Memory Expansion - RadiSys EPC-23 Hardware Reference Manual

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Memory Expansion

A single 72-pin SIMM socket is provided for memory expansion. SIMM memory
occupies banks 0 or 1, depending on whether base memory occupies bank 0 or not.
A standard SIMM module is used for memory expansion, or if 0 MBytes of base
memory are present, as primary RAM. Modules meet the following criteria:
- fast page mode
3
- 72-pin
- 80 nanosecond DRAM
- single-sided
- thin double-sided (uses TSOP packaged DRAMs)
Allowable system memory configurations and the specifics of which SIMM to use
are dependent on the system base memory.
The table below specifies the SIMM module used for various configurations with
0 Mbytes of base memory:
Total
Memory
4 MB
8 MB
Table 3. SIMM Organization for 0 MBytes Base Memory.
The table below specifies the SIMM module used for various configurations with
4 MBytes of base memory:
Total
Memory
4 MB
8 MB
12 MB
Table 4. SIMM Organization for 4 MBytes of Base Memory.
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EPC-23 Hardware Reference
SIMM
Memory SIMM organization
4 MB 1 bank 1 MB x 36-bit
8 MB 1 bank 2 MB x 36-bit
SIMM
Memory SIMM organization
None
4 MB 1 bank 1 MB x 36-bit
8 MB 1 bank 2 MB x 36-bit