Register map and miscellaneous functions, System i/o map, 8 register map and miscellaneous functions 4.8.1 – Compaq W4000 User Manual
Page 85
Technical Reference Guide
4.8
REGISTER MAP AND MISCELLANEOUS FUNCTIONS
4.8.1
This section contains the system I/O map and information on general-purpose functions of the
ICH2 and I/O controller.
SYSTEM I/O MAP
Table 4-17 lists the fixed addresses of the input/output (I/O) ports.
Table 4-17. System I/O Map
Table 4-17.
System I/O Map
I/O Port
nction
Fu
0000..001F
r 1
h
DMA Controlle
0020..002D
terrupt Controller 1
h
In
002E, 002F
7B367 I/O Controlle
ary)
h
Index, Data Ports to LPC4
r (prim
h Interrupt
Controlle
h Timer
1
h
Index, Dat
h
Timer / Cou
h
Microcontroller, NMI Contro
h RTC
Controller
Cont
Port A, Fast A
Cont
1h
Interrupt Controller 2
3h
APM Control/Status P
00B4..00BDh Interrupt
Controller
00C0..00DFh
DMA Controller 2
00F0h
ister
Coprocessor error reg
0170..0177
if standard I/O space is enabled for primary drive)
h
IDE Controller 2 (active only
01F0..01F7
(active only if standard I/O space is enabled for secondary drive)
h
IDE Controller 1
0278..027F
rallel Port (LPT2)
h
Pa
02E8..02EFh
Serial Port (COM4)
02F8..02FFh
Serial Port (COM2)
0370..0377
skette Drive Controller Secondary Address
h
Di
0030..003D
r
0040..0042
004E, 004F
a Ports to LPC47B367 I/O Controller (secondary)
0050..0052
nter
0060..0067
ller (alternating addresses)
0070..0077
0080..0091h DMA
roller
0092h
20/Reset Generator
0093..009Fh DMA
roller
00A0..00B
00B2h, 00B
orts
0376h
IDE Controller 2 (active only if standard I/O space is enabled for primary drive)
0378..037Fh
Parallel Port (LPT1)
03B0..03DFh Graphics
Controller
03BC..03BEh
Parallel Port (LPT3)
03E8..03EFh
Serial Port (COM3)
03F0..03F5h
Diskette Drive Controller Primary Addresses
03F6h
IDE Controller 1 (active only if standard I/O space is enabled for sec. drive)
03F8..03FFh
Serial Port (COM1)
04D0, 04D1h
Interrupt Controller
0678..067Fh
Parallel Port (LPT2)
0778..077Fh
Parallel Port (LPT1)
07BC..07BEh
Parallel Port (LPT3)
0CF8h
PCI Configuration Address (dword access only )
0CF9h
Reset Control Register
0CFCh
PCI Configuration Data (byte, word, or dword access)
NOTE:
Assume unmarked gaps are unused, reserved, or used by functions that employ variable I/O
address mapping. Some ranges may include reserved addresses.
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
4-31