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SN74ACT72231L35RJ Folha de dados(PDF) 6 Page - Texas Instruments

Nome de Peças SN74ACT72231L35RJ
Descrição Electrónicos  SYNCHRONOUS FIRST-IN FIRST-OUT MEMORIES
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SN74ACT72211L, SN74ACT72221L, SN74ACT72231L, SN74ACT72241L
512 × 9, 1024 × 9, 2048 × 9, AND 4096 × 9
SYNCHRONOUS FIRST IN, FIRST OUT MEMORIES
SCAS222 − FEBRUARY 1993 − REVISED JUNE 1993
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
flag programming (continued)
Table 1. Writing the Offset Registers
LD
WEN1
WCLK†
SELECTION
0
0
Empty offset (LSB)
Empty offset (MSB)
Full offset (LSB)
Full offset (MSB)
0
1
No operation
1
0
Write into FIFO
1
1
No operation
† The same selection sequence applies to reading from
the registers. REN1 and REN2 are enabled and a read
is performed on the low-to-high transition of RCLK.
programmable flag (PAE, PAF) operation
Whether the flag offset registers are programmed as described in Table 1 or the default values are used, the
programmable almost-empty flag (PAE) and programmable almost-full flag (PAF) states are determined by their
corresponding offset registers and the difference between the read and write pointers.
The number formed by the empty offset least significant bit register and empty offset most significant bit register
is referred to as n and determines the operation of PAE. PAE is synchronized to the low-to-high transition of
RCLK by one flip-flop and is low when the FIFO contains n or fewer unread words. PAE is set high by the
low-to-high transition of RCLK when the FIFO contains (n + 1) or greater unread words.
The number formed by the full offset least significant bit register and full offset most significant bit register is
referred to as m and determines the operation of PAF. PAF is synchronized to the low-to-high transition of WCLK
by one flip-flop and is set low when the number of unread words in the FIFO is greater then or equal to (512 − m)
for the SN74ACT72211L, (1024 − m) for the SN74ACT72221L, (2048 − m) for the SN74ACT72231L, and
(4096 − m) for the SN74ACT72241L. PAF is set high by the low-to-high transition of WCLK when the number
of available memory locations is greater than m (see Table 2).
Table 2. Status Flags
NUMBER OF WORDS IN FIFO
OUTPUTS
SN74ACT72211L
SN74ACT72221L
SN74ACT72231L
SN74ACT72241L
FF
PAF
PAE
EF
0
0
0
0
H
H
L
L
1 to n†
1 to n†
1 to n†
1 to n†
H
HL
H
(n + 1) to
[512 − (m + 1)]
(n + 1) to
[1024 − (m + 1)]
(n + 1) to
[2048 − (m + 1)]
(n + 1) to
[4096 − (m + 1)]
H
HH
H
(512 − m)‡ to 511
(1024 − m)‡ to 1023
(2048 − m)‡ to 2047
(4096 − m)‡ to 4095
H
LH
H
512
1024
2048
4096
L
L
H
H
† n = empty offset (default value = 7)
‡ m = full offset (default value = 7)


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