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eorex
EM48AM1684VTB
Apr. 2007
www.eorex.com
Burst Type (A3)
Burst Length
A2
A1
A0
Sequential Addressing
Interleave Addressing
X
X
0
0 1
0 1
2
X
X
0
1 0
1 0
X
0
0
0 1 2 3
0 1 2 3
X
0
1
1 2 3 0
1 0 3 2
X
1
0
2 3 0 1
2 3 0 1
4
X
1
1
3 0 1 2
3 2 1 0
0
0
0
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0
0
1
1 2 3 4 5 6 7 0
1 0 3 2 5 4 7 6
0
1
0
2 3 4 5 6 7 0 1
2 3 0 1 6 7 4 5
0
1
1
3 4 5 6 7 0 1 2
3 2 1 0 7 6 5 4
1
0
0
4 5 6 7 0 1 2 3
4 5 6 7 0 1 2 3
1
0
1
5 6 7 0 1 2 3 4
5 4 7 6 1 0 3 2
1
1
0
6 7 0 1 2 3 4 5
6 7 4 5 2 3 0 1
8
1
1
1
7 0 1 2 3 4 5 6
7 6 5 4 3 2 1 0
Full Page*
n
n
n
Cn Cn+1 Cn+2……
-
* Page length is a function of I/O organization and column addressing
×16 (CA0 ~ CA8):
Full page = 512bits
1. Command Truth Table
CKE
Command
Symbol
n-1
n
/CS
/RAS
/CAS
/WE
BA0,
BA1
A10
A11,
A9~A10
Ignore Command
DESL
H
X
H
X
X
X
X
X
X
No Operation
NOP
H
X
L
H
H
H
X
X
X
Burst Stop
BSTH
H
X
L
H
H
L
X
X
X
Read
READ
H
X
L
H
L
H
V
L
V
Read with Auto Pre-charge
READA
H
X
L
H
L
H
V
H
V
Write
WRIT
H
X
L
H
L
L
V
L
V
Write with Auto Pre-charge
WRITA
H
X
L
L
H
H
V
H
V
Bank Activate
ACT
H
X
L
L
H
H
V
V
V
Pre-charge Select Bank
PRE
H
X
L
L
H
L
V
L
X
Pre-charge All Banks
PALL
H
X
L
L
H
L
X
H
X
Mode Register Set
MRS
H
X
L
L
L
L
L
L
V
H = High level, L = Low level, X = High or Low level (Don't care), V = Valid data input
11/17
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