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IDT72V82L15PA Datasheet(PDF) 8 Page - Integrated Device Technology

Part # IDT72V82L15PA
Description  3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO DUAL 512 x 9, DUAL 1,024 x 9 DUAL 2,048 x 9, DUAL 4,096 X 9
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT72V82L15PA Datasheet(HTML) 8 Page - Integrated Device Technology

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8
Commercial Temperature Range
IDT72V81/72V82/72V83/72V84/72V85
USAGE MODES:
Width Expansion
Word width may be increased simply by connecting the corresponding
input control signals of multiple FIFOs. Status flags (
EF, FF and HF) can be
detected from any one FIFO. Figure 13 demonstrates an 18-bit word width by
usingthetwoFIFOscontainedintheIDT72V81/72V82/72V83/72V84/72V85s.
Any word width can be attained by adding FIFOs (Figure 13).
Bidirectional Operation
Applications which require data buffering between two systems (each
system capable of Read and Write operations) can be achieved by pairing
IDT72V81/72V82/72V83/72V84/72V85s as shown in Figure 16. Both Depth
Expansion and Width Expansion may be used in this mode.
Data Flow-Through
Two types of flow-through modes are permitted, a read flow-through
and write flow-through mode. For the read flow-through mode (Figure 17), the
FIFO permits a reading of a single word after writing one word of data into an
empty FIFO. The data is enabled on the bus in (tWEF + tA) ns after the rising
edge of
W,calledthefirstwriteedge,anditremainsonthe busuntiltheRline
is raised from low-to-high, after which the bus would go into a three-state mode
after tRHZns. The
EFlinewouldhaveapulseshowingtemporarydeassertion
and then would be asserted.
In the write flow-through mode (Figure 18), the FIFO permits the writing
of a single word of data immediately after reading one word of data from a
full FIFO. The
Rline causes the FFto be deasserted but the Wline being low
causes it to be asserted again in anticipation of a new data word. On the rising
edgeof
W,thenewwordisloadedintheFIFO.TheWlinemustbetoggledwhen
FFisnotassertedtowritenewdataintheFIFOandtoincrementthewritepointer.
Compound Expansion
The two expansion techniques described above can be applied together
in a straightforward manner to achieve large FIFO arrays (see Figure 15).
Figure 12. Block Diagram of One 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9 FIFO Used in Single Device Mode
Figure 13. Block Diagram of One 512 x 18, 1,024 x 18, 2,048 x 18, 4,096 x 18 and 8,192 x 18 FIFO Memory Used in Width Expansion Mode
XIA
XIB
9
9
18
9
18
HFB
HFA
9
WRITE (
W)
FULL FLAG (
FFA)
RESET (
RS)
READ (
R)
EMPTY FLAG (
EFB)
RETRANSMIT (
RT)
DATA OUT (Q)
3966 drw 15
FIFO A
FIFO B
72V81/72V82/72V83
72V84/72V85
DATA
(D)
IN
WRITE (
W)
DATA IN (D)
FULL FLAG (
FF)
RESET (
RS)
9
READ (
R)
9
DATA OUT (Q)
EMPTY FLAG (
EF)
RETRANSMIT (
RT)
EXPANSION IN (
XI)
(
HF)
IDT
72V81
72V82
72V83
72V84
72V85
(HALF-FULL FLAG)
3966 drw 14
FIFO
A or B


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