WED2ZL361MS
White Electronic Designs
TRUTH TABLES
SYNCHRONOUS TRUTH TABLE
CEx# ADV WE# BWx# OE# CKE# CK Address Accessed
Operation
H
X
L
L
H
L
X
X
H
X
H
X
L
X
X
X
X
X
X
L
X
X
L
L
L
L
L
L
L
L
L
L
L
H
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
↑
N/A
Deselect
Continue Deselect
Begin Burst Read Cycle
Continue Burst Read Cycle
NOP/Dummy Read
Dummy Read
N/A
External Address
Next Address
External Address
Next Address
External Address
Next Address
N/A
X
L
H
L
L
H
H
X
X
X
X
X
X
L
H
L
Begin Burst Write Cycle
Continue Burst Write Cycle
NOP/Write Abort
X
L
H
L
X
L
L
H
H
X
X
X
H
X
X
X
Next Address
Current Address
Write Abort
Ignore Clock
NOTES:
1.
2.
3.
4.
X means “Don’t Care.”
The rising edge of clock is symbolized by ( ↑ )
A continue deselect cycle can only be entered if a deselect cycle is executed first.
WRITE# = L means Write operation in WRITE TRUTH TABLE.
WRITE# = H means Read operation in WRITE TRUTH TABLE.
Operation finally depends on status of asynchronous input pins (ZZ and OE#).
CEx# refers to the combination of CE1#, CE2 and CE2#.
5.
6.
WRITE TRUTH TABLE
WE# BWa# BWb# BWc# BWd#
Operation
Read
H
L
L
L
L
L
L
X
L
X
H
L
X
H
H
L
X
H
H
H
L
Write Byte a
Write Byte b
H
H
H
L
H
H
L
Write Byte c
H
L
Write Byte d
L
Write All Bytes
Write Abort/NOP
H
H
H
H
NOTES:
1.
2.
X means “Don’t Care.”
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 ]
