Switching Waveforms (continued)
APIC-APIC Clock Skew
APIC
CY2280
APIC
t9
CPU_STOP
CPUCLK
(Internal)
PCICLK
(Internal)
PCICLK
(Free-Running)
CPU_STOP
CPUCLK
(External)
PCI_STOP
CPUCLK
(Internal)
PCICLK
(Internal)
PCICLK
(Free-Running)
PCI_STOP
PCICLK
(External)
PWR_DOWN
CPUCLK
(Internal)
PCICLK
(Internal)
PWR_DWN
CPUCLK
(External)
PCICLK
(External)
VCO
Crystal
Shaded section on the VCO and Crystal waveforms indicates that the VCO and crystal oscillator are active, and there is a valid clock.
Rev 1.0, November 25, 2006
Page 7 of 11