IDT72271L10GB 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72271L10GB

CMOS SUPERSYNC FIFO™ 16,384 x 9, 32,768 x 9

Integrated Device Technology 

IDT72261/72271 SyncFIFO™

16,384 x 9, 32,768 x 9

MILITARY AND COMMERCIAL TEMPERATURE RANGES

OPERATING CONFIGURATIONS

SINGLE DEVICE CONFIGURATION

A single IDT72261/722171 may be used when the applica-

tion requirements are for 16,384/32,768 words or less. The

IDT72261/72271 can always be used in Single Device Con-

figuration, whether IDT Standard Mode or FWFT Mode has

been selected. No special set up procedure is necessary.

PARTIAL RESET (PRS) MASTER RESET (MRS)

WRITE CLOCK (WCLK)

WRITE ENABLE (WEN)

LOAD (LD)

DATA IN (D0 - D8)

SERIAL ENABLE(SEN)

FIRST WORD FALL THROUGH/SERIAL INPUT

(FWFT/SI)

FULL FLAG/INPUT READY (FF/IR)

PROGRAMMABLE ALMOST FULL (PAF)

IDT

72261/

72271

READ CLOCK (RCLK)

READ ENABLE (REN)

OUTPUT ENABLE (OE)

DATA OUT (Q0 - Q8)

RETRANSMIT (RT)

EMPTY FLAG/OUTPUT READY (EF/OR)

PROGRAMMABLE ALMOST EMPTY (PAE)

HALF FULL FLAG (HF)

FREQUENCY SELECT (FS)

Figure 21. Block Diagram of Single 16,384x9/32,768x9 Synchronous FIFO

3036 drw 24

WIDTH EXPANSION CONFIGURATION

Word width may be increased simply by connecting to-

gether the control signals of multiple devices. Status flags can

be detected from any one device. The exceptions are the EF

and FF functions in IDT Standard mode and the IR and OR

functions in FWFT mode. Because of variations in skew

between RCLK and WCLK, it is possible for EF/FF deassertion

and IR/OR assertion to vary by one cycle between FIFOs. In

IDT Standard mode, such problems can be avoided by creat-

ing composite flags, that is, ANDing EF of every FIFO, and

separately ANDing FF of every FIFO. In FWFT mode, com-

posite flags can be created by ORing OR of every FIFO, and

separately ORing IR of every FIFO. Figure 22 demonstrates

an 18-word width by using two IDT72261/72271s. Any word

width can be attained by adding additional IDT7226172271s.

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