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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

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AMD Sempron 10 Specifiche Pagina 73