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SN74ACT7808-30PAG Arkusz danych(PDF) 6 Page - Texas Instruments

Numer części SN74ACT7808-30PAG
Szczegółowy opis  2048 횞 9 STROBED FIRST-IN, FIRST-OUT MEMORY
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SN74ACT7808
2048
× 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS205E – FEBRUARY 1991 – REVISED NOVEMBER 2001
6
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. If the
offsets are not programmed, the default values of X = Y = 256 are used. The AF/AE flag is high when the FIFO
contains X or fewer words or (2048 – Y) or more words.
To program the offset values, program enable (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–D8 and DP9 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–D8 and DP9 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 1023 can be
programmed for either X or Y (see Figure 1). To use the default values of X = Y = 256, PEN must be held high.
RESET
X and Y
Y
PEN
D0–D8
LDCK
Don’t Care
EMPTY
X and Y MSB
Y MSB
Don’t Care
DP9
Don’t Care
Figure 1. Programming X and Y Separately


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