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7201

更新时间： 2023-12-20 18:44:28

品牌	Logo	应用领域
瑞萨 - RENESAS		先进先出芯片
页数	文件大小	规格书
15页	278K
描述
512 x 9 AsyncFIFO, 5.0V

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数据手册

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7201 数据手册

IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO

256 x 9, 512 x 9 and 1,024 x 9

COMMERCIAL,INDUSTRIALANDMILITARY

TEMPERATURERANGES

theFIFOpermitsareadingofasinglewordafterwritingonewordofdatainto

anemptyFIFO. Thedataisenabledonthebusin(tWEF +tA)nsaftertherising

edgeofW,calledthefirstwriteedge,anditremainsonthebusuntiltheRline

israisedfromLOW-to-HIGH, afterwhichthebuswouldgointoathree-state

mode after tRHZ ns. The EF line would have a pulse showing temporary

deassertionandthenwouldbeasserted.

In the write flow-through mode (Figure 18), the FIFO permits the writing

of a single word of data immediately after reading one word of data from a

fullFIFO. TheRlinecausestheFFtobedeassertedbuttheWlinebeingLOW

causesittobeassertedagaininanticipationofanewdataword. Ontherising

edge of W, the new word is loaded in the FIFO. The W line must be toggled

whenFFisnotassertedtowritenewdataintheFIFOandtoincrementthewrite

pointer.

USAGEMODES:

WIDTH EXPANSION

Word width may be increased simply by connecting the corresponding

inputcontrolsignalsofmultipledevices. Statusflags(EF,FFandHF)canbe

detectedfromanyonedevice. Figure13demonstratesan18-bitwordwidth

by using two IDT7200/7201A/7202As. Any word width can be attained by

adding additional IDT7200/7201A/7202As (Figure 13).

BIDIRECTIONAL OPERATION

Applications which require data buffering between two systems (each

system capable of Read and Write operations) can be achieved by pairing

IDT7200/7201A/7202AsasshowninFigure16.BothDepthExpansionand

Width Expansion may be used in this mode.

COMPOUND EXPANSION

Thetwoexpansiontechniquesdescribedabovecanbeappliedtogether

in a straightforward manner to achieve large FIFO arrays (see Figure 15).

DATA FLOW-THROUGH

Two types of flow-through modes are permitted, a read flow-through

and write flow-through mode. For the read flow-through mode (Figure 17),

(HALF-FULL FLAG)

WRITE (W)

(HF)

READ (R)

IDT

DATA OUT (Q)

DATA IN (D)

FULL FLAG (FF)

RESET (RS)

7200/

7201A/

7202A

EMPTY FLAG (EF)

RETRANSMIT (RT)

EXPANSION IN (XI)

2679 drw 14

Figure 12. Block Diagram of Single 256 x 9, 512 x 9, 1,024 x 9 FIFO

DATA (D)

IDT

WRITE (W)

FULL FLAG (FF)

RESET (RS)

READ (R)

7200/

7201A/

7202A

IDT

EMPTY FLAG (EF)

7200/

7201A/

7202A

RETRANSMIT (RT)

DATA OUT (Q)

2679 drw 15

Figure 13. Block Diagram of 256 x 18, 512 x 18, 1,024 x 18 FIFO Memory Used in Width Expansion Mode

1...7 8 91011 12 13...15

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