ics9248-131 Integrated Device Technology, ics9248-131 Datasheet - Page 4

• Manufacturer Part Number: ics9248-131
• Description: Frequency Generator & Integrated Buffers For Celeron & Pii/iii
• Manufacturer: Integrated Device Technology

ICS9248-131
Serial Configuration Command Bitmap
Bit 7,2
Bit 6:4
Bit 3
Bit 1
Bit 0
Bit
B
B
B
B
B
B
B
B
B
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
0 - Frequency is selected by hardware select, Latched inputs
1 - Frequency is selected by Bit 6:4 (above)
0 - Normal
1 - Spread Spectrum Enabled
0 - Running
1 - Tristate all outputs
Bit6 Bit5 Bit4
Bit7 Bit2
P
n i
0 4
3 4
4 4
1 4
111
110
101
100
011
010
001
000
0,0
0,1
1,0
1,1
-
-
-
-
#
P
W
Spread Spectrum Method
+/- 0.25% Center Spread Spectrum Modulation
+/- 0.15% Center Spread Spectrum Modulation
0 to -0.5 Down Spread Spectrum Modulation
+/- 0.375% Center Spread Spectrum Modulation
X
X
1
1
1
1
1
1
D
CPU Clock
95.25
96.22
66.67
83.3
91.5
100
97
60
R (
S
R (
F
F
C
C
C
Description
S
S
D
P
P
P
s e
s e
# 2
# 1
R
U
U
U
r e
r e
A
C
C
C
D
e v
e v
L
L
L
M
e
K
K
K
) d
) d
2 1
c s
2
1
0
i r
(
(
(
(
A
A
A
A
t p
33.33
31.75
33.30
32.33
30.50
32.07
33.33
30.00
/ t c
/ t c
/ t c
/ t c
PCI
o i
n I
n I
n I
n
n I
c a
c a
c a
c a
) t
) t
) t
) t
66.67
63.50
66.60
64.66
61.00
64.15
66.67
60.00
AGP
B
B
B
B
B
B
B
B
B
t i
t i
t i
t i
t i
t i
t i
t i
t i
7
6
4
2
0
5
3
1
Note1
PWD
001
0,0
P
0
0
0
n i
3 1
2 1
0 1
1 1
7
8
-
-
#
P
W
X
X
1
1
1
1
1
1
D
C
P
F
P
P
P
P
P
C
S
C
C
C
C
C
P
# 0
U
C I
C I
C I
C I
C I
C I
. 2
L
L
L
L
L
L
_ 5
K
K
K
K
K
K
_
4
3
2
1
( 0
. 3
D
F
(
(
(
(
A
# 3
A
A
A
A
e
(
c s
/ t c
A
/ t c
/ t c
/ t c
/ t c
i r
/ t c
n I
n I
n I
n I
n I
t p
n I
c a
c a
c a
c a
c a
o i
c a
) t
) t
) t
) t
) t
n
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