GXM Datasheet, PDF (177/244 Pages) National Semiconductor (TI) – Geode™ GXm Processor Integrated x86 Solution with MMX Support

Power Management (Continued)
6.5.3 Responding to a PCI Access During Suspend
Mode
The GXm processor can temporarily exit Suspend mode
to handle PCI accesses. If an unmasked REQx# is
asserted, the GXm processor will deassert SUSPA# and
exit the Suspend mode to respond to the PCI access. A
PCI access is completed when FRAME# is inactive and
TRDY# or STOP# are active. If SUSP# is asserted when
the PCI access is completed, the GXm processor will
assert SUSPA# and return to a SUSP#-initiated Suspend
mode. If it was a HALT-initiated Suspend mode and no
active interrupts have been recognized, the CPU will
assert SUSPA# and return to a HALT-initiated Suspend
mode.
SYSCLK
REQx#
FRAME#
TRDY#
SUSP#
SUSPA#
Figure 6-3. PCI Access During Suspend Mode
Revision 3.1
177
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