XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 49

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

3.8
April 2007 Revised October 2008
Byte 12>
Byte 12>
Byte 12>
Byte 0>
Byte 0>
Byte 4>
Byte 4>
Byte 8>
Byte 0>
Byte 0>
Byte 4>
Byte 4>
Byte 8>
Byte 0>
Byte 0>
Byte 4>
Byte 4>
Byte 8>
PME Conversion to PCI Express Messages
When the PCI bus PME input transitions low, the bridge generates and sends a PCI Express PME message
upstream. The requester ID portion of the PME message uses the stored value in the secondary bus number
register as the bus number, 0 as the device number, and 0 as the function number. The Tag field for each PME
message is 00h. A PME message is sent periodically until the PME signal transitions high.
Figure 3−10 illustrates the format for a PCI Express PME message.
R
R
R
R
R
R
7
7
7
6
0
6
0
6
0
Fmt
Fmt
Fmt
5
1
5
1
5
1
4
1
4
1
4
1
+0
+0
+0
3
0
3
0
3
0
Type
Type
Type
2
1
2
1
2
0
Figure 3−9. PCI Express DEASSERT_INTX Message
Requester ID
Requester ID
Requester ID
Requester ID
Requester ID
Requester ID
1
0
1
0
1
0
Figure 3−8. PCI Express ASSERT_INTX Message
Table 3−12. Interrupt Mapping In The Code Field
0
0
0
0
0
0
Figure 3−10. PCI Express PME Message
R
R
R
R
R
R
7
7
7
6
0
6
0
6
0
TC
TC
TC
INTERRUPT
5
0
5
0
5
0
INTB
INTC
INTD
INTA
4
0
4
0
4
0
+1
+1
+1
3
3
3
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
2
2
2
CODE FIELD
1
1
1
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
0
0
0
00
01
10
11
D
D
D
7
T
7
T
7
T
6
E
P
6
E
P
6
E
P
5
0
5
0
5
0
Attr
Attr
Attr
4
0
4
0
4
0
Tag
Tag
Tag
Tag
Tag
Tag
+2
+2
+2
3
3
3
R
R
R
R
R
R
2
2
2
1
0
1
0
1
0
0
0
0
0
0
0
Feature/Protocol Descriptions
7
0
0
7
0
0
7
0
0
6
0
0
6
0
0
6
0
0
Length
Length
Length
5
0
1
5
0
1
5
0
0
SCPS155C
Code
Code
Code
4
0
0
4
0
0
4
0
1
+3
+3
+3
3
0
0
3
0
0
3
0
1
2
0
0
2
0
1
2
0
0
1
0
x
1
0
x
1
0
0
0
0
x
0
0
x
0
0
0
39