18 SBC-410 User's Manual
Selecting cache memory size
The SBC-410 features a 2nd level memory cache that supports
128, 256, or 512 KB of cache memory. Higher cache memory
can improve your system's performance.
The cache uses SRAM chips in three sizes: 32 KB, 64 KB and
128 KB. The on-board cache memory banks consists of four
SRAM chip sockets, each of which accepts one "Tag" chip. All
SRAM chips must have a speed of 20 ns or faster. The table below
shows the possible cache configurations:
Cache Configuration
Cache size
Tag RAM
Data RAM
128 KB
one 32 K x 8
four 32 KB x 8 SRAMs
256 KB
one 32 K x 8
four 64 KB x 8 SRAMs
512 KB
one 32 K x 8
four 128 K x 8 SRAMs
Cache memory select (JP11)
When the cache size changes, you must make sure that JP11 is set
to match the new cache memory size. The following chart shows
the proper jumper setting for each cache configuration:
Cache memory select (JP11)
128 KB*
256 KB
512 KB
*default
2 4
1 3
2 4
1 3
2 4
1 3
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