Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

65

The root complex, also called the Root Fabric (RTF), implements the bus 0 interconnect 

of a PCI Express* Root Complex. The root complex contains the internal Root Complex 

Event Collector (RCEC). Only one PCI hierarchy is in the SoC.

SoC internal transactions flow through the root complex fabric simultaneously in the 

upstream and downstream directions at full bandwidth. Peer-to-Peer (P2P) transaction 

routing is also supported between the downstream root complex and I/O fabric ports. 

P2P memory read/writes are supported. P2P source and destination ports cannot be the 

same. P2P traffic consumes both upstream and downstream internal SoC bandwidth.

Peer-to-peer routing is only supported between the following:

• Integrated root port and another integrated root port.
• Integrated root port and an integrated endpoint device:

— GbE controller
— SATA2 controller
— SATA3 controller
— USB controller
— SMBus controller #1
— Platform Controller Unit (PCU)

Peer-to-peer routing is not supported between an integrated endpoint device and 

another integrated endpoint device.