CY7C1480V25
CY7C1482V25
CY7C1486V25
Document #: 38-05282 Rev. *H
Page 10 of 32
Notes
3. X = “Don't Care.” H = Logic HIGH, L = Logic LOW.
4. WRITE = L when any one or more Byte Write Enable signals and BWE = L or GW = L. WRITE = H when all Byte Write Enable signals, BWE, GW = H.
5. The DQ pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.
6. The SRAM always initiates a read cycle when ADSP is asserted, regardless of the state of GW, BWE, or BW
X
. Writes may occur only on subsequent clocks
after the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH before the start of the write cycle to enable the outputs to tri-state. OE is a
don't care for the remainder of the write cycle
7. OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle all data bits are tri-state when OE is
inactive or when the device is deselected, and all data bits behave as output when OE is active (LOW).
Truth Table
The truth table for CY7C1480V25, CY7C1482V25, and CY7C1486V25 follows.
[3, 4, 5, 6, 7]
Operation
Add. Used
CE
1
CE
2
CE
3
ZZ ADSP ADSC
ADV WRITE OE CLK
DQ
Deselect Cycle, Power Down
None
H
X
X
L
X
L
X
X
X
L-H Tri-State
Deselect Cycle, Power Down
None
L
L
X
L
L
X
X
X
X
L-H Tri-State
Deselect Cycle, Power Down
None
L
X
H
L
L
X
X
X
X
L-H Tri-State
Deselect Cycle, Power Down
None
L
L
X
L
H
L
X
X
X
L-H Tri-State
Deselect Cycle, Power Down
None
L
X
H
L
H
L
X
X
X
L-H Tri-State
Sleep Mode, Power Down
None
X
X
X
H
X
X
X
X
X
X
Tri-State
Read Cycle, Begin Burst
External
L
H
L
L
L
X
X
X
L
L-H
Q
Read Cycle, Begin Burst
External
L
H
L
L
L
X
X
X
H
L-H Tri-State
Write Cycle, Begin Burst
External
L
H
L
L
H
L
X
L
X
L-H
D
Read Cycle, Begin Burst
External
L
H
L
L
H
L
X
H
L
L-H
Q
Read Cycle, Begin Burst
External
L
H
L
L
H
L
X
H
H
L-H Tri-State
Read Cycle, Continue Burst
Next
X
X
X
L
H
H
L
H
L
L-H
Q
Read Cycle, Continue Burst
Next
X
X
X
L
H
H
L
H
H
L-H Tri-State
Read Cycle, Continue Burst
Next
H
X
X
L
X
H
L
H
L
L-H
Q
Read Cycle, Continue Burst
Next
H
X
X
L
X
H
L
H
H
L-H Tri-State
Write Cycle, Continue Burst
Next
X
X
X
L
H
H
L
L
X
L-H
D
Write Cycle, Continue Burst
Next
H
X
X
L
X
H
L
L
X
L-H
D
Read Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
H
L
L-H
Q
Read Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
H
H
L-H Tri-State
Read Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
L
L-H
Q
Read Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
H
H
L-H Tri-State
Write Cycle, Suspend Burst
Current
X
X
X
L
H
H
H
L
X
L-H
D
Write Cycle, Suspend Burst
Current
H
X
X
L
X
H
H
L
X
L-H
D
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