W144
| Model | W144 |
| Description | 440BX AGPset Spread Spectrum Frequency Synthesizer |
| PDF file | Total 14 pages (File size: 158K) |
| Chip Manufacturer | CYPRESS |
PRELIMINARY
Table 6. Additional Frequency Selections through Serial Data Interface Data Bytes
Input Conditions
Data Byte 0, Bit 3 = 1
Bit 2
SEL_3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Bit 6
SEL_2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
Bit 5
SEL_1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
Bit 4
SEL_0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
CPU, SDRAM Clocks
(MHz)
133.3
124
150
140
105
110
115
120
100
133
112
103
66.8
83.3
75
124
Output Frequency
W144
PCI Clocks
(MHz)
33.3 (CPU/4)
31 (CPU/4)
37.5 (CPU/4)
35 (CPU/4)
35 (CPU/3)
36.7 (CPU/3)
39.3 (CPU/3)
40 (CPU/3)
33.3 (CPU/3)
44.3 (CPU/3)
37.3 (CPU/3)
34.3 (CPU/3)
33.4 (CPU/2)
41.7 (CPU/2)
37.5 (CPU/2)
41.3 (CPU/3)
Table 7. Select Function for Data Byte 0, Bits 0:1
Input Conditions
Data Byte 0
Function
Normal Operation
Spread Spectrum
Three-state
Bit 1
0
1
1
Bit 0
0
0
1
CPU_F,
CPU1
Note 1
±0.5%
Hi-Z
PCI_F,
PCI1:5
Note 1
±0.5%
Hi-Z
Output Conditions
REF0:1,
IOAPIC
14.318 MHz
14.318 MHz
Hi-Z
48MHZ
48 MHz
48 MHz
Hi-Z
24MHZ
24 MHz
24 MHz
Hi-Z
Note:
2. CPU and PCI frequency selections are listed in
Table 2
and
Table 6.
8
