512K x 32 Static RAM Module
946
CYM1946
Features
• High-density 16-megabit SRAM module • 32-bit Standard Footprint supports densities from 16K
x 3...
Description
946
CYM1946
Features
High-density 16-megabit SRAM module 32-bit Standard Footprint supports densities from 16K
x 32 through 1M x 32 High-speed SRAMs
— Access time of 35 ns Low active power
— 7.3W (max.) at 35ns Compatible with CYM1821, CYM1831, CYM1836,
CYM1841, and CYM1851 JDEC Modules
Functional Description
The CYM1946 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. This module is
512K x 32 Static RAM Module
constructed from 16 128K x 8 SRAMs in SOJ packages mounted on an epoxy laminate substrate. Four chip selects are used to independently enable the four bytes. Reading or writing can be executed on individual bytes or any combination of multiple bytes through proper use of selects.
The CYM1946 is designed for use with standard 72-pin SIMM sockets. The pinout is downward compatible with the 64-pin JEDEC ZIP/SIMM module family (CYM1821, CYM1831, CYM1836, and CYM1841). Thus, a single motherboard design can be used to accommodate memory depth ranging from 16K words (CYM1821) to 1,024K words (CYM1851).
Presence detect pins (PD0–PD3) are used to identify module memory density in applications where modules with alternate word depths can be interchanged.
Logic Block Diagram
A0 – A16
OE WE
17
CS1 A17 A18
A0 – A16
1–4 Decoder
17
CS2 A17 A18
1–4 Decoder
A0 – A16 17
CS3
A17 A18
1–4 De-
coder
A0 – A16
17
CS4 A17 A18
1–4 De-
coder
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128Kx8 SRAM
128Kx8 SRAM
128Kx8 SRAM
128Kx8 SRAM
128Kx8 SRAM
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