Datasheet > MSM518222A

MSM518222A

更新时间： 2024-09-26 10:45:23

品牌	Logo	应用领域
冲电气 - OKI		存储
页数	文件大小	规格书
17页	190K
描述
262,214-Word X 8-Bit Field Memory

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中文翻译

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数据手册

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MSM518222A 数据手册

E2L0067-18-Z2

This version: Dec. 1998

MSM518222A

¡ Semiconductor

MSM518222A

262,214-Word ¥ 8-Bit Field Memory

DESCRIPTION

The OKI MSM518222A 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 MSM518222A 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.

Two cascaded MSM518222As make one frame of the screen: two or more MSM518222As can be

cascaded 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.

TheMSM518222AprovideshighspeedFIFO,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

duration as long as the power is on. Internal conflicts of memory access and refreshing operations

are prevented by special arbitration logic.

The MSM518222A'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 MSM518222A is similar in operation and functionality to OKI 1-Mbit Field Memory

MSM514221B,withtheadditionofcascadecapability. (AsforMSM514221Boperationcompatible

2-Mbit Field Memory, OKI has the MSM518221A which is a sister device of MSM518222A).

Additionally, the MSM518222A 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)

andinputenable(IE), andbetweenreadenable(RE)andoutputenable(OE)arethatWEandREcan

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

read clocking is continuously applied to MSM518222A. 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MSM518222A相关器件

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

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