XIO2000AI TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS], XIO2000AI Datasheet - Page 64

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

Classic PCI Configuration Space
4.9
4.10 Device Control Base Address Register
4.11 Primary Bus Number Register
54
31:12
11:4
BIT
2:1
3
0
SCPS155C
BIST Register
Since the bridge does not support a built-in self test (BIST), this read-only register returns the value of 00h
when read.
This register programs the memory base address that acesses the device control registers. By default, this
register is read only. If bit 5 of the Control and Diagnostic Register 2 (offset C8h) is set, then the bits 31:12
of this register become read/write. See Table 4−5 for a complete description of the register contents.
This read/write register specifies the bus number of the PCI bus segment that the PCI Express interface is
connected to.
RESET STATE
RESET STATE
RESET STATE
RESET STATE
BIT NUMBER
BIT NUMBER
BIT NUMBER
BIT NUMBER
FIELD NAME
PRE_FETCH
MEM_TYPE
ADDRESS
MEM_IND
PCI register offset:
Register type:
Default value:
PCI register offset:
Register type:
Default value:
PCI register offset:
Register type:
Default value:
RSVD
Table 4−5. Device Control Base Address Register Description
ACCESS
R,R/W
31
15
0
0
7
0
7
0
R
R
R
R
30
14
0
0
6
0
6
0
Memory base address. The memory address field for the bridge uses 20 read/write bits indicating
that 4096 bytes is the amount of memory space that is reserved. These bits are read only if
Register C8h bit 5 is clear. If bit 5 is set, then these bits become Read/Write.
Reserved. These bits are read-only and return 00h when read.
Prefetchable. This bit is read-only 0b indicating that this memory window is not prefetchable.
Memory type. This field is read-only 00b indicating that this window can be located anywhere in the
32-bit address space.
Memory space indicator. This field returns 0b indicating that memory space is used.
29
13
0
0
5
0
5
0
0Fh
Read-only
00h
10h
Read-only, Read/Write
0000 0000h
18h
Read/Write
00h
28
12
0
0
4
0
4
0
27
11
0
0
3
0
3
0
26
10
0
0
2
0
2
0
25
0
9
0
1
0
1
0
24
0
8
0
DESCRIPTION
0
0
0
0
23
0
7
0
22
0
6
0
21
0
5
0
April 2007 Revised October 2008
20
0
4
0
19
0
3
0
18
0
2
0
17
0
1
0
16
0
0
0