Intel B940 Datasheet Page 281

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Datasheet, Volume 2 281
Processor Configuration Registers
2.18.24 IEDATA_REG—Invalidation Completion Event Data
Register
This register specifies the Invalidation Event interrupt message data. The register is
treated as reserved by implementations reporting Queued Invalidation (QI) as not
supported in the Extended Capability register.
2.18.25 IEUADDR_REG—Invalidation Completion Event Upper
Address Register
This register specifies the Invalidation Event interrupt message upper address. The
register is treated as reserved by implementations reporting both Queued Invalidation
(QI) and Extended Interrupt Mode (EIM) as not supported in the Extended Capability
register.
B/D/F/Type: 0/2/0/GFXVTBAR
Address Offset: A4–A7h
Reset Value: 0000_0000h
Access: RO
Bit Attr
Reset
Value
Description
31:16 RO 0000h
Extended Interrupt Message Data (EIMD)
This field is valid only for implementations supporting 32-bit interrupt data
fields.
Hardware implementations supporting only 16-bit interrupt data treat this
field as reserved.
15:0 RO 0000h
Interrupt Message Data (IMD)
Data value in the interrupt request. Software requirements for programming
this register are described in the VTd specification.
B/D/F/Type: 0/2/0/GFXVTBAR
Address Offset: AC–AFh
Reset Value: 0000_0000h
Access: RO
Bit Attr
Reset
Value
Description
31:0 RO
0000_000
0h
Message Upper Address (MUA)
Hardware implementations supporting Queued Invalidations and Extended
Interrupt Mode are required to implement this register.
Software requirements for programming this register are described in the
VTd specification.
Hardware implementations not supporting Queued Invalidations and
Extended Interrupt Mode may treat this field as reserved.
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