CARD-PCI/GX Hardware Manual
Rev.A
EPSON
7
1.5 I/O map
The I/O addresses 000h to 0FFh are assigned to the basic I/O. Although the addresses
from 100h to 3FFh are for the ISA bus, SCE8720C has pre-built-in I/O.
These I/O addresses cannot be used when additionally setting I/O. I/O map is as follows:
Table 1.1 I/O map
I/O Address
Register
Function
000h-01Fh
00h RW
DMA Channel 0 Base and Current
Address
01h RW
DMA Channel 0 Base and Current Word
DMA Controller 1
02h RW
DMA Channel 1 Base and Current
Address
(82C37A
equivalent)
03h RW
DMA Channel 1 Base and Current Word
04h RW
DMA Channel 2 Base and Current
Address
05h RW
DMA Channel 2 Base and Current Word
06h RW
DMA Channel 3 Base and Current
Address
07h RW
DMA Channel 3 Base and Current Word
08h WO
Command Resister
08h RO
Status Register
09h WO
Request Register
0Ah WO Single-Mask Register
0Bh WO Mode Register
0Ch WO Clear Byte Pointer
0Dh RO
Master Clear
0Dh WO Temporary Register
0Eh WO Clear Mask Register
0Fh WO Write all Mask Register
020h-021h
20h WO
Initialization Control Word ICW1
20h WO
Operation Control Word OCW2
20h WO
Operation Control Word OCW3
20h RO
Interrupt Service Resister
Interrupt
Controller 1
(82C59A
equivalent)
20h RO
Interrupt Request Resister
21h WO
Initialization Control Word ICW2
21h WO
Initialization Control Word ICW3
21h WO
Initialization Control Word ICW4
21h RW
Operation Control Word OCW1
21h RW
Interrupt Mask Resister
