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LH540215 Datasheet(PDF) 13 Page - Sharp Corporation

Part # LH540215
Description  512 x 18 / 1024 x 18 Synchronous FIFO
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH540215 Datasheet(HTML) 13 Page - Sharp Corporation

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Table 4. Status Flags
NUMBER OF UNREAD DATA WORDS PRESENT WITHIN FIFO
1, 2
FULL
FLAG
MIDDLE FLAGS
EMPTY
FLAG
512
× 18 FIFO
1024
× 18 FIFO
FF
PAF
HF
PAE
EF
0
0
HHH
L
L
1 to q
1 to q
H
H
H
L
H
(q + 1) to 256
(q + 1) to 512
HHHH
H
257 to (512 – (p + 1))
513 to (1024 – (p + 1))
H
H
L
H
H
(512 – p) to 511
(1024 – p) to 1023
H
L
L
H
H
512
1024
L
L
L
H
H
NOTES:
1.
q = Programmable-Almost-Empty Offset value. (Default values: 512
× 18, q = 63; 1024 × 18, q = 127.)
2.
p = Programmable-Almost-Full Offset value. (Default values: 512
× 18, p = 63; 1024 × 18, p = 127.)
3.
Only 9 (512
× 18) or 10 (1024 × 18) of the 12 offset-value-register bits should be programmed. The unneeded most-significant-end bits should
be LOW (zero).
4.
The flag output is delayed by one full clock cycle in Enhanced Operating Mode, when synchronous operation is specified for intermediate flags.
DESCRIPTION OF SIGNALS AND OPERATING SEQUENCES (cont’d)
BOLD ITALIC = Enhanced Operating Mode
512 x 18/1024 x 18 Synchronous FIFO
LH540215/25
13


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