Datasheet > MSM518221A

MSM518221A

更新时间： 2024-01-19 22:39:40

品牌	Logo	应用领域
冲电气 - OKI		存储
页数	文件大小	规格书
17页	199K
描述
262,214-Word x 8-Bit Field Memory

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数据手册

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MSM518221A 数据手册

E2L0066-18-Z2

This version: Dec. 1998

MSM518221A

¡ Semiconductor

MSM518221A

262,214-Word ¥ 8-Bit Field Memory

DESCRIPTION

The OKI MSM518221A is a high performance 2-Mbit, 256K ¥ 8-bit, Field Memory. It is designed

forhigh-speedserialaccessapplicationssuchasHDTVs, conventionalNTSCTVs, VTRs, digital

movies and Multi-media systems. It is a FRAM for wide or low end use as general commodity

TVs and VTRs, exclusively. The MSM518221A is not designed for the other use or high end use

in medical systems, professional graphics systems which require long term picture, and data

storagesystemsandothers. The2-MbitcapacityfitsonefieldofaconventionalNTSCTVscreen.

Each of the 8-bit planes has separate serial write and read ports. These employ independent control

clockstosupportasynchronousreadandwriteoperations. Differentclockratesarealsosupported,

which allow alternate data rates between write and read data streams.

TheMSM518221AprovideshighspeedFIFO,First-InFirst-Out,operation without external refreshing:

it 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 MSM518221A'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.

AdditionalSRAMserialregisters, orlinebuffersfortheinitialaccessof256¥8-bitenablehighspeed

first-bit-access with no clock delay just after the write or read reset timings.

The MSM518221A is similar in operation and functionality to OKI 1-Mbit Field Memory

MSM514221B. Ithasawritemaskfunctionorinputenablefunction(IE), andread-dataskipping

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 MSM518221A. 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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与MSM518221A相关器件

型号	品牌	获取价格	描述	数据表
MSM518221A-25JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-25ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-30GS-K	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-30JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-30ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-40GS-K	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-40JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518221A-40ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-25JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory

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