User guide

43
Issued June 20, 2007
M5000 Series: User Guide
Quaternary PCI Segment
5.2 Quaternary PCI Segment
The Quaternary PCI Segment is a 64-bit/33MHz PCI bus.
Devices
Three major devices are located on the Quaternary PCI Segment:
• Tundra Universe IID PCI-to-VME bridge.
• Mercury PXB++ PCI-to-RACE++ bridge.
• PCI6540 PCI-X to PCI-X bridge.
Arbitration
The built in arbiter of the PCI6540 bridge is used to arbitrate this segment.
IDSEL Assignment
• AD[17] is used for the PCI6540 P2P Secondary Side IDSEL
• AD[18] is used for the Tundra Universe IID IDSEL
• AD[19] is used for the Mercury PXB++ IDSEL