SN54ACT3641 Datasheet, PDF (17/26 Pages) Texas Instruments – 1024 × 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY

CLKB
ENB
ÎÎÎ ÏÏÏ ^tsu(EN1)
th(EN1)
RTM
ÎÎÎ ÏÏÏ ^tsu(RM)
th(RM)
RFM
SN54ACT3641
1024 × 36
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SGBS309A – AUGUST 1995 – REVISED APRIL 1998
ÏÏÏÏ
ÌÌÌÌÏÏÏÏ ^tsu(RM)
th(RM)
ÎÎÎ ÌÌ ^tsu(RM)
th(RM)
OR _High
ta
B0 – B35
W0
ta
W1
ta
W2
ta
W0
W1
Initiate Retransmit Mode
With W0 as First Word
Retransmit From
Selected Position
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
ÎÎÎÎÎÎÎÎÎÎ ^RFM
tsu(RM)
ÌÌÌÌ^thÌÌ^(RMÌÌ⁾ ÌÌ
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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