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LH540215 Datasheet(PDF) 30 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) 30 Page - Sharp Corporation

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540215-23
Q0 - Q17
REN
RCLK
PAE
OE
WEN
D0 - D17
WCLK
DATA READ
tDS
DATA IN OUTPUT REGISTER
tDS
DATA WRITE 1
DATA WRITE 2
tENS
tENH
tENH
tENS
tSKEW2(1)
tSKEW2(1)
tPAES
tPAES
tPAES
tA
LOW
NOTES:
1. tSKEW2 is the minimum time between a rising WCLK edge and a
rising RCLK edge for PAE to change predictably during the current
clock cycle. If the time between the rising edge of WCLK and the
rising edge of RCLK is less than tSKEW2, then it is not guaranteed
that PAE will change state until the next following RCLK edge.
2. PAE offset = q. Also, number of data words written into FIFO already = q.
3. The internal state of the FIFO:
At
, q+1 words.
At
, q words.
At
, q+1 words again.
Enhanced Operating Mode Timing Diagram
B
A
C
A
B
C
Figure 15. Programmable-Almost-Empty Flag Timing,
When Synchronous (Enhanced Operating Mode)
TIMING DIAGRAMS (cont’d)
LH540215/25
512 x 18/1024 x 18 Synchronous FIFO
30


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