XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 78

• Manufacturer Part Number: XIO2000AI
• Description: PCI Express to PCI Bus Translation Bridge
• Manufacturer: TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]

Classic PCI Configuration Space
4.40 MSI Message Upper Address Register
4.41 MSI Message Data Register
4.42 Capability ID Register
68
15:4
BIT
3:0
SCPS155C
This register contains the upper 32 bits of the address that a MSI message writes to when a serial IRQ is
detected. If this register contains 0000 0000h, then 32-bit addressing is used; otherwise, 64-bit addressing
is used.
This register contains the data that software programmed the bridge to send when it send a MSI message.
See Table 4−23 for a complete description of the register contents.
This read-only register identifies the linked list item as the register for subsystem ID and subsystem vendor
ID capabilities. The register returns 0Dh when read.
RESET STATE
RESET STATE
RESET STATE
RESET STATE
BIT NUMBER
BIT NUMBER
BIT NUMBER
BIT NUMBER
FIELD NAME
MSG_NUM
PCI register offset:
Register type:
Default value:
PCI register offset:
Register type:
Default value:
PCI register offset:
Register type:
Default value:
MSG
ACCESS
31
15
15
0
0
0
7
0
RW
RW
Table 4−23. MSI Message Data Register Description
30
14
14
0
0
0
6
0
System specific message. This field contains the portion of the message that the bridge forwards
unmodified.
Message number. This portion of the message field may be modified to contain the message
number is multiple messages are enable. The number of bits that are modifiable depends on the
number of messages enabled in the message control register.
1 message = No message data bits can be modified (default)
2 messages = Bit 0 can be modified
4 messages = Bits 1:0 can be modified
8 messages = Bits 2:0 can be modified
16 messages = Bits 3:0 can be modified
29
13
13
0
0
0
5
0
68h
Read/Write
0000 0000h
6Ch
Read/Write
0000h
80h
Read-only
0Dh
28
12
12
0
0
0
4
0
27
11
11
0
0
0
3
1
26
10
10
0
0
0
2
1
25
0
9
0
9
0
1
0
24
0
8
0
8
0
DESCRIPTION
0
1
23
0
7
0
7
0
22
0
6
0
6
0
21
0
5
0
5
0
April 2007 Revised October 2008
20
0
4
0
4
0
19
0
3
0
3
0
18
0
2
0
2
0
17
0
1
0
1
0
16
0
0
0
0
0