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Datasheet 55

2.8.9 MC_CRDT_WR_THLD

This is the Memory Controller Write Credit Thresholds register. A Write threshold is

defined as the number of credits reserved for this priority (or higher) request. It is

required that High threshold be greater than or equal to Crit threshold, and that both

be lower than the total Write Credit init value. BIOS must initialize this register with

appropriate values depending on the level of Isoch support in the platform. The new

values take effect immediately upon being written.

• CRIT threshold value must correspond to the number of critical RTIDs reserved at

the IOH.

• HIGH threshold value must correspond to the sum of critical and high RTIDs

reserved at the IOH (which must not exceed 30).

• Set MC_Channel_*_WAQ_PARAMS.ISOCENTRYTHRESHHOLD equal to (31-CRIT).

2.8.10 MC_SCRUBADDR_LO

This register contains part of the address of the last patrol scrub request issued. When

running Memtest, the failing address is logged in this register on Memtest errors.

Software can write the next address to be scrubbed into this register. Patrol scrubs

must be disabled to reliably write this register.

Device: 3

Function: 0

Offset: 74h

Access as a Dword

Bit Type

Reset

Value

Description

12:8 RW 4 HIGH. High Credit Threshold.

4:0 RW 3 CRIT. Critical Credit Threshold.

Device: 3

Function: 0

Offset: 78h

Access as a Dword

Bit Type

Reset

Value

Description

29:14 RW 0 PAGE.

This field contains the row of the last scrub issued. Can be written to specify the

next scrub address with STARTSCRUB in the MC_SCRUB_CONTROL register.

13:0 RW 0 COLUMN.

This field contains the column of the last scrub issued. Can be written to specify

the next scrub address with STARTSCRUB in the MC_SCRUB_CONTROL register.

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Intel i7-2960XM Datenblatt Seite 55