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LH540205 데이터시트(PDF) 5 Page - Sharp Corporation

부품명 LH540205
상세설명  CMOS 8192 x 9 Asynchronous FIFO
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제조업체  SHARP [Sharp Corporation]
홈페이지  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH540205 데이터시트(HTML) 5 Page - Sharp Corporation

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OPERATIONAL MODES
Standalone Configuration
When depth cascading is not required for a given
application, the LH540205 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 LH540205 devices in parallel. Each LH540205
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
3 and 4.)
WRITE
DATA IN
D0 - D8
9
FULL FLAG
RESET
XI
RT
RETRANSMIT
EMPTY FLAG
9
READ
HF
LH540205
W
FF
RS
R
EF
DATA OUT
Q0 - Q8
540205-17
Figure 3. Standalone FIFO (8192
× 9)
18
WRITE
FULL FLAG
RESET
9
READ
EMPTY FLAG
R
EF
XI
RT
R
W
540205-18
RS
RETRANSMIT
RT
XI
HF
W
FF
RS
9
18
9
HF
9
LH540205
LH540205
DATA IN
D0 - D17
DATA OUT
Q0 - Q17
Figure 4. FIFO Word-Width Expansion (8192
× 18)
CMOS 8192
× 9 Asynchronous FIFO
LH540205
5


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