A-1
Appendix A – DRAM Installation
The XVME-655 has two single 72-pin in-line memory module (SIMM) sites in which to
add memory. Due to CPU speed, DRAM access time should be 70 ns or less, and must
be 60 ns to run with zero wait states. Both SIMMs must be populated to provide a 64-bit
memory interface.
The XVME-655 can accommodate 8, 16, 32, or 64 Mbytes of DRAM. You can use 1Mx
32, 2M x 32, or 8M x 32 DRAM SIMM sizes. Lists the combinations needed for the four
memory configurations. (The “U” number is silk screened on the front of the board.)
Table Appendix A-1. DRAM SIMM Module Combinations
Memory
SIMM Site U34
SIMM Site U35
8 Mbytes
1M x 32
1M x 32
16 Mbytes
2M x 32
2M x 32
32 Mbytes
4M x 32
4M x 32
64 Mbytes
8M x 32
8M x 32
For other memory configurations, contact Xycom’s Application Engineering
Department.
Tables A-2 through A-5 list recommended DRAM manufacturers, along with the part
numbers.
Table Appendix A-2. 1M x 32 Part Numbers
Part Number
Manufacturer
Non-EDO
EDO
Micron
MT8D132M-6
MT8D132M-6x
Xycom
104273
Table Appendix A-3. 2M x 32 Part Numbers
Part Number
Manufacturer
Non-EDO
EDO
Micron
MT6D232M-6
MT6D232M-6x
Xycom
104258
Table Appendix A-4. 4M x 32 Part Numbers
Part Number
Manufacturer
Non-EDO
EDO
Micron
MT8D432M-6
MT8D432M-6x
Xycom
104302
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