User`s guide

Table C–4 (Cont.) PC87312 Combination Controller Register Address Space
Map
Address Offset
Read/Write
Physical
Address Register
Parallel Port Registers
3BC-R/W 1 C000 7780 Data register
3BD-R 1 C000 77A0 Status register
3BE-R/W 1 C000 77C0 Control register
3BF 1 C000 77E0 None (tristate bus)
Table C–5 Integrated Device Electronics (IDE) Register Addresses
Address
Offset
Physical
Address Read Function Write Function
1F0 1 C000 3E00 Data Data
1F1 1 C000 3E20 Error Features (write precomp)
1F2 1 C000 3E40 Sector count Sector count
1F3 1 C000 3E60 Sector number Sector number
1F4 1 C000 3E80 Cylinder low Cylinder low
1F5 1 C000 3EA0 Cylinder high Cylinder high
1F6 1 C000 3EC0 Drive/head Drive/head
1F7 1 C000 3EE0 Status Command
3F6 1 C000 7EC0 Alternate status Device control
3F7 1 C000 7EE0 Drive address Not used
C.9 Utility Bus Device Address
Table C–6 shows the decoding for utility bus (Ubus) devices driven from the
SIO bridge.
C–10 PCI Address Maps