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SN74ACT3651 데이터시트(PDF) 8 Page - Texas Instruments

부품명 SN74ACT3651
상세설명  2048 횞 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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SN74ACT3651
2048
× 36
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS439D – JUNE 1994 – REVISED FEBRUARY 1999
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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
L
L
X
X
In high-impedance state
None
L
L
H
L
In high-impedance state
None
L
L
H
H
In high-impedance state
Mail2 write
L
H
L
L
X
Active, FIFO output register
None
L
H
H
L
Active, FIFO output register
FIFO read
L
H
L
H
X
Active, mail1 register
None
L
H
H
H
Active, mail1 register
Mail1 read (set MBF1 high)
The setup- and hold-time constraints to the port clocks for the port-chip selects and write/read selects are only
for enabling write and read operations and are not related to high-impedance control of the data outputs. If a
port enable is low during a clock cycle, the port-chip select and write/read select can change states during the
setup- and hold-time window of the cycle.
When OR is low, the next data word is sent to the FIFO output register automatically by the CLKB low-to-high
transition that sets OR high. When OR is high, an available data word is clocked to the FIFO output register only
when a FIFO read is selected by CSB, W/RB, ENB, and MBB.
synchronized FIFO flags
Each FIFO flag is synchronized to its port clock through at least two flip-flop stages. This is done to improve the
flag’s reliability by reducing the probability of metastable events on their outputs when CLKA and CLKB operate
asynchronously with one another. OR and AE are synchronized to CLKB. IR and AF are synchronized to CLKA.
Table 4 shows the relationship of each flag to the number of words stored in memory.
Table 4. FIFO Flag Operation
NUMBER OF WORDS IN
FIFO†‡
SYNCHRONIZED
TO CLKB
SYNCHRONIZED
TO CLKA
FIFO†‡
OR
AE
AF
IR
0
L
L
H
H
1 to X
H
LH
H
(X + 1) to [2048 – (Y + 1)]
H
HH
H
(2048 – Y) to 2047
H
HL
H
2048
H
H
L
L
† X is the almost-empty offset for AE. Y is the almost-full offset for AF.
‡ When a word is present in the FIFO output register, its previous memory
location is free.


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