1260-00C User Manual
Operation 3-5
Table 3-3. 1260-00C CPU Local and A24 Memory Ranges
Installed Memory
Local Address Range
Accessible VXI A24
Address Range
Installed
Memory Size
Start
End
Start
End
512 kilobytes
000000h
07FFFFh
080000h
E7FFFFh
1 Megabyte
000000h
0FFFFFh
100000h
E7FFFFh
2 Megabytes
000000h
1FFFFFh
200000h
E7FFFFh
4 Megabytes
000000h
3FFFFFh
400000h
E7FFFFh
Setting The Shared
Memory Size
To set the amount of installed memory shared with the VXIbus,
change the settings of switches S1 and S2. Table 3-4 gives the
S1 and S2 switch settings for sharing various portions of RAM with
the VXIbus for each possible installed memory configuration.
Table 3-4. Shared Memory Switch Settings
Amount of Installed Memory Shared With VXIbus
Configured
Memory
Size
S1 ON
S2 ON
S1 OFF
S2 ON
S1 ON
S2 OFF
S1 OFF
S2 OFF
512 kilobytes
512 kilobytes
256 kilobytes
128 kilobytes
None
1 Megabyte
1 Megabyte
512 kilobytes
256 kilobytes
None
2 Megabytes
2 Megabytes
1 Megabyte
512 kilobytes
None
4 Megabytes
4 Megabytes
2 Megabytes
1 Megabyte
None
NOTE
The RAM shared with the VXIbus will be the upper portion
of the installed memory.
The 1260-00C Offset Register holds the shared memory VXI A24
base address, as described in the VXIbus specification. The RM
automatically configures the Offset Register at start-up.
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