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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