8

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

Figure 5. Empty Flag Timing From Last Read to First Write

NOTE:

1. EF, FF and HF may change status during Retransmit, but flags will be valid at tRTC.

Figure 7. Minimum Timing for an Empty Flag Coincident Read Pulse.

Figure 8. Minimum Timing for a Full Flag Coincident Write Pulse.

W

R

EF

tWEF

tREF

FIRST WRITE

IGNORED

READ

LAST READ

DATA OUT

VALID

tA

2661 drw07

tRTC

tRT

tRTS

RT

W,R

HF, EF, FF

tRTR

FLAG VALID

2661 drw08

tRTF

EF

W

R

tRPE

2661 drw09

tWEF

FF

R

W

tWPF

2661 drw10

tRFF

Figure 6. Retransmit