GS816018/32/36BT-250/200/150
Synchronous Truth Table
Operation
State
Address
Used
2
3
4
Diagram
E1
ADSP ADSC ADV
E
W
DQ
5
Key
Deselect Cycle, Power Down
Deselect Cycle, Power Down
Deselect Cycle, Power Down
Read Cycle, Begin Burst
None
None
X
X
H
L
X
X
L
L
X
L
X
X
X
X
X
X
L
X
X
X
X
F
T
F
F
T
T
F
F
T
T
High-Z
F
F
T
T
T
X
X
X
X
X
X
X
X
High-Z
None
X
L
L
H
L
High-Z
External
External
External
Next
R
X
L
Q
Q
D
Q
Q
D
D
Q
Q
D
D
Read Cycle, Begin Burst
Write Cycle, Begin 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
Write Cycle, Suspend Burst
Write Cycle, Suspend Burst
R
L
L
X
H
X
H
X
H
X
H
H
H
H
X
H
X
H
X
H
X
W
L
CR
CR
CW
CW
H
H
H
H
H
H
H
H
Next
L
Next
L
Next
L
Current
Current
Current
Current
H
H
H
H
Notes:
1. X = Don’t Care, H = High, L = Low
2. E = T (True) if E2 = 1 and E3 = 0; E = F (False) if E2 = 0 or E3 = 1
3. W = T (True) and F (False) is defined in the Byte Write Truth Table preceding.
4. G is an asynchronous input. G can be driven high at any time to disable active output drivers. G low can only enable active drivers (shown
as “Q” in the Truth Table above).
5. All input combinations shown above are tested and supported. Input combinations shown in gray boxes need not be used to accomplish
basic synchronous or synchronous burst operations and may be avoided for simplicity.
6. Tying ADSP high and ADSC low allows simple non-burst synchronous operations. See BOLD items above.
7. Tying ADSP high and ADV low while using ADSC to load new addresses allows simple burst operations. See ITALIC items above.
Rev: 1.03 9/2005
9/24
© 2004, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
GSI [ GSI TECHNOLOGY ]
