The root complex (PCIe) and host bridge (PCI) provide a stateful translation layer between the PCIe/PCI logic on one side, and the system specific logic on the other. The PCIe root complex is to the PCIe architecture as the PCI host bridge is to the PCI architecture. I know there not easy questions to answer but if someone has any information it would be greatly appreciated. Do these lanes then 'use up' some of the lanes from the CPU, for example if I have a 28 PCIe lane CPU, will 8 of those lanes connect to the 8 lanes in the PCH?Īgain, what about the devices internal to the PCH, do these use up any PCIe lanes? My next question is regarding the PCIe lanes originating from the PCH, my Z87 chipset has 8 PCIe lanes from the PCH. They are not behind any Root Ports and are on Bus 0 so would they be part of the Root Complex. If so, what about the devices internal to the PCH (USB Cont., SATA Cont. The Root Complex contains Root Ports to connect to the PCIe devices.įirstly, the PCH (southbridge) contains Root Ports and devices that are on bus 0, so is the PCH part of the Root Complex? The 'inner' bus of the root complex is bus 0. I understand that the PCIe Root Complex is the Host Bridge in the CPU that connects the CPU and memory to the PCIe architecture. I have some questions regrading the PCIe Root Complex, PCIe lanes and the PCH and I am hoping someone here will be able to help as I can't find a clear answer online.
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