參數(shù)資料
型號(hào)： CY7C43682AV
廠商： Cypress Semiconductor Corp.
英文描述： 3.3V 16K x36 x2 Bidirectional Synchronous FIFO(3.3V 16K x36 x2 雙向同步先進(jìn)先出)
中文描述： 3.3 16K的x36 x2雙向同步FIFO（3.3 16K的x36 x2雙向同步先進(jìn)先出）
文件頁(yè)數(shù)： 29/30頁(yè)
文件大?。?/td> 458K
代理商： CY7C43682AV
CY7C43642AV
CY7C43662AV/CY7C43682AV
29
PRELIMINARY
t.
Table 4. FIFO1 Flag Operation (CY Standard and FWFT Modes)
Number of Words in FIFO Memory
[45, 46, 47, 48]
Synchronized to CLKA
Synchronized to CLKB
CY7C43642AV
0
CY7C43662AV
0
CY7C43682AV
0
EFB/ORB
L
AEB
L
AFA
H
FFA/IRA
H
1 TO X1
1 TO X1
1 TO X1
H
L
H
H
(X1+1) to
[1024
–
(Y1+1)]
(X1+1) to
[4096
–
(Y1+1)]
(X1+1) to
[16384
–
(Y1+1)]
H
H
H
H
(1024
–
Y1) to
1023
(4096
–
Y1) to
4095
(16384
–
Y1) to
16383
H
H
L
H
1024
4096
16384
H
H
L
L
Table 5. FIFO2 Flag Operation (CY Standard and FWFT modes)
Number of Words in FIFO Memory
[46, 47, 49, 50]
Synchronized to CLKA
Synchronized to CLKB
CY7C43642AV
0
CY7C43662AV
0
CY7C43682AV
0
EFB/ORA
L
AEA
L
AFB
H
FFA/IRA
H
1 TO X2
1 TO X2
1 TO X2
H
L
H
H
(X2+1) to
[1024
–
(Y2+1)]
(X2+1) to
[4096
–
(Y2+1)]
(X2+1) to
[16384
–
(Y2+1)]
H
H
H
H
(1024
–
Y2) to 1023
(4096
–
Y2) to 4095
(16384
–
Y2) to
16383
H
H
L
H
1024
4096
16384
H
H
L
L
Notes:
45. X1 is the almost-empty offset for FIFO1 used by AEB. Y1 is the almost-full offset for FIFO1 used by AFA. Both X1 and Y1 are selected during a FIFO1 reset
or port A programming.
46. When a word loaded to an empty FIFO is shifted to the output register, its previous FIFO memory location is free.
47. Data in the output register does not count as a
“
word in FIFO memory
”
. Since in FWFT mode, the first word written to an empty FIFO goes unrequested to
the output register (no read operation necessary), it is not included in the FIFO memory count.
48. The ORB and IRA functions are active during FWFT mode; the EFB and FFA functions are active in CY Standard mode.
49. X2 is the almost-empty offset for FIFO2 used by AEA. Y2 is the almost-full offset for FIFO2 used by AFB. Both X2 and Y2 are selected during a FIFO2 reset
or port A programming.
50. The ORA and IRB functions are active during FWFT mode; the EFA and FFB functions are active in CY Standard mode.
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