Chapter 2
8
2.5.1
UPGRADING CACHE
The mainboard is available with an optional 256KB, 512KB, or 1MB cache
memory on-board. User can upgrade cache memory by installing additional
SRAM (Static Random Access Memory) chips in sockets U10-U17; U9.
The speed of the SRAM chips needed depends on the clock speed of the
microprocessor:
75,90,100,120,133MHz CPU requires 15ns (tag and data) SRAM chips.
2.5.2
CACHE SIZE AND MEMORY LOCATIONS
The table on following page describes the chip capacity and socket location
required for each cache size configuration. User can use 32Kx8-bit,
64Kx8-bit, or 128Kx8-bit SRAM chips in the Data RAM sockets, and
8Kx8-bit, 16Kx8-bit or 32Kx8-bit SRAM chips in the Tag RAM socket.
DATA RAM
TAG RAM
Cache Size
U10 - U17
U9
256K
32Kx8
8Kx8/16Kx8
512K
64Kx8
16Kx8/32Kx8
1M
128Kx8
32Kx8
Table 3: Cache Size Configuration