SN74ALVC3631_07 Datasheet, PDF (17/29 Pages) Texas Instruments – SYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES

SN74ALVC3631, SN74ALVC3641, SN74ALVC3651
512 × 36, 1024 × 36, 2048 × 36
SYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES
SDMS025B – OCTOBER 1999 – REVISED JUNE 2000
CLKB
ENB
ÎÎÎÏÏÏ ^tsu(EN)
th(EN)
RTM
ÎÎÎ ^tsu(EN)
RFM
ÏÏÏ ^tsu(EN)
th(EN)
ÎÎÎ ÌÌÌ ^tsu(EN)
th(EN)
OR
B0–B35
High
ta
W0
Initiate Retransmit Mode
With W0 as First Word
ta
W1
ta
W2
Retransmit From
Selected Position
ta
W0
W1
End Retransmit
Mode
NOTE A: CSB = L, W/RB = H, MBB = L. No input enables other than RTM and RFM are needed to control retransmit mode or begin a retransmit.
Other enables are shown only to relate retransmit operations to the FIFO output register.
Figure 10. Retransmit Timing Showing Minimum Retransmit Length
CLKB
1
2
RTM _High
ÎÎÎÎÎ ÌÌÌÌÌ ^RFM
tsu(RM)
th(RM)
AE
X or Fewer Words From Empty
tpd(C-AE)
(X + 1) or More Words From Empty
NOTE A: X is the value loaded in the AE-flag offset register.
Figure 11. AE Maximum Latency When Retransmit Increases the Number of Stored Words Above X
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