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SN74ABT3612 Datasheet(PDF) 8 Page - Texas Instruments

Part # SN74ABT3612
Description  CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN74ABT3612 Datasheet(HTML) 8 Page - Texas Instruments

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SN74ABT3612
64
× 36 × 2
CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCBS129G – JULY 1992 – REVISED APRIL 1998
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FIFO write/read operation (continued)
Table 3. Port-B Enable Function Table
CSB
W/RB
ENB
MBB
CLKB
B0 – B35 OUTPUTS
PORT FUNCTION
H
X
X
X
X
In high-impedance state
None
L
H
L
X
X
In high-impedance state
None
L
H
H
L
In high-impedance state
FIFO2 write
L
H
H
H
In high-impedance state
Mail2 write
L
L
L
L
X
Active, FIFO1 output register
None
L
L
H
L
Active, FIFO1 output register
FIFO1 read
L
L
L
H
X
Active, mail1 register
None
L
L
H
H
Active, mail1 register
Mail1 read (set MBF1 high)
synchronized FIFO flags
Each FIFO flag is synchronized to its port clock through two flip-flop stages. This is done to improve flag reliability
by reducing the probability of metastable events on the output when CLKA and CLKB operate asynchronously
to one another. EFA, AEA, FFA, and AFA are synchronized to CLKA. EFB, AEB, FFB, and AFB are synchronized
to CLKB. Tables 4 and 5 show the relationship of each port flag to FIFO1 and FIFO2.
Table 4. FIFO1 Flag Operation
NUMBER OF WORDS
IN FIFO1†
SYNCHRONIZED
TO CLKB
SYNCHRONIZED
TO CLKA
IN FIFO1†
EFB
AEB
AFA
FFA
0
L
L
H
H
1 to X
H
LH
H
(X +1) to [64 – (X +1)]
H
HH
H
(64 – X) to 63
H
HL
H
64
H
H
L
L
† X is the value in the almost-empty flag and almost-full flag offset register.
Table 5. FIFO2 Flag Operation
NUMBER OF WORDS
IN FIFO2†
SYNCHRONIZED
TO CLKA
SYNCHRONIZED
TO CLKB
IN FIFO2†
EFA
AEA
AFB
FFB
0
L
L
H
H
1 to X
H
LH
H
(X +1) to [64 – (X +1)]
H
HH
H
(64 – X) to 63
H
HL
H
64
H
H
L
L
† X is the value in the almost-empty flag and almost-full flag offset register.


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