PCI1451 Datasheet, PDF (63/141 Pages) Texas Instruments – PC Card Controller

4.15 PCI Bus Number Register
The PCI bus number register is programmed by the host system to indicate the bus number of the PCI bus to which
the PCI1451 is connected. The PCI1451 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
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
PCI bus number
Read/Write
18h (Functions 0, 1)
00h
4.16 CardBus Bus Number Register
The CardBus bus number register is programmed by the host system to indicate the bus number of the CardBus bus
to which the PCI1451 is connected. The PCI1451 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 PCI1451 controller function.
Bit
7
6
5
4
3
2
1
0
Name
CardBus bus number
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
CardBus bus number
Read/Write
19h
00h
4.17 Subordinate Bus Number Register
The subordinate bus number register is programmed by the host system to indicate the highest numbered bus below
the CardBus bus. The PCI1451 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
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
0
0
0
0
0
0
0
0
Register:
Type:
Offset:
Default:
Subordinate bus number
Read/Write
1Ah
00h
4–9