參數(shù)資料
型號: CY7C43662AV
廠商: Cypress Semiconductor Corp.
英文描述: 3.3V 4K x36 x2 Bidirectional Synchronous FIFO(3.3V 4K x36 x2 雙向同步先進先出)
中文描述: 3.3 4K的x36 x2雙向同步FIFO(3.3 4K的x36 x2雙向同步先進先出)
文件頁數(shù): 29/30頁
文件大小: 458K
代理商: CY7C43662AV
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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