156
GTXI User's Guide
I/O Mask Register 1 (IOM1)
Internal address (IA) is 1.
Bit #
15-12
11-0
Function U
IOE23-IOE12
Table D-4: I/O Mask Register 1 Bit Functions
U
Unused
IOE
I/O block enable. ‘0’ - block disabled. ‘1’ - block enabled.
See the table on the next page for bit assignments.
The default value for bits 11-0 is 7Ch.
The following table describes the blocks and bit assignments in the
IOM0 and IOM1 registers:
Address
Range
Purpose Available
to GTXI
platform
Default IOM0
or
IOM1
Bit #
000-0FF CPU
internal
resources
NO N/A
-
-
100-177
YES
CPU 1
0
178-17F GTXI
buffer,
extender
NO N/A
–
–
180-1EF
YES
CPU 1
1
1F0-1FF Hard
Disk
YES
CPU 1
8
200-207 Game
Port
YES
GTXI 1
2
208-237
YES
GTXI 1
3
238-23F Bus
Mouse YES
GTXI 1
4
240-25F
YES
CPU 0
0
260-277
YES
CPU 0
1
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