:21]), hardware thermal control (HTC),
software thermal control (STC) thermal zone, and the sideband temperature sensor interface (SB-TSI)
may report inconsistent values.
For CPUID Fn0000_0001_EAX[7:4] (Model) 4 and higher, this temperature inconsistency will occur
only on AM2r2, Fr2, Fr5 and Fr6 package processors
Potential Effect on System
HTC, STC thermal zone, and SB-TSI do not provide reliable thermal protection. This does not affect
THERMTRIP or the use of the STC-active state using StcPstateLimit or StcPstateEn (F3x68[30:28,
5]).
Suggested Workaround
None. Platforms that accept AM2r2, Fr2 (1207), Fr5 (1207) or Fr6 (1207) package processors should
be designed with conventional thermal control and throttling methods or utilize PROCHOT_L
functionality based on temperature measurements from an analog thermal diode
(THERMDA/THERMDC). These systems should not rely on the HTC features, STC thermal zone
features, or use SB-TSI.
When (((CPUID Fn8000_0001_EBX[PkgType, bits 31:28] == 1 (AM2r2 or AM3)) &&
(F2x[1, 0]94[Ddr3Mode, bit 8] == 0)) || (CPUID Fn8000_0001_EBX[31:28] == 0 (F (1207)))),
software should not modify HtcTmpLmt (F3x64[22:16]), utilize the value from CurTmp, or enable
any of the STC thermal zone features by setting StcThrottEn, StcApcTmpLoEn, StcApcTmpHiEn,
StcSbcTmpLoEn, or StcSpcTmpHiEn (F3x68[4,3:0]).
Fix Planned
Yes