TVME200 User Manual Issue 1.1.0
Page 12 of 26
3.3 VME A24/A32 Memory Enable and Size
If VME memory space is not required, switch S4 to “0” (VME A24/A32 memory disabled).
Figure 3-8 : VME A24/A32 Memory Enable and Size
IndustryPack Memory is mapped into the VME A24 or VME A32 memory space.
In VME A24 memory space, the memory size can be configured from 32 Kbytes to 2 Mbyte memory
per IP slot.
In VME A32 memory space, the memory size is fixed 8 Mbyte per IP slot.
Rotary switch S4 is used to enable/disable VME A24/A32 memory and to select the required VME
memory size. Default setting of S4 is “0”, which signifies VME A24/A32 memory is disabled.
Positions “1” to “7” of S4 represent several memory spaces in VME A24, and with S4 = “F”, each IP
has an 8 Mbyte memory space in VME A32 address space.
The Memory Spaces for all IPs have the same size. If i.e. one IP requires 128 Kbytes of memory,
one IP requires 64 Kbytes of memory and 2 IP require no memory, then S4 must be set to “3”,
which selects a VME A24 memory size of 512 Kbytes, 128 Kbytes memory for each IP.
Value of S4:
VME Memory Size:
0x0
VME A24/A32 memory disabled
0x1
A24
128 Kbytes
32 Kbytes / IP
0x2
A24
256 Kbytes
64 Kbytes / IP
0x3
A24
512 Kbytes
128 Kbytes / IP
0x4
A24
1 Mbytes
256 Kbytes / IP
0x5
A24
2 Mbyte
512 Kbytes / IP
0x6
A24
4 Mbyte
1 Mbyte / IP
0x7
A24
8 Mbyte
2 Mbyte / IP
0x8 – 0xE
reserved
0xF
A32
32 Mbyte
8 Mbyte / IP Slot
Figure 3-9 : VME Memory Size by S4
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