CY28443-3
1.8 ms
CPU_STOP#
PD
CPUT(Free Running
CPUC(Free Running
CPUT(Stoppable)
CPUC(Stoppable)
DOT96T
DOT96C
Figure 8. CPU_STP#= Driven, CPU_PD = Driven, DOT_PD = Driven
1.8 ms
CPU_STOP#
PD
CPUT(Free Running)
CPUC(Free Running)
CPUT(Stoppable)
CPUC(Stoppable)
DOT96T
DOT96C
Figure 9. CPU_STP# = Tri-state, CPU_PD = Tri-state, DOT_PD = Tri-state
PCI_STP# Assertion
PCI_STP# Deassertion
The PCI_STP# signal is an active LOW input used for
synchronous stopping and starting the PCI outputs while the
rest of the clock generator continues to function. The set-up
time for capturing PCI_STP# going LOW is 10 ns (tSU). (See
Figure 10.) The PCIF clocks will not be affected by this pin if
their corresponding control bit in the SMBus register is set to
allow them to be free running.
The deassertion of the PCI_STP# signal will cause all PCI and
stoppable PCIF clocks to resume running in a synchronous
manner within two PCI clock periods after PCI_STP# transi-
tions to a high level.
Tsu
PCI_STP#
PCI_F
PCI
SRC 100MHz
Figure 10. PCI_STP# Assertion Waveform
Rev 1.0,November 20, 2006
Page 14 of 23
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