W164 Cypress Semiconductor Corp., W164 Datasheet - Page 6

• Manufacturer Part Number: W164
• Description: Spread Spectrum Desktop/notebook System Freqency Generator
• Manufacturer: Cypress Semiconductor Corp.

Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
Table 6. Select Function for Data Byte 3, Bits 0:1
Note:
2.
Normal Operation
Test Mode
Spread Spectrum
Three-state
SEL_3
CPU and PCI frequency selections are listed in Table 1 and Table 5.
Bit 7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Function
SEL_2
Data Byte 3, Bit 3 = 1
Bit 6
Input Conditions
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Input Conditions
Bit 1
0
1
0
1
Data Byte 3
SEL_1
Bit 5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 0
0
1
0
1
SEL_0
Bit 4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPU0:1
Note 2
±0.5%
X1/2
Hi-Z
CPU, SDRAM
Clocks (MHz)
6
PCI_F, PCI1:6
CPU/2, 3, or 4
133.3
68.5
83.3
66.8
103
112
100
117
117
124
129
138
143
148
153
75
Note 2
±0.5%
Output Frequency
Hi-Z
Output Conditions
14.318 MHz
14.318 MHz
PCI Clocks
REF2X,
IOAPIC
(MHz)
Hi-Z
34.25
34.25
29.25
32.25
35.75
38.25
37.5
41.6
33.4
37.3
33.3
33.3
39.0
31.0
34.5
37.0
X1
48 MHz
48 MHz
48MHZ
X1/2
Hi-Z
Spread Percentage
If Spread Is On
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
±0.5% Center
24 MHz
24 MHz
24MHZ
X1/4
Hi-Z
W164