Industrial temperature range (–40°C to +85°C) is available
°
°
Green parts available, see ordering information
DESCRIPTION:
The IDT72V801/72V811/72V821/72V831/72V841/72V851/72V851 are
dual synchronous (clocked) FIFOs. The device is functionally equivalent to
two IDT72V201/72V211/72V221/72V231/72V241/72V251 FIFOs in a single
package with all associated control, data, and flag lines assigned to separate
pins.
Each of the two FIFOs (designated FIFO A and FIFO B) contained in the
IDT72V801/72V811/72V821/72V831/72V841/72V851 has a 9-bit input data
port (DA0 - DA8, DB0 - DB8) and a 9-bit output data port (QA0 - QA8,
QB0 - QB8). Each input port is controlled by a free-running clock (WCLKA,
WCLKB), and two Write Enable pins (WENA1, WENA2,
WENB1,
WENB2).
Data is written into each of the two arrays on every rising clock edge of the Write
Clock (WCLKA, WCLKB) when the appropriate Write Enable pins are
asserted.
The output port of each FIFO bank is controlled by its associated clock pin
(RCLKA, RCLKB) and two Read Enable pins (RENA1,
RENA2, RENB1,
RENB2).
The Read Clock can be tied to the Write Clock for single clock operation
or the two clocks can run asynchronous of one another for dual clock operation.
An Output Enable pin (OEA,
OEB)
is provided on the read port of each FIFO
for three-state output control.
Each of the two FIFOs has two fixed flags, Empty (EFA,
EFB)
and Full (FFA,
FFB).
Two programmable flags, Almost-Empty (PAEA,
PAEB)
and Almost-Full
(PAFA,
PAFB),
are provided for each FIFO bank to improve memory utilization.
If not programmed, the programmable flags default to Empty+7 for
PAEA
and
PAEB,
and Full-7 for
PAFA
and
PAFB.
The IDT72V801/72V811/72V821/72V831/72V841/72V851 architecture
lends itself to many flexible configurations such as:
• 2-level priority data buffering
• Bidirectional operation
• Width expansion
• Depth expansion
This FIFO is fabricated using IDT's high-performance submicron CMOS
technology.
FUNCTIONAL BLOCK DIAGRAM
WCLKA
WENA1
WENA2
DA
0
- DA
8
WCLKB
EFA
PAEA
WENB1
PAFA
LDA
WENB2
FFA
OFFSET REGISTER
FLAG
LOGIC
RAM ARRAY
256 x 9, 512 x 9,
1,024 x 9, 2,048 x 9,
4,096 x 9, 8,192 x 9
WRITE CONTROL
LOGIC
RAM ARRAY
256 x 9, 512 x 9,
1,024 x 9, 2,048 x 9,
4,096 x 9, 8,192 x 9
DB
0
- DB
8
LDB
INPUT REGISTER
WRITE CONTROL
LOGIC
INPUT REGISTER
OFFSET REGISTER
FLAG
LOGIC
EFB
PAEB
PAFB
FFB
WRITE POINTER
READ POINTER
READ CONTROL
LOGIC
WRITE POINTER
READ POINTER
READ CONTROL
LOGIC
OUTPUT REGISTER
RESET LOGIC
RESET LOGIC
OUTPUT REGISTER
RSA
OEA
QA
0
- QA
8
RCLKA
RENA1
RENA2
RSB
OEB
QB
0
- QB
8
RCLKB
RENB1
RENB2
4093 drw 01
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The TeraSync FIFO is a trademark of Integrated Device Technology, Inc.
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ADI Reference Circuit
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