Cypress CY7C1473BV33 Manual Do Utilizador
CY7C1471BV33
CY7C1473BV33, CY7C1475BV33
Document #: 001-15029 Rev. *B
Page 11 of 32
The truth table for CY7C1471BV33, CY7C1473BV33, and CY7C1475BV33 follows.
Truth Table
Operation
Address
Used
CE
1
CE
2
CE
3
ZZ
ADV/LD
WE
BW
X
OE
CEN
CLK
DQ
Deselect Cycle
None
H
X
X
L
L
X
X
X
L
L->H
Tri-State
Deselect Cycle
None
X
X
H
L
L
X
X
X
L
L->H
Tri-State
Deselect Cycle
None
X
L
X
L
L
X
X
X
L
L->H
Tri-State
Continue Deselect Cycle
None
X
X
X
L
H
X
X
X
L
L->H
Tri-State
Read Cycle
(Begin Burst)
(Begin Burst)
External
L
H
L
L
L
H
X
L
L
L->H Data Out (Q)
Read Cycle
(Continue Burst)
(Continue Burst)
Next
X
X
X
L
H
X
X
L
L
L->H Data Out (Q)
NOP/Dummy Read
(Begin Burst)
(Begin Burst)
External
L
H
L
L
L
H
X
H
L
L->H
Tri-State
Dummy Read
(Continue Burst)
(Continue Burst)
Next
X
X
X
L
H
X
X
H
L
L->H
Tri-State
Write Cycle
(Begin Burst)
(Begin Burst)
External
L
H
L
L
L
L
L
X
L
L->H
Data In (D)
Write Cycle
(Continue Burst)
(Continue Burst)
Next
X
X
X
L
H
X
L
X
L
L->H
Data In (D)
NOP/Write Abort
(Begin Burst)
(Begin Burst)
None
L
H
L
L
L
L
H
X
L
L->H
Tri-State
Write Abort
(Continue Burst)
(Continue Burst)
Next
X
X
X
L
H
X
H
X
L
L->H
Tri-State
Ignore Clock Edge (Stall)
Current
X
X
X
L
X
X
X
X
H
L->H
-
Sleep Mode
None
X
X
X
H
X
X
X
X
X
X
Tri-State
Notes
1. X = “Don't Care.” H = Logic HIGH, L = Logic LOW. BW
X
= L signifies at least one Byte Write Select is active, BW
X
= Valid signifies that the desired Byte Write Selects
on page 12 for details.
2. Write is defined by BW
X
, and WE. See section
3. When a Write cycle is detected, all IOs are tri-stated, even during Byte Writes.
4. The DQs and DQP
4. The DQs and DQP
X
pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.
5. CEN = H, inserts wait states.
6. Device powers up deselected with the IOs in a tri-state condition, regardless of OE.
7. OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle DQs and DQP
6. Device powers up deselected with the IOs in a tri-state condition, regardless of OE.
7. OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle DQs and DQP
X
= tri-state when OE is
inactive or when the device is deselected, and DQs and DQP
X
= data when OE is active.