Setting The Shared Memory Size; Table 3-3, 1260-00C Cpu Local And A24 Memory Ranges; Table 3-4, Shared Memory Switch Settings - Racal Instruments 1260-00C User Manual

1260-00C User Manual
Table 3-3. 1260-00C CPU Local and A24 Memory Ranges
Installed
Memory Size
512 kilobytes
1 Megabyte
2 Megabytes
4 Megabytes
Setting The Shared
Memory Size
Configured
Memory
Size
512 kilobytes 512 kilobytes
1 Megabyte 1 Megabyte
2 Megabytes 2 Megabytes
4 Megabytes 4 Megabytes
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Installed Memory
Local Address Range
Start End
000000h 07FFFFh
000000h 0FFFFFh
000000h 1FFFFFh
000000h 3FFFFFh
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
S1 ON S1 OFF
S2 ON S2 ON
256 kilobytes
512 kilobytes
1 Megabyte
2 Megabytes
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.
Accessible VXI A24
Address Range
Start
080000h E7FFFFh
100000h E7FFFFh
200000h E7FFFFh
400000h E7FFFFh
S1 ON S1 OFF
S2 OFF S2 OFF
128 kilobytes
256 kilobytes
512 kilobytes
1 Megabyte
NOTE
Operation 3-5
End
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