IDT72251 IDT [Integrated Device Technology], IDT72251 Datasheet - Page 16

• Manufacturer Part Number: IDT72251
• Description: CMOS SyncFIFOO 8192 X 9
• Manufacturer: IDT [Integrated Device Technology]

IDT72251 CMOS SyncFIFO
8192 x 9
OPERATING CONFIGURATIONS
SINGLE DEVICE CONFIGURATION - A single IDT72251
may be used when the application requirements are for 8192
words or less. When the IDT72251 is in a Single Device
WIDTH EXPANSION CONFIGURATION - Word width may
be increased simply by connecting the corresponding input
controls signals of multiple devices. A composite flag should
be created for each of the end-point status flags (
The partial status flags (
one device. Figure 15 demonstrates a 18-bit word width by
WRITE ENABLE2/LOAD (WEN2/
DATA IN (D)
PROGRAMMABLE ALMOST FULL (
WRITE ENABLE 2/LOAD (WEN2/
WRITE ENABLE1 (
WRITE CLOCK (WCLK)
PROGRAMMABLE (
AE
FULL FLAG (
WRITE ENABLE 1 (
FULL FLAG (
18
WRITE CLOCK (WCLK)
and
AF
READ ENABLE 2 (
DATA IN (D
FULL FLAG (
Figure 14. Block Diagram of Single 8192 x 9 Synchronous FIFO
) can be detected from any
9
Figure 15. Block Diagram of 8192 x 18 Synchronous FIFO
) #1
) #2
)
)
)
RESET (
0
Used in a Width Expansion Configuration
- D
72251
IDT
8
)
)
)
)
)
EF
and
)
)
FF
9
).
5.14
72251
IDT
Configuration, the Read Enable 2 (
grounded (see Figure 14). In this configuration, the Write
Enable 2/Load (WEN2/
pin operates as a control to load and read the programmable
flag offsets.
using two IDT72251. Any word width can be attained by
adding additional IDT72251s.
the Read Enable 2 (
Figure 15). In this configuration, the Write Enable 2/Load
(WEN2/
as a control to load and read the programmable flag offsets.
9
READ ENABLE 2 (
RESET (
READ ENABLE 2 (
When the IDT72251is in a Width Expansion Configuration,
LD
RESET (
) pin is set LOW at Reset so that the pin operates
72251
READ CLOCK (RCLK)
READ ENABLE 1 (
OUTPUT ENABLE (
DATA OUT (Q
EMPTY FLAG (
PROGRAMMABLE ALMOST EMPTY (
IDT
)
EMPTY FLAG (
EMPTY FLAG (
)
REN2
PROGRAMMABLE (
READ CLOCK (RCLK)
READ ENABLE (
OUTPUT ENABLE (
LD
9
)
)
0
) control input can be grounded (see
) pin is set LOW at Reset so that the
- Q
DATA OUT (Q)
)
8
COMMERCIAL TEMPERATURE RANGES
)
)
REN2
)
) #2
) #1
)
) control input can be
)
)
18
)
3545 drw 16
3545 drw 17
16