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XIO2000 数据表(PDF) 56 Page - Texas Instruments

部件名 XIO2000
功能描述  XIO2000 PCI Express to PCI Bus Translation Bridge
PDF  150 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

XIO2000 数据表(HTML) 56 Page - Texas Instruments

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Classic PCI Configuration Space
44
November 2005
SCPS097B
4.5
Class Code and Revision ID Register
This read-only register categorizes the base class, subclass, and programming interface of the bridge. The
base class is 06h, identifying the device as a bridge. The subclass is 04h, identifying the function as a
PCI-to-PCI bridge, and the programming interface is 00h. Furthermore, the TI device revision is indicated in
the lower byte (02h). See Table 4−4 for a complete description of the register contents.
PCI register offset:
08h
Register type:
Read-only
Default value:
0604 0002h
BIT NUMBER
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
RESET STATE
0
0
0
0
0
1
1
0
0
0
0
0
0
1
0
0
BIT NUMBER
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RESET STATE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
Table 4−4. Class Code and Revision ID Register Description
BIT
FIELD NAME
ACCESS
DESCRIPTION
31:24
BASECLASS
R
Base class. This field returns 06h when read, which classifies the function as a bridge device.
23:16
SUBCLASS
R
Subclass. This field returns 04h when read, which classifies the function as a PCI-to-PCI bridge.
15:8
PGMIF
R
Programming interface. This field returns 00h when read.
7:0
CHIPREV
R
Silicon revision. This field returns the silicon revision of the function.
4.6
Cache Line Size Register
This read/write cache line size register is used by the bridge to determine how much data to prefetch when
handling delayed read transactions. The value in this register must be programmed to a power of 2. Any written
odd value (bit 0 = 1b) or value greater than 32 DWORDs is treated as 0 DWORDs.
PCI register offset:
0Ch
Register type:
Read/Write
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
0
0
0
0
0
0
0
4.7
Primary Latency Timer Register
This read-only register has no meaningful context for a PCI Express device and returns the value 00h when
read.
PCI register offset:
0Dh
Register type:
Read-only
Default value:
00h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
0
0
0
0
0
0
0
4.8
Header Type Register
This read-only register indicates that this function has a type one PCI header. Bit 7 of this register is 0b
indicating that the bridge is a single-function device.
PCI register offset:
0Eh
Register type:
Read-only
Default value:
01h
BIT NUMBER
7
6
5
4
3
2
1
0
RESET STATE
0
0
0
0
0
0
0
1



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