User guide

38
M5000 Series: User Guide
Issued June 20, 2007
PMC Subsystem
• AD[20] is used for the PCI6540 P2P Primary Side IDSEL (PCI6540 closer to the Extension
Subsystem)
Processor PMC Support
The Processor PMC standard adds several extensions to the PMC standard:
• Support for a second PCI device: Support for a second device requires an additional REQ/
GNT pair and an additional IDSEL signal. This is implemented by using an additional REQ/
GNT pair from the PCI bus arbiter and connecting the extra IDSEL signal to an unused AD line
• Support for System Processor in the PPMC site (Monarch): Support for having the system
processor in the PPMC site is partially supported. The MONARCH# signal is controlled by a
configuration switch, and allows the PPMC to detect that it should be the system processor.
When MONARCH# is active, interrupts are routed to the PPMC site input signals rather than
from the PPMC site (output signals).
Note – The Monarch PPMC is also responsible for PCI bus enumeration in the system if the P2P
Bridge on the primary bus is in Non-Transparent Mode or the embedded AMCC 440GX
processor is not permitted to boot.
Only the first PMC site (PMC#1) includes support for the MONARCH feature.