參數(shù)資料
型號(hào)： PCI1520I
廠商： Texas Instruments, Inc.
英文描述： PC CARD CONTROLLERS
中文描述： PC卡控制器
文件頁數(shù)： 71/138頁
文件大?。?/td> 745K
代理商： PCI1520I
49
4.15 PCI Bus Number Register
This register is programmed by the host system to indicate the bus number of the PCI bus to which the PCI1520 is
connected. The PCI1520 uses this register in conjunction with the CardBus bus number and subordinate bus number
registers to determine when to forward PCI configuration cycles to its secondary buses.
Bit
7
6
5
4
3
2
1
0
Name
PCI bus number
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
PCI bus number
18h (functions 0, 1)
Read/Write
00h
4.16 CardBus Bus Number Register
This register is programmed by the host system to indicate the bus number of the CardBus bus to which the PCI1520
is connected. The PCI1520 uses this register in conjunction with the PCI bus number and subordinate bus number
registers to determine when to forward PCI configuration cycles to its secondary buses. This register is separate for
each PCI1520 controller function.
Bit
7
6
5
4
3
2
1
0
Name
CardBus bus number
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
CardBus bus number
19h
Read/Write
00h
4.17 Subordinate Bus Number Register
This register is programmed by the host system to indicate the highest-numbered bus below the CardBus bus. The
PCI1520 uses this register in conjunction with the PCI bus number and CardBus bus number registers to determine
when to forward PCI configuration cycles to its secondary buses. This register is separate for each CardBus controller
function.
Bit
7
6
5
4
3
2
1
0
Name
Subordinate bus number
Type
RW
RW
RW
RW
RW
RW
RW
RW
Default
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
Subordinate bus number
1Ah
Read/Write
00h
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