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SN74ALVC7804 데이터시트(PDF) 5 Page - Texas Instruments

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부품명 SN74ALVC7804
상세설명  512 횞 18 FIRST-IN, FIRST-OUT MEMORY
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SN74ALVC7804
512
× 18
FIRST-IN, FIRST-OUT MEMORY
SCAS432 – JANUARY 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DATA WORD NUMBERS FOR FLAG TRANSITIONS
DEVICE
TRANSITION WORD
DEVICE
A
B
C
D
E
F
G
H
I
SN74ALVC7804
W256
W(512 – Y)
W512
W257
W258
W(512 – X)
W(513 – X)
W511
W512
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 less words or (512 minus Y) or more words.
To program the offset values, PEN can be brought low after reset. 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 2). To use the
default values of X = Y = 64, PEN must be held high.Figure 1
LDCK
RESET
X and Y
Y
PEN
D0 – D17
EMPTY
Don’t Care
Don’t Care
Figure 2. Programming X and Y Separately


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