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參數(shù)資料
| 型號： | LH5491 |
| 廠商： | Sharp Corporation |
| 英文描述： | Cascadable 64 x 8 FIFO Cascadable 64 x 9 FIFO |
| 中文描述： | 級聯(lián)64 × 8的FIFO級聯(lián)64 × 9先進先出 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 125K |
| 代理商： | LH5491 |
FIFO EXPANSION (cont’d)
FIFOs are expandable in depth and width. However,
in forming wider words, external logic is required to gen-
erate composite Input Ready and Output Ready flags.
This is due to the variation of delays of the FIFOs. For
example, the circuit of Figure 16 uses simple AND gates
as the external IR and OR generators. More complex logic
may be required if fallthrough and bubblethrough pulses
are needed by the external system.
FIFOs can be easily cascaded to any desired depth,
as illustrated in Figure 17. The handshaking and associ-
ated timing between the FIFOs are handled by the inher-
ent timing of the devices.
NOTES:
1.
When the memory is empty, the last word read remains on the out-
puts until Master Reset is strobed, or a new data word bubbles
through to the output. However, OR remains LOW, indicating
that the data word at the output is not valid.
2.
When the output data word changes as a result of a pulse on SO,
the OR signal always goes LOW before the output data word
changes and stays LOW until a new data word has appeared at
the outputs. Anytime OR is HIGH, there is valid stable data on
the outputs.
3.
All SHARP FIFOs can be cascaded with other SHARP FIFOs of
the same architecture (i.e., 64
×
8/9 with 64
×
8/9). However,
they may not cascade with FIFOs from other manufacturers.
5481-17
SI
IR
DI
0
DI
1
DI
2
DI
3
DI
4
DI
5
DI
6
DI
7
DI
8
OR
SO
DO
0
DO
1
DO
2
DO
3
DO
4
DO
5
DO
6
DO
7
DO
8
256 x 8/9
MR
SI
IR
DI
0
DI
1
DI
2
DI
3
DI
4
DI
5
DI
6
DI
7
DI
8
OR
SO
DO
0
DO
1
DO
2
DO
3
DO
4
DO
5
DO
6
DO
7
DO
8
64 x 8/9
MR
HF/AFE
SHIFT IN
INPUT READY
DATA IN
OUTPUT READY
SHIFT OUT
DATA OUT
MR
HF/AFE
Figure 17. 128
×
8/9 Configuration
LH5481/91
64
×
8 / 64
×
9 FIFO
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LH5491D-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x9 Asynchronous FIFO |
| LH5491D25 | 制造商:SHARP 功能描述:* |
| LH5491D-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x9 Asynchronous FIFO |
| LH5491D-35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x9 Asynchronous FIFO |
| LH5491U-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x9 Asynchronous FIFO |
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