White Electronic Designs
TRUTH TABLES
SYNCHRONOUS TRUTH TABLE
CEx# ADV
H
L
X
H
L
L
X
H
L
L
X
H
L
L
X
H
L
L
X
H
X
X
WE#
X
X
H
X
H
X
L
X
L
X
X
BWx#
X
X
X
X
X
X
L
L
H
H
X
OE#
X
X
L
L
H
H
X
X
X
X
X
CKE#
L
L
L
L
L
L
L
L
L
L
H
CK
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
Address Accessed
N/A
N/A
External Address
Next Address
External Address
Next Address
External Address
Next Address
N/A
Next Address
Current Address
WED2ZL361MS
Operation
Deselect
Continue Deselect
Begin Burst Read Cycle
Continue Burst Read Cycle
NOP/Dummy Read
Dummy Read
Begin Burst Write Cycle
Continue Burst Write Cycle
NOP/Write Abort
Write Abort
Ignore Clock
NOTES:
1.
X means “Don’t Care.”
2.
The rising edge of clock is symbolized by (
↑
)
3.
A continue deselect cycle can only be entered if a deselect cycle is executed first.
4.
WRITE# = L means Write operation in WRITE TRUTH TABLE.
WRITE# = H means Read operation in WRITE TRUTH TABLE.
5.
Operation finally depends on status of asynchronous input pins (ZZ and OE#).
6.
CEx# refers to the combination of CE1#, CE2 and CE2#.
WRITE TRUTH TABLE
WE#
H
L
L
L
L
L
L
BWa# BWb# BWc# BWd#
X
X
X
X
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
L
L
L
L
H
H
H
H
Operation
Read
Write Byte a
Write Byte b
Write Byte c
Write Byte d
Write All Bytes
Write Abort/NOP
NOTES:
1.
X means “Don’t Care.”
2.
All inputs in this table must meet setup and hold time around the
rising edge of CK (
↑
).
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
Oct, 2002
Rev. 5
3
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
