W149
| Model | W149 |
| Description | 440BX AGPset Spread Spectrum Frequency Synthesizer |
| PDF file | Total 14 pages (File size: 160K) |
| Chip Manufacturer | CYPRESS |
W149
Table 6. Additional Frequency Selections through Serial Data Interface Data Bytes
[3]
Input Conditions
Data Byte 0, Bit 3 = 1
Bit 6
SEL_2
1
1
1
1
0
0
0
0
Bit 5
SEL_1
1
1
0
0
1
1
0
0
Bit 4
SEL_0
1
0
1
0
1
0
1
0
CPU0:1,
SDRAM0:12 (MHz)
100. 2
(Reserved)
100
103
66.8
83.3
66.8
124
PCI_F, 1:5
(MHz)
33.4
(Reserved)
33.3
34.3
33.4
41.65
33.4
41.3
–0.5
(Reserved)
±0.5
–0.5
–0.5
–0.5
±0.5
–0.5
Output Frequency
Spread %
Table 7. Select Function for Data Byte 0, Bits 0:1
Input Conditions
Data Byte 0
Function
Normal Operation
Three-state
Bit 1
X
1
Bit 0
0
1
CPU0:1
Note 1
Hi-Z
PCI_F,
PCI1:5
Note 1
Hi-Z
Output Conditions
REF0:1,
IOAPIC
14.318 MHz
Hi-Z
48MHZ
48 MHz
Hi-Z
24MHZ
24 MHz
Hi-Z
Note:
3. CPU and PCI frequency selections are listed in
Table 2
and
Table 6.
8
