Datasheet

Datasheet, Volume 2 331
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Processor Uncore Configuration Registers
4.2.5 Caching Agent Broadcast Registers (CBo)
4.2.5.1 Cbo_ISOC_Config—Cbo Isochrony Configuration Register
4.2.5.2 Cbo_Coh_Config—Cbo Coherency Configuration Register
Cbo_ISOC_Config
Bus: 1 Device: 12 Function: 7 Offset: 44h
Bit Attr
Reset
Value
Description
31:1 RV 0h Reserved
0RW0h
Isoc_Enable
Enable ISOC mode. This will be used for TOR pipeline to reserve TOR entries for
ISOC.
Cbo_Coh_Config
Bus: 1 Device: 12 Function: 7 Offset: 50h
Bit Attr
Reset
Value
Description
31:24 RV 0h Reserved
23 RW 0b
Disable ISOC RTID Reservation
Disable ISOC RTID Reservation
22 RV 0h Reserved
21 RW 0b
Disable ISOC Egress Reservation
Disable ISOC Egress Reservation
20 RW 0b
Disable ISOC TOR Reservation
Disable TOR ISOC reservation
19 RW 1b
Enable LLC miss message
Enable LLC Miss message
18 RW 1b
Enable IIO BL ring Credit scheme
Enable IIO BL ring Credit scheme
17 RW 1b
EarlyRTIDRelease
Release RTID early for IIO transactions
16 RW 1h
BiasFwdLocalHome
RspFwdIWB when HOME!=Requestor (BiasFwd must be enabled).
15 RW 1h
BiasFwdDoubleData
RspFwdIWB when HOME!=Local (BiasFwd must be enabled)
14 RV 0h Reserved
13 RW 1b
WaitforDataCmp
Wait for Data+Cmp before sending through Cpipe. if 0h, will do it separately.
12 RW 0h
BiasFwd
Enable RspFwdIWB mode, BiasFwdDoubleData & BiasFwdLocalHome are
used for further qualifications. Table below shows the qualifications and behaviors:
BiasFwd BiasFwdDoubleData BiasFwdLocalHome Behaviour for SnpData/Code
with LLC=M
0 x x Original behaviour. No C2C.
Implicit writeback to HA
10 0Fwd only when
Home!=Requestor AND
Home!=Local
10 1Fwd only when
Home!=Requestor
1 1 0 Fwd only when Home!=Local
1 1 1 Fwd for all cases