The MS81V04160A is a single-chip 4Mb FIFO functionally composed of two 2Mb FIFO (First-In First-Out) memories which were designed for 262, 214 x 8-bit high-speed asynchronous read/write operation. The read clocks and the write clocks of each of the 2Mb FIFO memories are connected in common. The MS81V04160A, functionally compatible with 2Mb FIFO memory (MSM51V8222A), can be used as a x16 configuration FIFO. The MS81V04160A is a field memory for wide or low end use in general commodity TVs and VTRs exclusively and is not designed for high end use in professional graphics systems, which require long term picture storage, data storage, medical use and other storage systems. The MS81V04160A provides independent control clocks to support asynchronous read and write operations. Different clock rates are also supported, which allow alternate data rates between write and read data streams. The MS81V04160A provides high speed FIFO (First-in First-out) operation without external refreshing: MS81V04160A refreshes its DRAM storage cells automatically, so that it appears fully static to the users. Moreover, fully static type memory cells and decoders for serial access enable the refresh free serial access operation, so that serial read and/or write control clock can be halted high or low for any duration as long as the power is on. Internal conflicts of memory access and refreshing operations are prevented by special arbitration logic. The MS81V04160A’s function is simple, and similar to a digital delay device whose delay-bit- length is easily set by reset timing. The delay length and the number of read delay clocks between write and read, is determined by externally controlled write and read reset timings. Additional SRAM serial registers, or line buffers for the initial access of 71 x 16-bit enable high speed first-bit-access with no clock delay just after the write or read reset timings.
262, 214 words x 8 bits x 2
Fast FIFO (First-In First-Out) Operation: 25 ns cycle time
Self refresh (No refresh control is required)
High speed asynchronous serial access Read/Write Cycle Time 20 ns/25 ns Access Time 18 ns/23 ns