PPC7A Product Manual
Functional Description
8-19
1
st
Edition
Control and Status Registers
ISA I/O P
ORT
(H
EX
)
D
ESCRIPTION
R
OW
A
0000 to 000F
South Bridge DMA 1 Control
0020 and 0021
South Bridge Interrupt 1 Control
0040 to 0043
South Bridge Counter Control
0060
Keyboard
0061
South Bridge NMI Status and Control
0064
Keyboard
0071 and 0072
RTC
R/W
0078 to 007B
South Bridge BIOS Timer
0080 to 0090
South Bridge DMA Pages
00A0 and 00A1
South Bridge Interrupt 2 Control
00C0 to 00DE
South Bridge DMA 2 Control
02E8 to 02EF
COM6
R/W
02F8 to 02FF
South Bridge COM2
R/W
03E8 to 03EF
COM5
R/W
03F8 to 03FF
South Bridge COM1
R/W
040A
South Bridge DMA Scatter/Gather
RO
040B
DMA 1 Extended Mode
WO
0410 to 043F
South Bridge DMA Scatter/Gather
0481 to 048B
South Bridge DMA High Pages
04D0 and 04D1
South Bridge Edge/Level Control
04D6
DMA 2 Extended Mode
WO
0804
Memory Configuration
RO
0806
Memory Configuration Extend
RO
0808
SCSI Activity LED
R/W
080C
Equipment Present 1
RO
080E
Equipment Present 2
RO
0810
Equipment Present 3
RO
0818
Key Lock
RO
0820
LEDS
R/W
0824
COMs
R/W
0826
RTS
R/W
0828
Reset
R/W
082C
Watchdog Trig
R/W
0854
Board Revision
RO
0858
Extended ID
RO
0864
ID Link
RO
0866
Motherboard Type
RO
0868
FLASH Write control
RO
086E
FLASH Control
R/W
Where:
R/W = Read/Write
RO = Read Only WO = Write Only
The control and status registers exist on the PPC7A
for controlling or reading the status of the hardware.
The addresses are as seen by the processor.
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