10

COMMERCIALTEMPERATURERANGE

IDT72420/72200/72210/72220/72230/72240 CMOS SYNCFIFO™

64 x 8, 256 x 8, 512 x 8, 1,024 x 8, 2,048 x 8, 4,096 x 8

FEBRUARY 10, 2006

Figure 10. Block Diagram of Single 64 x 8, 256 x 8, 512 x 8, 1,024 x 8, 2,048 x 8, 4,096 x 8 Synchronous FIFO

WIDTH EXPANSION CONFIGURATION - Word width may be increased

simply by connecting the corresponding input control signals of multiple

devices. A composite flag should be created for each of the endpoint status

flags (

EF and FF) The partial status flags (AE and AF) can be detected from

any one device. Figure 11 demonstrates a 16-bit word width by using two

IDT72420/72200/72210/72220/72230/72240s. Any word width can be

attained by adding additional IDT72420/72200/72210/72220/72230/72240s.

Figure 11. Block Diagram of 64 x 16, 256 x 16, 512 x 16, 1,024 x 16, 2,048 x 16, 4,096 x 16

Synchronous FIFO Used in a Width Expansion Configuration

WRITE CLOCK (WCLK)

READ CLOCK (RCLK)

READ ENABLE (REN)

OUTPUT ENABLE (OE)

FULL FLAG (FF)

ALMOST-FULL (AF)

EMPTY FLAG (EF)

ALMOST-EMPTY(AE)

IDT

72420

72200

72210

72220

72230

72240

RESET (RS)

WRITE ENABLE (WEN)

2680 drw 12

WRITE CLOCK (WCLK)

DATA IN (D)

IDT

72420

72200

72210

72220

72230

72240

16

8

8

8

RESET (RS)

RESET (RS)

WRITE ENABLE (WEN)

FULL FLAG (FF) #1

ALMOST-FULL (AF)

FULL FLAG (FF) #2

IDT

72420

72200

72210

72220

72230

72240

8

16

READ CLOCK (RCLK)

READ ENABLE (REN)

OUTPUT ENABLE (OE)

ALMOST-EMPTY (AE)

EMPTY FLAG (EF) #1

EMPTY FLAG (EF) #2

DATA OUT(Q)

2680 drw 13

OPERATING CONFIGURATIONS

SINGLE DEVICE CONFIGURATION - A single IDT72420/72200/72210/

72220/72230/72240 may be used when the application requirements are

for 64/256/512/1,024/2,048/4,096 words or less. See Figure 10.