lh5496 Sharp Microelectronics of the Americas, lh5496 Datasheet - Page 12

• Manufacturer Part Number: lh5496
• Description: Cmos Fifo
• Manufacturer: Sharp Microelectronics of the Americas

LH5496/96H
OPERATIONAL MODES
Single Device Configuration
application, the device is placed in Single mode by tying
the Expansion In pin (XI) to ground. This pin is internally
sampled during reset.
12
When depth expansion is not required for the given
DATA IN
FULL FLAG
RESET
WRITE
18
FULL FLAG
DATA IN
D
WRITE
RESET
0
9
RS
W
FF
- D
8
Figure 18. FIFO Width Expansion (512 18)
LH5496/96H
Figure 17. Single FIFO (512 9)
9
W
RS
FF
XI
HF
R
RT
9
LH5496/96H
HF
RS
9
W
Width Expansion
tiple LH5496/96H devices in parallel. Each LH5496/96H
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
17 and 18.)
XI
Word-width expansion is implemented by placing mul-
LH5496/96H
RT
EF
9
R
HF
XI
DATA OUT
READ
EMPTY FLAG
RETRANSMIT
R
EF
RT
9
Q
0
- Q
8
READ
EMPTY FLAG
RETRANSMIT
18
CMOS 512
DATA OUT
9 FIFO
5496-17
5496-18