SN74ACT7203L, SN74ACT7204L, SN74ACT7205L, SN74ACT7206L

2048 × 9, 4096 × 9, 8192 × 9, 16384 × 9

ASYNCHRONOUS FIRST IN, FIRST OUT MEMORIES

SCAS226A − FEBRUARY 1993 − REVISED SEPTEMBER 1995

12

POST OFFICE BOX 655303

POST OFFICE BOX 1443

PARAMETER MEASUREMENT INFORMATION

R

EF

W

tpd(R-E)

tpd(W-E)

Last Read

Ignored

Read

First Write

Additional Writes

Valid

D0 − D8

ta

Figure 3. Empty-Flag Waveforms

FL /RT

tc(RT)

tw(RT)

tsu(RT)

th(RT)

W, R

tpd(RT-FL)

XO /HF, EF, FF

Valid Flag

NOTE A: The EF, FF, and XO/HF status flags are valid after completion of the retransmit cycle.

Figure 4. Retransmit Waveforms