Functional Description

This family of secondary cache modules is designed for Intel P54C systems with the 82430NX (Neptune) chipset.
CYM74BP54 is an asynchronous 256-Kbyte cache module that provides a low-cost, high-performance solution with industry standard 5V SRAMs and 3.3V level translators for CPU bus speeds up to 66 MHz. The CYM74BP54 is organized as 32K by 64-bits.
The synchronous modules are available with low-cost synchronous pipelined RAMs or higher performance synchronous burst RAMs. The synchronous pipelined modules are based on a 16Kx64 RAM. The CYM74P54 is a 256-KB module while the CYM74P55 is a 512-KB module. Both are modules without byte parity.
The CYM74SP54 and CYM74SP55 are synchronous burst cache modules that provide zero wait-state performance at a bus speed of 66 MHz. The CYM74SP54 is a 256-Kbyte cache module with byte parity. The CYM74SP55 is a 512-Kbyte cache module with byte parity.
Multiple ground pins and on-board decoupling capacitors ensure high performance with maximum noise immunity.
All components on the cache modules are surface mounted on a multi-layer epoxy laminate (multifunctional) substrate. The contact pins are plated with 150 micro-inches of nickel covered by 10 micro-inches of gold flash.

Features

• Pin-compatible secondary cache module family
• Asynchronous (CYM74BP54), synchronous pipelined (CYM74P54, CYM74P55), or synchronous (CYM74SP54, CYM74SP55) configurations with presence and configuration detect pins
• Ideal for Intel® P54C-based systems with the 82430NX (Neptune) chipset
• Operates at 60 and 66 MHz
• Uses cost-effective CMOS asynchronous SRAMs or high-performance synchronous SRAMs
• 160-position Burndy DIMM CELP2X80SC3Z48 connector
• 3.3V inputs/outputs