FEDS5424331-01

1Semiconductor

This version: Sep. 2000

MSM5424331

222,720-Word

×××× 24-Bit Field Memory

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GENERAL DESCRIPTION

The MSM5424331 is an image data processing field memory organized as 222,720 (768 pixels by 290 lines) by 24

bits that can switch between the FIFO mode where the MSM5424331 is used as an ordinary field memory and a

block access mode where the MSM5424331 can easily exchange data with personal computer and the like.

Serial writing in and serial reading from the MSM5424331 are performed line by line. In the FIFO mode, any line

can be selected by specifying their addresses by the Serial Address input. In the Block Access mode, any line or

word address (10 bits) can be set by entering the address through the address multiplexer.

As the MSM5424331 in the Block Access mode can be controlled by

RAS and CAS signals, it can easily interface

to the MPU.

The MSM5424331 contains dynamic memory cells. In the FIFO mode, the memory cells are automatically

refreshed by the self refresh control circuit, but in the Block Access mode, the memory cells must be refreshed by

the

CAS before RAS Refresh function.

The MSM5424331 is not designed for high end use in such applications as medical systems, professional graphics

systems which require long term picture storage, data storage systems and others.