LH540203D SHARP [Sharp Electrionic Components], LH540203D Datasheet - Page 7

• Manufacturer Part Number: LH540203D
• Description: CMOS 2048X9 ASYNCHRONOUS FIFO
• Manufacturer: SHARP [Sharp Electrionic Components]

CMOS 2048
OPERATIONAL MODES (cont’d)
Compound FIFO Expansion
cascading may be implemented easily by operating
groups of depth-cascaded FIFOs in parallel.
Bidirectional FIFO Operation
be implemented by operating LH540203 devices in par-
allel, but in opposite directions. The Data In inputs of each
A combination of word-width expansion and depth
Bidirectional data buffering between two systems may
DATA IN
R
W
RS
9 Asynchronous FIFO
D
DEPTH EXPANSION
0
- D
SYSTEM A
LH540203
N-1
BLOCK
Q
Ra
Wa
FFa
EFa
RS
HFa
RTa
0
- Q
8
Figure 8. Bidirectional FIFO Operation
Figure 7. Compound FIFO Expansion
D
9
- D
Qa
Da
N-1
0 - 8
0 - 8
DEPTH EXPANSION
(2048 9 2)
LH540203
LH540203
LH540203
BLOCK
D
XI
Q
XI
18
0
- Q
LH540203 are tied to the corresponding Data Out outputs
of another LH540203, which is operating in the opposite
direction, to form a single bidirectional bus interface. Care
must be taken to assure that the appropriate read, write,
and flag signals are routed to each system. Both word-
width expansion and depth cascading may be used in
bidirectional applications.
- D
17
N-1
Qb
Db
0 - 8
0 - 8
Q
0
D
- Q
DEPTH EXPANSION
N-9
Rb
EFb
HFb
RTb
Wb
FFb
RS
N-10
- D
LH540203
SYSTEM B
N-1
BLOCK
Q
0
- Q
ARRAY STORES
N-BIT WORDS.
N-1
DATA OUT
LH540203
540203-20
540203-21
7