Intel Xeon L3406 CM80616005010AA User Manual
Product codes
CM80616005010AA
Datasheet, Volume 2
53
Processor Integrated I/O (IIO) Configuration Registers
3.3.4.6
MSICAPID—MSI Capability ID
3.3.4.7
MSINXTPTR—MSI Next Pointer
3.3.4.8
MSICTRL—MSI Control Register
Register:
MSICAPID
Device:
0 (DMI), 3-6 (PCIe)
Function:
0
Offset:
60h
Bit
Attr
Default
Description
7:0
RO
05h
Capability Identifier
Assigned by PCI-SIG for MSI (root ports).
Assigned by PCI-SIG for MSI (root ports).
Register:
MSINXTPTR
Device:
0 (DMI), 3-6 (PCIe)
Function:
0
Offset:
61h
Bit
Attr
Default
Description
7:0
RWO
90h
Next Ptr
This field is set to 90h for the next capability list (PCI Express capability
This field is set to 90h for the next capability list (PCI Express capability
structure) in the chain.
Register:
MSICTRL
Device:
0 (DMI), 3-6 (PCIe)
Function:
0
Offset:
62h
Bit
Attr
Default
Description
15:9
RV
00h
Reserved
8
RO
1
Reserved
7
RO
0
64-bit Address Capable
This field is hardwired to 0h since the message addresses are only 32-bit
This field is hardwired to 0h since the message addresses are only 32-bit
addresses (for example, FEEx_xxxxh).
6:4
RW
000
Multiple Message Enable
Applicable only to PCI Express* ports. Software writes to this field to indicate
Applicable only to PCI Express* ports. Software writes to this field to indicate
the number of allocated messages which is aligned to a power of two. When
MSI is enabled, the software will allocate at least one message to the device. A
value of 000 indicates 1 message. Any value greater than or equal to 001
indicates a message of 2.
3:1
RO
001
Multiple Message Capable
Integrated I/O Express ports support two messages for all their internal
Integrated I/O Express ports support two messages for all their internal
events.
0
RW
0
MSI Enable
The software sets this bit to select platform-specific interrupts or transmit MSI
The software sets this bit to select platform-specific interrupts or transmit MSI
messages.
0 = Disables MSI from being generated.
0 = Disables MSI from being generated.
1 = MSI will be generated when appropriate conditions occur.