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54 Datasheet

2.8.8 MC_RD_CRDT_INIT

These registers contain the initial read credits available for issuing memory reads. TAD

read credit counters are loaded with the corresponding values at reset and anytime this

on the level of Isoch support in the platform. It is invalid to write this register while TAD

is active (has memory requests outstanding), as the write will break TAD's outstanding

credit count values.

• Total read credits (CRDT_RD + CRDT_RD_HIGH + CRDT_RD_CRIT) must not

exceed 31.

• CRDT_RD_HIGH value must correspond to the number of high RTIDs reserved at

the IOH.

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

the IOH.

• CRDT_RD_HIGH + CRDT_RD must be less than or equal to 13.

• CRDT_RD_HIGH + CRDT_RD_CRIT must be less than or equal to 8.

• CRDT_RD_CRIT must be less than or equal to 6. Set CRDT_RD to (16 -

CRDT_RD_CRIT - CRDT_RD_HIGH).

• If (Mirroring OR Sparing enabled) then Max for CRDT_RD is 14, otherwise it is 15.

• If (Isoch not enabled) then CRDT_RD_HIGH and CRDT_RD_CRIT are set to 0.

Device: 3

Function: 0

Offset: 70h

Access as a Dword

Bit Type

Reset

Value

Description

20:16 RW 3 CRDT_RD_CRIT. Critical Read Credits.

12:8 RW 1 CRDT_RD_HIGH. High Read Credits.

4:0 RW 13 CRDT_RD. Normal Read Credits.

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Intel i7-2960XM Datenblatt Seite 54