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CY7C1339G
Document #: 38-05520 Rev. *F Page 6 of 18
Truth Table
[2, 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
Snooze 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
Notes:
2. X = “Don't Care.” H = Logic HIGH, L = Logic LOW.
3. WRITE
= L when any one or more Byte Write enable signals (BW
A
, BW
B
, BW
C
, BW
D
) and BWE = L or GW= L. WRITE = H when all Byte write enable signals
(BW
A
, BW
B
, BW
C
, BW
D
), BWE, GW = H.
4. The DQ pins are controlled by the current cycle and the
OE
signal.
OE
is asynchronous and is not sampled with the clock.
5. CE
1
, CE
2
, and CE
3
are available only in the TQFP package. BGA package has only 2 chip selects CE
1
and CE
2
.
6. The SRAM always initiates a read cycle when ADSP
is asserted, regardless of the state of GW, BWE, or BW
[A: D]
. Writes may occur only on subsequent clocks
after the ADSP or with the assertion of ADSC. As a result,
OE
must be driven HIGH prior to the start of the write cycle to allow 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).
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