5/22/2023 0 Comments Hp pci express root complex![]() So I'm just a bit unsure regarding what the PCIe Root Complex is. ![]() ![]() The above makes it sound like the PCIe Root Complex is a 'thing' residing within the CPU. The chipset does however, include an 8-lane PCIe hub, in order to wire out x4 and x1 expansion slots as well as onboard controllers" It handles all the connectivity of the system, but lacks the main PCI-Express root complex which is instead embedded on the CPU. I then read online regarding the "The Lynx Point chipset is much like current platforms (P55, P67, Z68), a platform controller hub (PCH). This is agrees with what I thought, that both the CPU and PCH are part of the Root Complex as Bus 0 is in both the CPU and PCH. Bus 0 starts in the CPU and crosses the DMI into the PCH which also has Root Ports.Ī line in the 'PCI Express System Architecture' says "Bus 0 is an internal virtual bus within the Root Complex". On Bus 0 you then have logical PCI - PCI bridges that are the Root Ports, which PCIe devices are behind. It is my understanding from a software point of view that at Bus 0 Device 0 of the PCI config space you have the Root Bridge, that produces Bus 0. I've always presumed that the PCIe Root Complex was a combination of the CPU and the PCH as they both contain PCIe Root Ports, thereby connecting PCIe devices to CPU/memory. I have a question that's been bugging me regarding the PCIe Root Complex and the PCH and I'm hoping someone will be able to help clear things up a bit. First of all, sorry this is not in the appropriate forum but I was directed to post this here.
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