MSM5424331 Datasheet | OKI Electric

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 puter 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. 1/34 .. FEDS5424331-01 1 Semiconductor FEATURES - Switching between FIFO and Block Access modes by the D/F pin FIFO mode: Serial write/read operation by line-by-line accessing Block Access mode: Fast write/read operation on an 8-word basis by the RAS and CAS control - Organization of 768 × 290 × 24 bits FIFO mode: Input × 12 or × 24 controlled by L/UWE Output × 24 Block Access mode: Input × 12 (Two 768 × 290 × 12-bit banks are controlled by L/UWE.) Output × 12 (Two 768 × 290 × 12-bit banks are controlled by A9.) - Asynchronous operation Input and output asynchronous operation enabled only in the FIFO mode Single write or read operation in the Block Access mode - Serial Read and Write Cycle times (in both the FIFO mode and the Block Access mode) Cycle time: 60 ns...