82870P2P64H2 Datasheet, PDF (109/217 Pages) –

Register Description
R
3.5.2
3.5.2.1
3.5.3
BNUM—Bus Number Register
Offset:
01h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
This register should be programmed with the Bus Number of the desired configuration register.
The Status Register should be checked to make sure that there is not a command currently in
progress, before writing to this register. Writing to this register when the ’Busy’ bit in the Status
Register is asserted will have indeterminate effects.
Bits
Description
7:0 Number (NUM). This field indicates the bus number to access.
DFNUM—Device / Function Number Register
Offset:
02h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
This register should be programmed with the Device Number and Function Number of the desired
configuration register. The Status Register should be checked to make sure that there is not a
command currently in progress, before writing to this register. Writing to this register when the
’Busy’ bit in the Status Register is asserted will have indeterminate effects.
Bits
Description
7:3 Device Number (DEV). This field provides the Device number of device to access.
2:0 Function Number (FNC). This field provides the Function number of device to access.
RNUM—Register Number
Offset:
03h
Default Value: 00h
Attribute:
Size:
R/W
8 bits
This register should be programmed with the Register Number of the desired configuration
register. The Status Register should be checked to make sure that there is not a command currently
in progress, before writing to this register. Writing to this register when the ’Busy’ bit in the Status
Register is asserted will have indeterminate effects.
Bits
Description
7:0 Number (NUM). Indicates the register number to access
Intel^® 82870P2 P64H2 Datasheet
109