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LH540215 Datasheet(PDF) 25 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) 25 Page - Sharp Corporation

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tDS
tENS
Q0 - Q17
REN
RCLK
EF
OE
WEN
540215-8
D0 (FIRST
VALID WRTE)
D1
D2
D3
D4
D0
D1
tFRL (2)
tSKEW2 (1)
tREF
tA (3)
tA
tOLZ
tOE
D0 - D17
WCLK
NOTES:
1. tSKEW2 is the minimum time between a rising RCLK edge and a rising
WCLK edge for FF to change predictably during the current clock cycle.
If the time between the rising edge of RCLK and the rising edge of
WCLK is less than tSKEW2, then it is not guaranteed that FF will change
state until the next following WCLK edge.
2. tFRL (First-Read Latency) is the minimum time between a rising WCLK
edge and a rising RCLK edge to assure a correct readout of the first data
word D0 in response to the next RCLK edge. Thus, tFRL = tCLK + tSKEW2.
If tFRL is not met, D0 may be available either at tCLK + tSKEW2, or after
one more clock cycle delay at 2 tCLK + tSKEW2. The First-Read Latency
timing restrictions apply only when the FIFO has been empty (EF = LOW).
3. EF may be used to determine when the first data word D0 may be read.
D0 always is available on the next cycle after EF has gone HIGH.
Figure 9. Latency for the First Data Word After a
Reset Operation, With Simultaneous Read and Write
TIMING DIAGRAMS (cont’d)
512 x 18/1024 x 18 Synchronous FIFO
LH540215/25
25


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