W254B Datasheet, PDF (5/16 Pages) SpectraLinear Inc – 133MHz Spread Spectrum FTG for Mobile Pentium® III Platforms

Table 5. 100 MHz Group Timing Relationships and Tolerances
Table 6.
Offset
Tolerance
CPU to
SDRAM
5.0 ns
500 ps
CPU to 3V66
5.0ns
500 ps
SDRAM to
3V66
0.0 ns
500 ps
3V66 to PCI
1.5-3.5 ns
500 ps
PCI to APIC
0.0 ns
1.0 ns
W254B
USB & DOT
Async
N/A
0 ns
CPU 133-MHz
SDRAM 100-MHz
3V66 66-MHz
PCI 33-MHz
APIC33-MHz
REF 14.318-MHz
USB 48-MHz
DOT 48-MHz
10 ns
Cycle Repeats
20 ns
30 ns
40 ns
Figure 4. Group Offset Waveforms (133-MHz CPU/100-MHz SDRAM Clock)
Table 7. 133 MHz/SDRAM 100 MHz Group Timing Relationships and Tolerances
Offset
Tolerance
CPU to
SDRAM
0.0 ns
500 ps
CPU to 3V66
0.0 ns
500 ps
SDRAM to 3V66
0.0 ns
500 ps
3V66 to PCI
1.5-3.5 ns
500 ps
PCI to APIC
0.0 ns
1.0 ns
USB & DOT
Async
N/A
Rev 1.0, November 20, 2006
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