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參數(shù)資料
| 型號(hào)： | IDT72V85L15PAG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | DRAM |
| 英文描述： | 3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO |
| 中文描述： | 8K X 9 BI-DIRECTIONAL FIFO, 15 ns, PDSO56 |
| 封裝： | GREEN, TSSOP-56 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 151K |
| 代理商： | IDT72V85L15PAG |
7
COMMERCIAL TEMPERATURE RANGE
IDT72V81/72V82/72V83/72V84/72V85 3.3V CMOS DUAL ASYNCHRONOUS FIFO
512 x 9, 1024 x 9, 2048 x 9, 4096 x 9, 8192 x 9
JULY 17, 2006
Figure 9. Half-Full Flag Timing
Figure 10. Expansion Out
Figure 11. Expansion In
OPERATING MODES:
Care must be taken to assure that the appropriate flag is monitored by each
system(i.e.
FF
is monitored on the device where
W
is used;
EF
is monitored on
the device where
R
is used).
Single Device Mode
A single IDT72V81/72V82/72V83/72V84/72V85 may be used when the
application requirements are for 512/1,024/2,048/4,096/8,192 words or less.
These FIFOs are in a Single Device Configuration when the Expansion In (
XI
)
control input is grounded (see Figure 12).
Depth Expansion
These devices can easily be adapted to applications when the requirements
are for greater than
512/1,024/2,048/4,096/8,192
words. Figure 14 demon-
strates a four-FIFO Depth Expansion using two IDT72V81/72V82/72V83/
72V84/72V85s. Any depth can be attained by adding additional IDT72V81/
72V82/72V83/72V84/72V85s. These FIFOs operate in the Depth Expansion
mode when the following conditions are met:
1. The first FIFO must be designated by grounding the First Load (
FL
) control
input.
2. All other FIFOs must have
FL
in the high state.
3. The Expansion Out (
XO
) pin of each device must be tied to the Expansion
In (
XI
) pin of the next device. See Figure 14.
4. External logic is needed to generate a composite Full Flag (
FF
) and Empty
Flag (
EF
). This requires the ORing of all
EF
s and ORing of all
FF
s (i.e. all
must be set to generate the correct composite
FF
or
EF
). See Figure 14.
5. The Retransmt (
RT
) function and Half-Full Flag (
HF
) are not available in
the Depth Expansion Mode.
W
XI
R
WRITE TO
FIRST PHYSICAL
LOCATION
READ FROM
FIRST PHYSICAL
LOCATION
t
XIS
t
XIR
t
XI
t
XIS
3966 drw 13
R
W
XO
3966 drw 12
WRITE TO
LAST PHYSICAL
LOCATION
t
XOL
t
XOH
READ FROM
LAST PHYSICAL
LOCATION
t
XOL
t
XOH
R
W
HF
t
RHF
3966 drw 11
HALF-FULL OR LESS
MORE THAN HALF-FULL
HALF-FULL OR LESS
t
WHF
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