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SN74ABT3612 Datasheet(PDF) 5 Page - Texas Instruments

Part No. SN74ABT3612
Description  64 × 36 × 2 CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN74ABT3612 Datasheet(HTML) 5 Page - Texas Instruments

 
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SN74ABT3612
64
× 36 × 2
CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCBS129G – JULY 1992 – REVISED APRIL 1998
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
PIN NAME
I/O
DESCRIPTION
A0 – A35
I/O
Port-A data. The 36-bit bidirectional data port for side A.
AEA
O
(port A)
Port-A almost-empty flag. Programmable flag synchronized to CLKA. AEA is low when the number of words in FIFO2
is less than or equal to the value in offset register X.
AEB
O
(port B)
Port-B almost-empty flag. Programmable flag synchronized to CLKB. AEB is low when the number of words in FIFO1
is less than or equal to the value in offset register X.
AFA
O
(port A)
Port-A almost-full flag. Programmable flag synchronized to CLKA. AFA is low when the number of empty locations in
FIFO1 is less than or equal to the value in offset register X.
AFB
O
(port B)
Port-B almost-full flag. Programmable flag synchronized to CLKB. AFB is low when the number of empty locations in
FIFO2 is less than or equal to the value in offset register X.
B0 – B35
I/O
Port-B data. The 36-bit bidirectional data port for side B.
CLKA
I
Port-A clock. CLKA is a continuous clock that synchronizes all data transfers through port A and can be asynchronous
or coincident to CLKB. EFA, FFA, AFA, and AEA are synchronized to the low-to-high transition of CLKA.
CLKB
I
Port-B clock. CLKB is a continuous clock that synchronizes all data transfers through port B and can be asynchronous
or coincident to CLKA. EFB, FFB, AFB, and AEB are synchronized to the low-to-high transition of CLKB.
CSA
I
Port-A chip select. CSA must be low to enable a low-to-high transition of CLKA to read or write data on port A. The
A0 – A35 outputs are in the high-impedance state when CSA is high.
CSB
I
Port-B chip select. CSB must be low to enable a low-to-high transition of CLKB to read or write data on port B. The
B0 – B35 outputs are in the high-impedance state when CSB is high.
EFA
O
(port A)
Port-A empty flag. EFA is synchronized to the low-to-high transition of CLKA. When EFA is low, FIFO2 is empty and
reads from its memory are disabled. Data can be read from FIFO2 to the output register when EFA is high. EFA is forced
low when the device is reset and is set high by the second low-to-high transition of CLKA after data is loaded into empty
FIFO2 memory.
EFB
O
(port B)
Port-B empty flag. EFB is synchronized to the low-to-high transition of CLKB. When EFB is low, FIFO1 is empty and
reads from its memory are disabled. Data can be read from FIFO1 to the output register when EFB is high. EFB is forced
low when the device is reset and is set high by the second low-to-high transition of CLKB after data is loaded into empty
FIFO1 memory.
ENA
I
Port-A enable. ENA must be high to enable a low-to-high transition of CLKA to read or write data on port A.
ENB
I
Port-B enable. ENB must be high to enable a low-to-high transition of CLKB to read or write data on port B.
FFA
O
(port A)
Port-A full flag. FFA is synchronized to the low-to-high transition of CLKA. When FFA is low, FIFO1 is full and writes
to its memory are disabled. FFA is forced low when the device is reset and is set high by the second low-to-high
transition of CLKA after reset.
FFB
O
(port B)
Port-B full flag. FFB is synchronized to the low-to-high transition of CLKB. When FFB is low, FIFO2 is full and writes
to its memory are disabled. FFB is forced low when the device is reset and is set high by the second low-to-high
transition of CLKB after reset.
FS1, FS0
I
Flag-offset selects. The low-to-high transition of RST latches the values of FS0 and FS1, which selects one of four
preset values for the almost-empty flag and almost-full flag offset.
MBA
I
Port-A mailbox select. A high level on MBA chooses a mailbox register for a port-A read or write operation. When the
A0 – A35 outputs are active, a high level on MBA selects data from the mail2 register for output and a low level selects
FIFO2 output register data for output.
MBB
I
Port-B mailbox select. A high level on MBB chooses a mailbox register for a port-B read or write operation. When the
B0 – B35 outputs are active, a high level on MBB selects data from the mail1 register for output and a low level selects
FIFO1 output register data for output.
MBF1
O
Mail1 register flag. MBF1 is set low by the low-to-high transition of CLKA that writes data to the mail1 register. Writes
to the mail1 register are inhibited while MBF1 is low. MBF1 is set high by a low-to-high transition of CLKB when a port-B
read is selected and MBB is high. MBF1 is set high when the device is reset.


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