JAJSQ97J may 2009 – january 2021 XIO2001
PRODUCTION DATA
When the PCI bus PME input transitions low, the bridge generates and sends a PCI Express PME message upstream. The requester ID portion of the PME message uses the stored value in the secondary bus number register as the bus number, 0 as the device number, and 0 as the function number. The Tag field for each PME message is 00h. A PME message is sent periodically until the PME signal transitions high.
Figure 8-5 illustrates the format for a PCI Express PME message.