AS7C33512PFS32A
AS7C33512PFS36A
®
Write enable truth table (per byte)
Function
GWE BWE
BWa
X
BWb
X
BWc
BWd
X
L
H
H
H
H
H
X
L
L
L
H
L
X
L
Write All Bytes
L
L
L
Write Byte a
L
H
H
L
H
Write Byte c and d
H
H
L
X
X
X
H
X
Read
H
H
H
Key: X = don’t care, L = low, H = high, n = a, b, c, d; BWE, BWn = internal write signal.
Asynchronous Truth Table
Operation
Snooze mode
ZZ
H
L
OE
X
I/O Status
High-Z
L
Dout
Read
L
H
High-Z
Write
L
X
Din, High-Z
High-Z
Deselected
L
X
Notes:
1. X means “Don’t Care”
2. ZZ pin is pulled down internally
3. For write cycles that follows read cycles, the output buffers must be disabled with OE, otherwise data bus contention will occur.
4. Snooze mode means power down state of which stand-by current does not depend on cycle times
5. Deselected means power down state of which stand-by current depends on cycle times
Burst sequence table
Interleaved burst address (LBO = 1)
Linear burst address (LBO = 0)
A1 A0
0 0
A1 A0
0 1
A1 A0
1 0
A1 A0
1 1
A1 A0
0 0
A1 A0
0 1
A1 A0
1 0
A1 A0
1 1
Starting Address
First Increment
Second Increment
Third Increment
Starting Address
First Increment
Second Increment
Third Increment
0 1
0 0
1 1
1 0
0 1
1 0
1 1
0 0
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 1
1 0
0 1
0 0
1 1
1 0
0 1
1 0
12/23/04, v 2.6
Alliance Semiconductor
6 of 19
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
