W164
| Model | W164 |
| Description | Spread Spectrum Desktop/Notebook System Frequency Generator |
| PDF file | Total 11 pages (File size: 140K) |
| Chip Manufacturer | CYPRESS |
W164
Table 5. Additional Frequency Selections through Serial Data Interface Data Bytes
Input Conditions
Data Byte 3, Bit 3 = 1
Bit 7
SEL_3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Bit 6
SEL_2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Bit 5
SEL_1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 4
SEL_0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPU, SDRAM
Clocks (MHz)
68.5
75
83.3
66.8
103
112
133.3
100
117
117
124
129
138
143
148
153
PCI Clocks
(MHz)
34.25
37.5
41.6
33.4
34.25
37.3
33.3
33.3
39.0
29.25
31.0
32.25
34.5
35.75
37.0
38.25
Spread Percentage
±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
Output Frequency
If Spread Is On
Table 6. Select Function for Data Byte 3, Bits 0:1
Input Conditions
Data Byte 3
Function
Normal Operation
Test Mode
Spread Spectrum
Three-state
Bit 1
0
0
1
1
Bit 0
0
1
0
1
CPU0:1
Note 2
X1/2
±0.5%
Hi-Z
PCI_F, PCI1:6
Note 2
CPU/2, 3, or 4
±0.5%
Hi-Z
Output Conditions
REF2X,
IOAPIC
14.318 MHz
X1
14.318 MHz
Hi-Z
48MHZ
48 MHz
X1/2
48 MHz
Hi-Z
24MHZ
24 MHz
X1/4
24 MHz
Hi-Z
Note:
2. CPU and PCI frequency selections are listed in
Table 1
and
Table 5.
6
