參數(shù)資料
型號: LH540235
廠商: Sharp Corporation
英文描述: 2048 x 18 / 4096 x 18 Synchronous FIFOs
中文描述: 2048 ×四千零九十六分之十八× 18同步FIFO的
文件頁數(shù): 30/46頁
文件大?。?/td> 369K
代理商: LH540235
540235-24
Q
0
- Q
17
REN
RCLK
PAF
OE
WEN
D
0
- D
17
WCLK
DATA WRITE
DATA WRITE
DATA READ
LOW
DATA IN
OUTPUT REGISTER
NEXT
DATA READ
NO WRITE
t
SKEW1(1)
t
DS
t
DS
t
SKEW1(1)
t
PAFS
t
PAFS
t
PAFS
t
ENS
t
ENH
t
ENS
t
ENH
t
A
t
A
NO WRITE
NOTES:
1. t
is the minimum time between a rising RCLK edge and a
rising WCLK edge for PAF to change predictably during the current
clock cycle. If the time between the rising edge of RCLK and the
rising edge of WCLK is less than t
, then it is not guaranteed
that PAF will change state until the next following WCLK edge.
2. PAF offset = p. Number of data words written into FIFO already = 2047 - p
for the LH540235 and 4095 - p for the LH540245.
3. The internal state of the FIFO:
At A
Enhanced Operating Mode Timing Diagram
B
C
A
C
B
At , 2048 - p words in FIFO for LH540235 and 4096 - p words in FIFO for LH540245.
At , again 2047 - p words in FIFO for LH540235 and 4095 - p words in FIFO for LH540245.
Figure 17. Programmable-Almost-Full-Flag Timing,
When Synchronous (Enhanced Operating Mode)
TIMING DIAGRAMS (cont’d)
LH540235/45
2048 x 18/4096 x 18 Synchronous FIFOs
30
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