Cypress CY7C1992BV18 Manual De Usuario
CY7C1392BV18, CY7C1992BV18
CY7C1393BV18, CY7C1394BV18
CY7C1393BV18, CY7C1394BV18
Document #: 38-05623 Rev. *D
Page 25 of 31
Switching Waveforms
Figure 5. Read/Write/Deselect Sequence
K
1
2
3
4
5
6
7
8
K
LD
R/W
A
Q
D
C
C#
READ
(burst of 2)
(burst of 2)
READ
(burst of 2)
(burst of 2)
READ
(burst of 2)
(burst of 2)
WRITE
(burst of 2)
(burst of 2)
WRITE
(burst of 2)
(burst of 2)
t KHCH
t
KHCH
NOP
NOP
CQ
CQ#
tKH
tKHKH
tCO
tKL
tCYC
t
tHC
tSA
tHA
tSD
tHD
tSD
tHD
tCLZ
tDOH
SC
tKH
tKHKH
tKL
tCYC
tCQD
tCCQO
tCQOH
tCCQO
tCQOH
DON’T CARE
UNDEFINED
A0
A1
A2
A3
A4
D20
D21
D30
D31
Q40
Q11
Q10
Q41
Q00
Q01
tCQDOH
tCHZ
Notes
26. Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, that is, A0+1.
27. Outputs are disabled (High-Z) one clock cycle after a NOP.
28. In this example, if address A4 = A3, then data Q40 = D30 and Q41 = D31. Write data is forwarded immediately as read results. This note applies to the whole diagram.
27. Outputs are disabled (High-Z) one clock cycle after a NOP.
28. In this example, if address A4 = A3, then data Q40 = D30 and Q41 = D31. Write data is forwarded immediately as read results. This note applies to the whole diagram.