CY7C1359A/GVT71256T18
Truth Table[5, 6, 7, 8, 9, 10, 11]
Address
Used
Operation
CE CE2 CE2 ADSP ADSC
ADV WRITE OE
CLK
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
L-H
DQ
High-Z
High-Z
High-Z
High-Z
High-Z
Q
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
Deselected Cycle, Power Down
READ Cycle, Begin Burst
None
None
H
L
X
X
H
X
H
L
X
L
X
L
L
X
X
L
X
X
X
X
X
X
X
X
X
X
L
X
X
X
X
X
X
X
L
X
X
X
X
X
L
None
L
X
L
L
None
L
H
H
L
None
L
X
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
L
External
External
External
External
External
Next
L
X
X
L
READ Cycle, Begin Burst
L
L
L
H
X
L
High-Z
D
WRITE Cycle, Begin Burst
READ Cycle, Begin Burst
L
L
H
H
H
H
H
X
X
H
X
H
H
X
X
H
X
L
L
L
H
H
H
H
H
H
L
Q
READ Cycle, Begin Burst
L
L
L
H
L
High-Z
Q
READ Cycle, Continue Burst
READ Cycle, Continue Burst
READ Cycle, Continue Burst
READ Cycle, Continue Burst
WRITE Cycle, Continue Burst
WRITE Cycle, Continue Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
READ Cycle, Suspend Burst
WRITE Cycle, Suspend Burst
WRITE Cycle, Suspend Burst
X
X
H
H
X
H
X
X
H
H
X
H
X
X
X
X
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
H
H
Next
L
H
L
High-Z
Q
Next
L
Next
L
H
X
X
L
High-Z
D
Next
L
Next
L
L
D
Current
Current
Current
Current
Current
Current
H
H
H
H
H
H
H
H
H
H
L
Q
H
L
High-Z
Q
H
X
X
High-Z
D
L
D
Partial Truth Table for READ/WRITE[12]
Function
READ
GW
BWE
WEH
WEL
H
H
H
H
L
H
L
L
L
X
X
H
L
X
H
H
L
READ
WRITE one byte
WRITE all bytes
L
WRITE all bytes
X
X
Notes:
7. X means “Don’t Care.” H means logic HIGH. L means logic LOW. WRITE = L means [BWE + WEL*WEH]*GW equals LOW. WRITE = H means [BWE +
WEL*WEH]*GW equals HIGH. It is assumed in this truth table that DEN is LOW.
8. WEL enables write to DQ1–DQ9. WEH enables write to DQ10–DQ18.
9. All inputs except OE must meet set-up and hold times around the rising edge (LOW to HIGH) of CLK.
10. Suspending burst generates wait cycle.
11. ADSP LOW along with chip being selected always initiates a READ cycle at the L-H edge of CLK. A WRITE cycle can be performed by setting WRITE LOW for
the CLK L-H edge of the subsequent wait cycle. Refer to WRITE timing diagram for clarification.
12. X means “don’t care.” H means logic HIGH. L means logic LOW. It is assumed in this truth table that chip is selected and ADSP is HIGH along with DEN being LOW.
Document #: 38-05120 Rev. **
Page 6 of 24
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