11

COMMERCIAL,INDUSTRIALANDMILITARY

TEMPERATURERANGES

IDT7203/7204/7205/7206/7207/7208 CMOS ASYNCHRONOUS FIFO

2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9 and 65,536 x 9

TRUTH TABLES

TABLE 1 – RESET AND RETRANSMIT

SINGLE DEVICE CONFIGURATION/WIDTH EXPANSION MODE

NOTE:

1. Pointer will Increment if flag is HIGH.

TABLE 2 – RESET AND FIRST LOAD

DEPTHEXPANSION/COMPOUNDEXPANSIONMODE

NOTES:

1. XI is connected to XO of previous device. See Figure 14.

2. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output, XI = Expansion Input, HF = Half-Full Flag Output

Figure 14. Block Diagram of 6,144 x 9, 12,288 x 9, 24,576 x 9, 49,152 x 9, 98,304 x 9, 196,608 x 9 FIFO Memory (Depth Expansion)

D

W

IDT

7203

7204

7205

7206

7207

7208

FF

EF

FL

XO

RS

FULL

EMPTY

VCC

R

9

9

99

XI

9

Q

FF

EF

FL

XO

XI

FF

EF

FL

XO

XI

IDT

7203

7204

7205

7206

7207

7208

IDT

7203

7204

7205

7206

7207

7208

2661 drw16

Inputs

Internal Status

Outputs

Mode

RS

FL/RT

XI

Read Pointer

Write Pointer

EF

FF

HF

Reset

0

X

0

LocationZero

LocationZero

0

1

1

Retransmit

1

0

0

LocationZero

Unchanged

X

X

X

Read/Write

1

1

0

Increment(1)

Increment(1)

XXX

Inputs

Internal Status

Outputs

Mode

RS

FL/RT

XI

Read Pointer

Write Pointer

EF

FF

Reset First Device

0

0

(1)

LocationZero

LocationZero

0

1

Reset All Other Devices

0

1

(1)

LocationZero

LocationZero

0

1

Read/Write

1

X

(1)

X

X

X

X