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.

6.1.5System 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

Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 6-5

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Compaq EX Series, EXS Series manual System Memory Map, Size Memory Address System Function