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SN74ABT7820-20PN Datasheet(PDF) 9 Page - Texas Instruments

Part # SN74ABT7820-20PN
Description  STROBED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN74ABT7820-20PN Datasheet(HTML) 9 Page - Texas Instruments

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SN74ABT7820
512
× 18 × 2
STROBED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCAS206D – AUGUST 1991 – REVISED APRIL 1998
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
offset values for AF/AEFigure 2
The AF/AE flag of each FIFO has two programmable limits: the almost-empty offset value (X) and the almost-full
offset value (Y). The offsets of a flag can be programmed from the input of its FIFO after it is reset and before
any data is written to its memory. An AF/AE flag is high when its FIFO contains X or fewer words or (512 – Y)
or more words.
To program the offset values for AF/AEA, program enable (PENA) can be brought low after FIFO A is reset and
only when LDCKA is low. On the following low-to-high transition of LDCKA, the binary value on A0 – A7 is stored
as the almost-empty offset value (X) and the almost-full offset value (Y). Holding PENA low for another
low-to-high transition of LDCKA reprograms Y to the binary value on A0 – A7 at the time of the second LDCKA
low-to-high transition.
PENA can be brought back high only when LDCKA is low during the first two LDCKA cycles. PENA can be
brought high at any time after the second LDCKA pulse returns low. A maximum value of 255 can be
programmed for either X or Y (see Figure 3). To use the default values of X = Y = 128 for AF/AEA, PENA must
be tied high. No data is stored in the FIFO when its AF/AE offsets are programmed. The AF/AEB flag is
programmed in the same manner. PENB enables LDCKB to program the AF/AEB offset values taken from
B0 – B7.
RSTA
X and Y
Y
PENA
A0 – A17
EMPTYA
1
2
LDCKA
Word 1
Figure 3. Programming X and Y Separately for AF/AEA


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