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LH540203 Datasheet(PDF) 5 Page - Sharp Corporation

Part # LH540203
Description  CMOS 2048 x 9 Asynchronous FIFO
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH540203 Datasheet(HTML) 5 Page - Sharp Corporation

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OPERATIONAL MODES
Standalone Configuration
When depth cascading is not required for a given
application, the LH540203 is placed in standalone mode
by tying the Expansion In input (XI) to ground. This
input is internally sampled during a reset operation. (See
Table 1.)
Width Expansion
Word-width expansion is implemented by placing mul-
tiple LH540203 devices in parallel. Each LH540203
should be configured for standalone mode. In this ar-
rangement, the behavior of the status flags is identical for
all devices; so, in principle, a representative value for
each of these flags could be derived from any one device.
In practice, it is better to derive ‘composite’ flag values
using external logic, since there may be minor speed
variations between different actual devices. (See Figures
4, 5, and 6.)
WRITE
DATA IN
D0 - D8
9
FULL FLAG
RESET
XI
RT
RETRANSMIT
EMPTY FLAG
9
READ
HF
LH540203
W
FF
RS
R
EF
DATA OUT
Q0 - Q8
540203-17
Figure 4. Standalone FIFO (2048
× 9)
18
WRITE
FULL FLAG
RESET
9
READ
EMPTY FLAG
R
EF
XI
RT
R
W
540203-18
RS
RETRANSMIT
RT
XI
HF
W
FF
RS
9
18
9
HF
9
LH540203
LH540203
DATA IN
D0 - D17
DATA OUT
Q0 - Q17
Figure 5. FIFO Word-Width Expansion (2048
× 18)
CMOS 2048
× 9 Asynchronous FIFO
LH540203
5


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