AMD Sempron 10 Dokumentacja Pobierz pdf (Strona 116)

116 Product Errata

41322 Rev. 3.84 August 2011

Revision Guide for AMD Family 10h Processors

398 HyperTransport™ Links In Retry Mode May Experience High Bit

Error Rate At Specific Link and Northbridge Clock Frequencies

Description

The processor HyperTransport™ link transmit FIFOs may underflow, resulting in bit errors. This

erratum only applies when all of the following conditions are satisfied:

• Links are in retry mode.

• The HyperTransport link clock frequency is greater than the northbridge clock frequency.

• The HyperTransport link clock frequency is an odd multiple of 200 MHz.

• LDTSTOP# has not been asserted since the last warm reset.

Potential Effect on System

The link may fail to train due to multiple bit errors, or experience excessive retries. This behavior

may be intermittent.

Suggested Workaround

At link and northbridge frequency settings where the erratum applies, system software should

subtract 0010b from the four bit value programmed into Link FIFO Read Pointer Optimization

Registers F4x1[9C, 94, 8C, 84]_x[DF, CF][7:4] (XmtRdPtr). If the result of the subtraction is

negative, truncate it to four bits of precision.

Fix Planned

Yes

1 2 ... 111 112 113 114 115 116 117 118 119 120 121 ... 146 147

Brak uwag

AMD Sempron 10 Dokumentacja Strona 116