Compaq Deskpro EN Series of Personal Computers
6-5
ICH Fixed I/O Registers cont
Port
Register Name
1F0h-1F7h
PIO Mode Command Block Offset for Primary Drive
376h
PIO Mode Control Block Offset for Secondary Drive
3F6h
PIO Mode Control Block Offset for Primary Drive
4D0h
Master PIC Edge/Level Triggered Register
3F6h
PIO Mode Control Block Offset for Primary Drive
4D0h
Master PIC Edge/Level Triggered Register
4D1h
Slave PIC Edge/Level Triggered Register
400-47F
Super I/O
F800-F87F
Reserved (power management)
FA00-FA3F
Reserved (GPIO management)
FC00-FC0F
Reserved (SMBUS controller)
NOTE:
When the POS_DEC_EN bit is set, additional I/O ports get positively
decoded by the ICH.
6.1.5
System Memory Map
Size
Memory Address
System Function
512 KB
FFFFFFFFh to FFF80000
System ROM
3839 MB
FFFBFFFFh to 10000000h
PCI Memory Expansion
511 MB
0FFFFFFFh to 00100000h
HOST or PCI Memory Expansion
128KB
000FFFFFh to 000E0000h
System ROM
96 KB
000DFFFFh to 000C8000h
PCI Option ROMs
32 KB
000C7FFFh to 000C0000h
Video ROM
128 KB
000BFFFFh to 000A0000h
Video RAM
640 KB
0009FFFFh to 00000000h
Base Memory