OKI Semiconductor
MS81V04160
Dual FIFO (262,214-word x 8-Bits) x 2
REVISION1 1999.4.15
GENERAL DESCRIPTION
The MS81V04160 is a single-chip 4Mb FIFO functionally composed of two OKI 2Mb FIFO
(First-In First-Out) memories which were designed for 256k 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 MS81V04160, functionally compatible with Oki's 2Mb FIFO memory
(MSM51V8222A), can be used as a x16 configuration FIFO.
The MS81V04160 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 MS81V04160 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 MS81V04160 provides high speed FIFO (First-in First-out) operation without external
refreshing: MS81V04160 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 MS81V04160’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 256 x 16-bit enable
high speed first-bit-access with no clock delay just after the write or read reset timings.
Additionally, the MS81V04160 has a write mask function or input enable function (IE), and
read- data skipping function or output enable function (OE). The differences between write
enable (WE) and input enable (IE), and between read enable (RE) and output enable (OE)
are that WE and RE can stop serial write/read address increments, but IE and OE cannot
stop the increment, when write/read clocking is continuously applied to MS81V04160. The
input enable (IE) function allows the user to write into selected locations of the memory
only, leaving the rest of the memory contents unchanged. This facilitates data processing to
display a “picture in picture” on a TV screen.
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