5.05

10

IDT7207 CMOS ASYNCHRONOUS FIFO

32,768 x 9

MILITARY AND COMMERCIAL TEMPERATURE RANGES

TRUTH TABLES

TABLE I – RESET AND RETRANSMIT

SINGLE DEVICE CONFIGURATION/WIDTH EXPANSION MODE

Inputs

Internal Status

Outputs

Mode

RS

RS

RT

RT

XI

XI

Read Pointer

Write Pointer

EF

EF

FF

FF

HF

HF

Reset

0

X

0

Location Zero

Location Zero

0

1

1

Retransmit

1

0

0

Location Zero

Unchanged

X

X

X

Read/Write

1

1

0

XX

X

TABLE II – RESET AND FIRST LOAD

DEPTH EXPANSION/COMPOUND EXPANSION MODE

Inputs

Internal Status

Outputs

Mode

RS

RS

FL

FL

XI

XI

Read Pointer

Write Pointer

EF

EF

FF

FF

Reset First Device

0

0

(1)

Location Zero

Location Zero

0

1

Reset all Other Devices

0

1

(1)

Location Zero

Location Zero

0

1

Read/Write

1

X

(1)

X

X

X

X

Figure 14. Block Diagram of 98,304 x 9 FIFO Memory (Depth Expansion)

NOTES:

3140 tbl 10

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

NOTE:

3140 tbl 09

1. Pointer will Increment if flag is HIGH.

D

W

IDT

7207

FF

EF

FL

XO

RS

FULL

EMPTY

R

9

9

99

XI

9

Q

FF

EF

FL

XO

XI

FF

EF

FL

XO

XI

IDT

7207

IDT

7207

3140 drw 17