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參數(shù)資料
| 型號： | IDT7284L20PAI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | FIFO |
| 英文描述： | 4K X 9 BI-DIRECTIONAL FIFO, 20 ns, PDSO56 |
| 封裝： | TSSOP-56 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 143K |
| 代理商： | IDT7284L20PAI |
7
IDT
IDT7280/81/82
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 IDT7280/7281/7282/7283/7284/7285 may be used when the
application requirements are for 256/512/1,024/2,048/4,096/8,192 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 require-
ments are for greater than 256/512/1,024/2,048/4,096/8,192 words. Figure
14 demonstrates a four-FIFO Depth Expansion using two IDT7280/7281/
7282/7283/7284/7285s. Any depth can be attained by adding additional
IDT7280/7281/7282/7283/7284/7285s. 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
FLin 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 EFs and ORing of all
FFs (i.e. all must be set to generate the correct composite FF or EF).
See Figure 14.
5. The Retransmit (
RT) function and Half-Full Flag (HF) are not available
in the Depth Expansion Mode.
R
W
HF
tRHF
3208 drw 11
HALF-FULL OR LESS
MORE THAN HALF-FULL
HALF-FULL OR LESS
tWHF
R
W
XO
3208 drw 12
WRITE TO
LAST PHYSICAL
LOCATION
tXOL
tXOH
READ FROM
LAST PHYSICAL
LOCATION
tXOL
tXOH
W
XI
R
3208 drw 13
WRITE TO
FIRST PHYSICAL
LOCATION
READ FROM
FIRST PHYSICAL
LOCATION
tXIS
tXIR
tXI
tXIS
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