CYM1946

The CYM1946 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. The  CYM1946 is 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 (PD0PD3) are used to identify CYM1946's memory density in applications where modules with alternate word depths can be interchanged.