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SN74ABT7820 Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte SN74ABT7820
Spiegazioni elettronici  512 횞 18 횞 2 STROBED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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SN74ABT7820 Scheda tecnica(HTML) 7 Page - Texas Instruments

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SN74ABT7820
512
× 18 × 2
STROBED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCAS206D – AUGUST 1991 – REVISED APRIL 1998
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
A0 – A17
I/O
Port-A data. The 18-bit bidirectional data port for side A.
AF/AEA
O
FIFO A almost-full/almost-empty flag. Depth-offset values can be programmed for AF/AEA or the default value of 128 can
be used for both the almost-empty offset (X) and the almost-full offset (Y). AF/AEA is high when FIFO A contains X or
fewer words or (512 – Y) or more words. AF/AEA is set high after FIFO A is reset.
AF/AEB
O
FIFO B almost-full/almost-empty flag. Depth-offset values can be programmed for AF/AEB or the default value of 128 can
be used for both the almost-empty offset (X) and the almost-full offset (Y). AF/AEB is high when FIFO B contains
X or fewer words or (512 – Y) or more words. AF/AEB is set high after FIFO B is reset.
B0 – B17
I/O
Port-B data. The 18-bit bidirectional data port for side B.
EMPTYA
O
FIFO A empty flag. EMPTYA is low when FIFO A is empty and high when FIFO A is not empty. EMPTYA is set low after
FIFO A is reset.
EMPTYB
O
FIFO B empty flag. EMPTYB is low when FIFO B is empty and high when FIFO B is not empty. EMPTYB is set low after
FIFO B is reset.
FULLA
O
FIFO A full flag. FULLA is low when FIFO A is full and high when FIFO A is not full. FULLA is set high after FIFO A is reset.
FULLB
O
FIFO B full flag. FULLB is low when FIFO B is full and high when FIFO B is not full. FULLB is set high after FIFO B is reset.
GAB
I
Port-B output enable. B0 – B17 outputs are active when GAB is high and in the high-impedance state when GAB is low.
GBA
I
Port-A output enable. A0 – A17 outputs are active when GBA is high and in the high-impedance state when GBA is low.
HFA
O
FIFO A half-full flag. HFA is high when FIFO A contains 256 or more words and is low when FIFO A contains 255 or fewer
words. HFA is set low after FIFO A is reset.
HFB
O
FIFO B half-full flag. HFB is high when FIFO B contains 256 or more words and is low when FIFO B contains 255 or fewer
words. HFB is set low after FIFO B is reset.
LDCKA
I
FIFO A load clock. Data is written into FIFO A on a low-to-high transition of LDCKA when FULLA is high. The first word
written into an empty FIFO A is sent directly to the FIFO A data outputs.
LDCKB
I
FIFO B load clock. Data is written into FIFO B on a low-to-high transition of LDCKB when FULLB is high. The first word
written into an empty FIFO B is sent directly to the FIFO B data outputs.
PENA
I
FIFO A program enable. After reset and before a word is written into FIFO A, the binary value on A0 – A7 is latched as
an AF/AEA offset value when PENA is low and LDCKA is high.
PENB
I
FIFO B program enable. After reset and before a word is written into FIFO B, the binary value on B0 – B7 is latched as
an AF/AEB offset value when PENB is low and LDCKB is high.
RSTA
I
FIFO A reset. A low level on RSTA resets FIFO A forcing EMPTYA low, HFA low, FULLA high, and AF/AEA high.
RSTB
I
FIFO B reset. A low level on RSTB resets FIFO B forcing EMPTYB low, HFB low, FULLB high, and AF/AEB high.
SAB
I
Port-B read select. SAB selects the source of B0 – B17 read data. A low level selects real-time data from A0 – A17. A high
level selects the FIFO A output.
SBA
I
Port-A read select. SBA selects the source of A0 – A17 read data. A low level selects real-time data from B0 – B17. A high
level selects the FIFO B output.
UNCKA
I
FIFO A unload clock. Data is read from FIFO A on a low-to-high transition of UNCKA when EMPTYA is high.
UNCKB
I
FIFO B unload clock. Data is read from FIFO B on a low-to-high transition of UNCKB when EMPTYB is high.


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