Datasheet > MSM518222

MSM518222

更新时间： 2024-01-28 22:20:11

品牌	Logo	应用领域
冲电气 - OKI		存储
页数	文件大小	规格书
16页	182K
描述
262,214-Word x 8-Bit Field Memory

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数据手册

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MSM518222 数据手册

E2L0033-17-Y1

This version: Jan. 1998

Previous version: Dec. 1996

¡ Semiconductor

MSM518222

¡ Semiconductor

MSM518222

262,214-Word ¥ 8-Bit Field Memory

DESCRIPTION

The OKI MSM518222 is a high performance 2-Mbit, 256K ¥ 8-bit, Field Memory. It is designed for

high-speedserialaccessapplicationssuchasHDTVs,conventionalNTSCTVs,VTRs,digitalmovies

andMulti-mediasystems. The2-MbitcapacityfitsonefieldofaconventionalNTSCTVscreen. Two

cascadedMSM518222smakeoneframeofthescreen:twoormoreMSM518222scanbecascaded

directly without any delay devices between them. (Cascading provides larger storage depth or a

longer delay).

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.

TheMSM518222provideshighspeedFIFO,First-InFirst-Out,operationwithoutexternalrefreshing:

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

durationaslongasthepowerison. Internalconflictsofmemoryaccessandrefreshingoperations

are prevented by special arbitration logic.

The MSM518222'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.

TheMSM518222issimilarinoperationandfunctionalitytoOKI1-MbitFieldMemoryMSM514221B,

withtheadditionofcascadecapability. (AsforMSM514221Boperationcompatible2-MbitField

Memory, OKI has the MSM518221 which is a sister device of MSM518222).

Additionally,theMSM518222hasawritemaskfunctionorinputenablefunction(IE),andread-data

skippingfunctionoroutputenablefunction(OE). Thedifferencesbetweenwriteenable(WE)and

inputenable(IE),andbetweenreadenable(RE)andoutputenable(OE)arethatWEandREcanstop

serial write/read address increments, but IE and OE cannot stop the increment, when write/read

clocking is continuously applied to MSM518222. The input enable (IE) function allows the user to

writeintoselectedlocationsofthememoryonly,leavingtherestofthememorycontentsunchanged.

This facilitates data processing to display a "picture in picture" on a TV screen.

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与MSM518222相关器件

型号	品牌	获取价格	描述	数据表
MSM518222-25JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-25ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-30GS-K	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-30JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-30ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-40GS-K	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-40JS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222-40ZS	OKI	获取价格	262,214-Word x 8-Bit Field Memory
MSM518222A	OKI	获取价格	262,214-Word X 8-Bit Field Memory
MSM518222A-25JS	OKI	获取价格	262,214-Word X 8-Bit Field Memory

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