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Cypress Semiconductor FLEx36 CY7C0850AV Manual de usuario Pagina 19

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CY7C0850AV,CY7C0851V/CY7C0851AV
CY7C0852V/CY7C0852AV
CY7C0853V/CY7C0853AV
Document #: 38-06070 Rev. *K Page 19 of 36
Figure 10. Bank Select Read
[31, 32]
Figure 11. Read-to-Write-to-Read (OE = LOW)
[30, 33, 34, 35, 36]
Switching Waveforms (continued)
Q
3
Q
1
Q
0
Q
2
A
0
A
1
A
2
A
3
A
4
A
5
Q
4
A
0
A
1
A
2
A
3
A
4
A
5
t
SA
t
HA
t
SC
t
HC
t
SA
t
HA
t
SC
t
HC
t
SC
t
HC
t
SC
t
HC
t
CKHZ
t
DC
t
DC
t
CD2
t
CKLZ
t
CD2
t
CD2
t
CKHZ
t
CKLZ
t
CD2
t
CKHZ
t
CKLZ
t
CD2
t
CH2
t
CL2
t
CYC2
CLK
ADDRESS
(B1)
CE
(B1)
DATA
OUT(B2)
DATA
OUT(B1)
ADDRESS
(B2)
CE
(B2)
t
CYC2
t
CL2
t
CH2
t
HC
t
SC
t
HW
t
SW
t
HA
t
SA
t
HW
t
SW
t
CD2
t
CKHZ
t
SD
t
HD
NO
OPERATION WRITEREAD READ
CLK
CE
R/W
ADDRESS
DATA
IN
DATA
OUT
A
n
A
n+1
A
n+2
A
n+2
D
n+2
A
n+3
A
n+4
Q
n
Q
n+3
Q
n+1
t
CD2
t
CD2
t
CKLZ
Notes
31. In this depth-expansion example, B1 represents Bank #1 and B2 is Bank #2; each bank consists of one Cypress CY7C0851V/CY7C0851AV/CY7C0852V/CY7C0852AV
device from this data sheet. ADDRESS
(B1)
= ADDRESS
(B2)
.
32. ADS
= CNTEN= B0 – B3 = OE = LOW; MRST = CNTRST = CNT/MSK = HIGH.
33. Output state (HIGH, LOW, or high-impedance) is determined by the previous cycle control signals.
34. During “No Operation,” data in memory at the selected address may be corrupted and should be rewritten to ensure data integrity.
35. CE
0
= OE = B0 – B3 = LOW; CE
1
= R/W = CNTRST = MRST = HIGH.
36. CE
0
= B0 – B3 = R/W = LOW; CE
1
= CNTRST = MRST = CNT/MSK = HIGH. When R/W first switches low, since OE = LOW, the Write operation cannot be completed
(labelled as no operation). One clock cycle is required to three-state the I/O for the Write operation on the next rising edge of CLK.
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