Intel B940 Datasheet Page 207

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Datasheet, Volume 2 207
Processor Configuration Registers
2.15.20 IQT_REG—Invalidation Queue Tail Register
Register indicating the invalidation tail head. This register is treated as reserved by
implementations reporting Queued Invalidation (QI) as not supported in the Extended
Capability register.
2.15.21 IQA_REG—Invalidation Queue Address Register
Register to configure the base address and size of the invalidation queue. This register
is treated as reserved by implementations reporting Queued Invalidation (QI) as not
supported in the Extended Capability register. When supported, writing to this register
causes the Invalidation Queue Head and Invalidation Queue Tail registers to be reset to
0h.
B/D/F/Type: 0/0/0/VC0PREMAP
Address Offset: 88–8Fh
Reset Value: 0000000000000000h
Access: RO
Bit Attr
Reset
Value
Description
63:19 RO
00000000
0000h
Reserved
18:4 RO 0000h
Queue Tail (QT)
This field specifies the offset (128-bit aligned) to the invalidation queue for
the command that will be written next by software.
3:0 RO 0h Reserved
B/D/F/Type: 0/0/0/VC0PREMAP
Address Offset: 90–97h
Reset Value: 0000000000000000h
Access: RW, RO
Bit Attr
Reset
Value
Description
63:12 RW
00000000
00000h
Invalidation Queue Base Address (IQA)
This field points to the base of 4 KB aligned invalidation request queue.
Hardware ignores and not implement bits 63:HAW,where HAW is the host
address width. Reads of this field return the value that was last programmed
to it.
11:3 RO 000h Reserved
2:0 RW 0h
Queue Size (QS)
This field specifies the size of the invalidation request queue. A value of X in
this field indicates an invalidation request queue of (X+1) 4 KB pages. The
number of entries in the invalidation queue is 2(X + 8).
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