27

COMMERCIALTEMPERATURERANGE

IDT723663/723673 CMOS SyncFIFOTM WITH BUS-MATCHING

4,096 x 36 x 2 and 8,192 x 36 x 2

CLKA

ENB

CLKB

RT

5610 drw21

tRSTS

tRSTH

tREF

(2)

B0-Bn

RTM

EF

tREF

(2)

W1

Wx

tA

tENS2

tENH

13

4

2

1

34

2

tRTMS

tRTMH

CLKA

ENB

CLKB

RT

5610 drw22

tRSTS

tRSTH

tREF

(2)

B0-Bn

RTM

OR

tREF

(2)

W1

Wx

tA

13

4

2

1

34

2

tRTMS

tRTMH

LOW

NOTES:

1. CSB = LOW; W/RB is HIGH

2. Retransmit setup is complete after EF returns HIGH, only then can a read operation begin.

3. W1 = first word written to the FIFO after Master Reset.

4. No more than D-2 may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, FF will be LOW throughout the Retransmit setup procedure.

D = 4,096 and 8,192 for the IDT723663 and IDT723673 respectively.

Figure 19. Retransmit Timing (IDT Standard Mode)

NOTES:

1. CSB = LOW; W/RB is HIGH

2. Retransmit setup is complete after OR returns HIGH, only then can a read operation begin.

3. W1 = first word written to the FIFO after Master Reset.

4. No more than D-2 may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, IR will be LOW throughout the Retransmit setup procedure.

D = 4,096 and 8,192 for the IDT723663 and IDT723673 respectively.

Figure 20. Retransmit Timing (FWFT Mode)