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W196
PRELIMINARY
Document #: 38-07170 Rev. *A
Page 6 of 12
Note:
2.
CPU and PCI frequency selections are listed in Table 1 and Table 5.
Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
Input Conditions
Data Byte 3, Bit [7:4, 1:0]
Output Frequency
If Spread Is On
Bit [1:0]
Bit 7
SEL_3
Bit 6
SEL_2
Bit 5
SEL_1
Bit 4
SEL_0
CPU, SDRAM
Clocks (MHz)
PCI Clocks
(MHz)
Spread Percentage
00
0
0
0
0
78
39
OFF
00
0
0
0
1
81
40.5
OFF
00
0
0
1
0
113.5
37.8
OFF
00
0
0
1
1
66.8
33.4
OFF
00
0
1
0
0
117
39
OFF
00
0
1
0
1
118.5
39.5
OFF
00
0
1
1
0
122
37.3
OFF
00
0
1
1
1
100
33.3
OFF
00
1
0
0
0
126
31.5
OFF
00
1
0
0
1
135
33.75
OFF
00
1
0
1
0
137
34.25
OFF
00
1
0
1
1
138.5
34.62
OFF
00
1
1
0
0
142
35.5
OFF
00
1
1
0
1
144
36
OFF
00
1
1
1
0
155
38.75
OFF
00
1
1
1
1
133.3
33.3
OFF
10
0
0
0
0
124
41.3
±0.5% Center
10
0
0
0
1
75
37.5
±0.5% Center
10
0
0
1
0
83.3
41.65
±0.5% Center
10
0
0
1
1
66.8
33.4
±0.5% Center
10
0
1
0
0
90
30
±0.5% Center
10
0
1
0
1
112
37.3
±0.5% Center
10
0
1
1
0
95
31.67
±0.5% Center
10
0
1
1
1
100
33.3
±0.5% Center
10
1
0
0
0
120
40
±0.5% Center
10
1
0
0
1
115
38.3
±0.5% Center
10
1
0
1
0
110
36.67
±0.5% Center
10
1
0
1
1
105
35
±0.5% Center
10
1
1
0
0
140
35
±0.5% Center
10
1
1
0
1
150
37.5
±0.5% Center
10
1
1
1
0
124
31
±0.5% Center
10
1
1
1
1
133.3
33.3
±0.5% Center
Table 6. Select Function for Data Byte 3, Bits 0:1
Function
Input Conditions
Output Conditions
Data Byte 3
CPU0:1
PCI_F, PCI1:6
REF2X,
IOAPIC
48MHZ
24MHZ
Bit 1
Bit 0
Spread Spectrum OFF
0
0
Note 2
Note 2
14.318 MHz
48 MHz
24 MHz
Test Mode
0
1
X1/2
CPU/2, 3, or 4
X1
X1/2
X1/4
Spread Spectrum ON (default)
1
0
±0.5%
±0.5%
14.318 MHz
48 MHz
24 MHz
Three-state
1
1
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