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SN74ACT7804 Datenblatt(PDF) 4 Page - Texas Instruments

Teilenummer SN74ACT7804
Bauteilbeschribung  512 횞 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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SN74ACT7804
512
× 18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS204C – APRIL 1992 – REVISED APRIL 1998
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
offset values for AF/AE
The AF/AE flag has two programmable limits: the almost-empty offset value (X) and the almost-full offset value
(Y). They can be programmed after the FIFO is reset and before the first word is written to memory. The AF/AE
flag is high when the FIFO contains X or fewer words or (512 – Y) or more words.
To program the offset values, PEN can be brought low after reset only when LDCK is low. On the following
low-to-high transition of LDCK, the binary value on D0–D7 is stored as the almost-empty offset value (X) and
the almost-full offset value (Y). Holding PEN low for another low-to-high transition of LDCK reprograms Y to the
binary value on D0–D7 at the time of the second LDCK low-to-high transition. Writes to the FIFO memory are
disabled while the offsets are programmed. A maximum value of 255 can be programmed for either X or Y (see
Figure 1). To use the default values of X = Y = 64, PEN must be held high.
RESET
X and Y
Y
PEN
D0–D7
EMPTY
Don’t Care
LDCK
Don’t Care
Figure 1. Programming X and Y Separately


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