W167B Datasheet, PDF (9/18 Pages) Cypress Semiconductor – 133-MHz Spread Spectrum FTG for Pentium II Platforms

PRELIMINARY
W167B
Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
SEL133/100#
SEL2
SEL1
SEL0
CPU
MHz
3V66
MHz
1
1
1
1
133.3
66.7
1
1
1
0
138
69
1
1
0
1
143
71.5
1
1
0
0
148
74
1
0
1
1
150
75
1
0
1
0
152.5
76.3
1
0
0
1
155
77.5
1
0
0
0
160
80
0
1
1
1
100.2
66.8
0
1
1
0
105
70
0
1
0
1
114
76
0
1
0
0
120
80
0
0
1
1
66.8
66.8
0
0
1
0
124
82.7
0
0
0
1
128.5
64.3
0
0
0
0
133.9
67
PCI
MHz
33.3
34.5
35.8
37
37.5
38.1
38.8
40
33.4
35
38
40
33.4
41.3
32.1
33.5
IOAPIC
MHz
16.7
17.3
17.9
18.5
18.8
19.1
19.4
20
16.7
17.5
19
20
16.7
20.7
16.1
16.7
Table 6. Select Function for Data Byte 0, Bits 0:1
Input Conditions
Data Byte 0
Function
Bit 1
Bit 0
CPU0:2,
Normal Operation
0
0
Note 2
Test Mode
0
1
TBD
Spread Spectrum
1
0
±0.25%
Three-state
1
1
Hi-Z
Note:
2. CPU, IOAPIC, and PCI frequency selections are listed in Table 1 and Table 5.
Output Conditions
PCI0:9
Note 2
TBD
±0.25%
Hi-Z
REF2X
14.318 MHz
TBD
14.318 MHz
Hi-Z
IOAPIC0:2
Note 2
TBD
±0.25%
Hi-Z
48/24MHZ
48/24 MHz
TBD
48/24 MHz
Hi-Z
9