參數(shù)資料
型號(hào)： LH543611
廠(chǎng)商： Sharp Corporation
英文描述： 512 x 36 x 2 / 1024 x 36 x 2 Synchronous Bidirectional FIFO
中文描述： 512 × 36 x一千○二十四分之二× 36 × 2同步雙向先進(jìn)先出
文件頁(yè)數(shù)： 52/57頁(yè)
文件大?。?/td> 475K
代理商： LH543611
TIMING DIAGRAMS (cont’d)
t
RQS
t
ACK
t
AE
t
ACK
t
ACK
t
ACK
(CK )
(R/W )
(REQ )
(ACK )
(AE
1
)
A
CK
A
R/W
A
REQ
A
ACK
AE
2
RWS
t
Starting at the third cycle after entering the
'almost-empty' region, acknowledge
occurs on every third cycle to prevent underrun
of the empty condition.
Outside the 'almost-empty' region,
acknowledge is continuous
for a continuous request.
Indicates where a read would take place, if ACK were tied to EN.
3. REQ must be maintained HIGH with R/W stable throughout entire clock cycle for ACK to be generated.
4. When the REQ/ACK handshake is not used, ACK can be ignored,
and REQ may be tied HIGH or used as a second enable.
5. Parameters without parentheses apply to Port A. Parameters with parentheses apply to Port B.
NOTES:
1. For a FIFO access to occur, REQ and EN must be held HIGH for the required setup and hold times.
2. ACK can be tied directly to EN to directly gate FIFO accesses.
*
*
*
*
*
543611-42
1
2
Figure 40. Read Request/Acknowledge Handshake
LH543611/21
512 x 36 x 2/1024 x 36 x 2 BiFIFOs
52
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