ics9248-135 Integrated Device Technology, ics9248-135 Datasheet - Page 5

• Manufacturer Part Number: ics9248-135
• Description: Frequency Generator & Integrated Buffers For Celeron
• Manufacturer: Integrated Device Technology

Byte 3: SDRAM, Active/Inactive Register
(1= enable, 0 = disable)
Byte 5: Peripheral , Active/Inactive Register
(1= enable, 0 = disable)
Notes:
1. Inactive means outputs are held LOW and are disabled
2. Latched Frequency Selects (FS#) will be inverted logic
Byte 1: CPU, Active/Inactive Register
(1= enable, 0 = disable)
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B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
from switching.
load of the input frequency select pin conditions.
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
T I
t i
t i
t i
t i
t i
t i
t i
t i
T I
T I
7
6
5
4
3
2
0
1
7
6
5
4
3
2
1
0
7
6
5
4
3
2
0
1
I P
I P
I P
8 4
2
2 3
9 2
8 2
3 4
5 4
6 4
1 3
N
-
-
-
-
-
-
N
-
-
-
-
N
-
-
-
-
-
#
#
#
P
P
W
P
1
1
1
1
1
1
1
1
W
W
1
1
1
1
1
1
1
1
D
1
1
1
1
1
1
1
1
D
D
R
R
F
F
F
F
R
R
S
(
(
S
S
S
S
R
R
R
C
C
C
R
e
e
E
E
8 4
4 2
S
S
S
S
R
R
R
R
E
e s
e s
# 3
# 2
# 1
# 0
e
e
e
P
P
P
e
F
F
D
D
D
D
e
e
e
e
e s
e s
e s
e s
L
U
U
U
1
0
M
M
v r
v r
e s
e s
e s
e s
R
R
R
R
4 2
C
C
C
v r
v r
v r
v r
(
(
H
H
d e
d e
A
A
A
A
v r
v r
v r
v r
D
A
A
D
L
L
L
4 _
d e
d e
d e
d e
z
z
M
M
M
M
E
D
d e
d e
d e
d e
/ t c
/ t c
K
K
K
E
w
w
S
# 8
E
3
2
1
0
2
1
0
S
n I
n I
C
h
h
S
C
(
(
(
(
(
(
(
n e
n e
A
A
A
A
R
c a
c a
A
A
A
C
R
P I
R
/ t c
/ t c
/ t c
/ t c
/ t c
/ t c
/ t c
) t
) t
P I
s
s
P I
t e
t e
I T
n I
n I
n I
n I
n I
n I
n I
I T
I T
o t
o t
c a
c a
c a
c a
c a
c a
c a
O
O
N
O
) t
) t
) t
) t
) t
) t
) t
N
) 0
) 1
N
5
Byte 4: Reserved , Active/Inactive Register
(1= enable, 0 = disable)
Byte 2: PCI, Active/Inactive Register
(1= enable, 0 = disable)
Byte 6: Peripheral , Active/Inactive Register
(1= enable, 0 = disable)
Note: Don’t write into this register, writing into this register
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
i B
i B
i B
i B
i B
i B
B
B
i B
i B
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
T I
t i
T I
T I
7 t
6 t
5 t
4 t
3 t
2 t
1 t
0 t
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
can cause malfunction
I P
I P
I P
0 4
5 2
6 2
1 4
8 3
7 3
5 3
4 3
N
4 1
3 1
2 1
1 1
9
8
7
N
-
N
-
-
-
-
-
-
-
-
#
#
#
P
P
P
W
1
1
1
1
1
1
1
1
W
W
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
D
D
D
S
S
S
S
S
S
2
8 4
C (
P
P
P
P
P
P
P
R
R
R
R
R
R
R
R
_ 4
D
D
D
D
D
D
C
C
C
C
C
C
C
M
e
e
e
e
e
e
e
e
R
R
R
R
R
R
P
8 4
e s
e s
e s
e s
e s
e s
e s
e s
C I
C I
C I
C I
C I
C I
C I
H
A
A
A
A
A
A
U
v r
v r
v r
v r
v r
v r
v r
v r
ICS9248-135
M
z
L
L
L
L
L
L
L
M
M
M
M
M
M
2
D
D
D
5 .
d e
d e
d e
d e
d e
d e
d e
d e
K
K
K
K
K
K
K
H
_
_
7
6
5
4
E
E
E
3 _
6
5
4
3
2
1
_
F
F
z
S
S
S
F
(
(
(
(
(
(
(
(
1
0
(
(
(
(
(
(
C
N
N
N
N
N
N
N
N
3 .
C
C
A
A
A
A
A
A
(
R
t o
t o
t o
t o
t o
t o
t o
t o
R
) #
A
R
/ t c
/ t c
/ t c
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/ t c
P I
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P I
P I
/ t c
n I
n I
n I
n I
n I
n I
I T
I T
I T
n I
c a
c a
c a
c a
c a
c a
O
c a
O
O
) t
) t
) t
) t
) t
) t
N
N
N
) t