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Intel i960 Series

Intel i960 Series
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A THEORY OF OPERATION
4-9
Figure 4-4. DRAM State Machine
Precharge
Precharge
Precharge/Idle
Assert RAS*
Assert RAS*
Assert CASEN*
If /(PF3 * /W_R)
assert INCBANK*
Assert RAS*
Assert CASEN*
Assert INCBANK*
Assert RAS*
If /W_R assert CASEN*
If /W_R * /(PF2 + PF3)
assert INCBANK*
Assert /REF
Assert /REF
Assert /REF. /RAS
Assert /REF. /RAS
Assert /REF. /RAS
/BLAST * PF3 * /W_R
/BLAST * PF0
/
B
L
A
S
T
*
P
F
3
*
W
_
R
/
B
L
A
S
T
*
P
F
2
/
B
L
A
S
T
*
P
F
1
/ADS * seldram *(PF1 + PF2 + PF3)
/W_R * (PF2 + PF3)
/
A
D
S
*
s
e
l
d
r
a
m
*
P
F
0
+
/
M
E
M
P
E
N
D
*
P
F
0
P
F
0
P
F
1
W
_
R
*
(
P
F
2
+
P
F
3
)
B
L
A
S
T
*
/
W
_
R
*
P
F
0
B
L
A
S
T
*
/
W
_
R
P
F
1
/
E
X
T
E
N
D
*
/
W
_
R
/REPEND
BLAST*/W_R*PF3
BLAST*/W_R*PF2
BLAST*W_R

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