IDT7280L12PAGI8 Просмотр технического описания (PDF) - Integrated Device Technology

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IDT7280L12PAGI8

CMOS DUAL ASYNCHRONOUS FIFO DUAL 256 x 9, DUAL 512 x 9, DUAL 1,024 x 9, DUAL 2,048 x 9, DUAL 4,096 x 9, DUAL 8,192 x 9

Integrated Device Technology 

IDT7280/7281/7282/7283/7284/7285 5V ASYNCHRONOUS FIFO

DUAL 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9

COMMERCIAL TEMPERATURE RANGE

TABLE 1 — RESET AND RETRANSMIT

Single Device Configuration/Width Expansion Mode

Inputs

Internal Status

Mode

RS

RT

XI

Read Pointer

Write Pointer

Reset

Retransmit

Read/Write

0

X

0

Location Zero

Location Zero

1

0

0

Location Zero

Unchanged

1

1

0

Increment(1)

Increment(1)

NOTE:

1. Pointer will increment if flag is High.

Outputs

EF

FF

HF

0

1

1

X

X

X

X

X

X

TABLE 2 — RESET AND FIRST LOAD TRUTH TABLE

Depth Expansion/Compound Expansion Mode

Mode

Inputs

Internal Status

RS

FL

XI

Read Pointer

Write Pointer

Outputs

EF

FF

Reset First Device

0

0

(1)

Location Zero

Location Zero

0

Reset All Other Devices

0

1

(1)

Location Zero

Location Zero

0

Read/Write

1

X

(1)

X

X

X

NOTE:

1. XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output,

XI = Expansion Input, HF = Half-Full Flag Output

1

1

X

10

XOA

W

D

9

FFA

EFA

FIFO A

FLA

XIA

7280/7281/

7282/7283/

7284/7285

XOB

FFB

EFB

FIFO B

9

9

FLB

XIB

XOA

R

Q

V CC

FULL

FFA

EFA

9

FIFO A

FLA

XIA

7280/7281/

7282/7283/

7284/7285 XOB

FFB

9

EFB

FIFO B

EMPTY

RSA

FLB

XIB

3208 drw 16

Figure 14. Block Diagram of 1,024 x 9, 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9 FIFO Memory (Depth Expansion)

9

JUNE 29, 2012

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