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PCIe real connection to devices

uditknit

I have basic question regarding PCIe devices connections, This is being said, PCIe has 256 Buses, each bus can have 32 devices and each device can have 8 functions.

Since this is said, PCie is point to point connection, my question is how I can connect 5 physical devices over one PCIe bus

Thanks

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  • 0 Arm Employee Badge in reply to uditknit

    The general case is the one you mentioned with a single Endpoint alone on its bus, as the whole point of PCIe was to move to point-to-point physical links.

    I can think of two specific cases with multiple Endpoints on a bus (there might be more):

    1. Integrated Endpoints inside the Root Complex, which are all connected to the internal bus
    2. Legacy PCI Endpoints behind a PCIe-to-PCI bridge, all on the same PCI bus

    If you consider not only Endpoints but Devices: the PCI-to-PCI virtual bridges inside a switch or in the Root Ports are also all connected to a single internal bus.

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  • 0 Arm Employee Badge in reply to uditknit

    The general case is the one you mentioned with a single Endpoint alone on its bus, as the whole point of PCIe was to move to point-to-point physical links.

    I can think of two specific cases with multiple Endpoints on a bus (there might be more):

    1. Integrated Endpoints inside the Root Complex, which are all connected to the internal bus
    2. Legacy PCI Endpoints behind a PCIe-to-PCI bridge, all on the same PCI bus

    If you consider not only Endpoints but Devices: the PCI-to-PCI virtual bridges inside a switch or in the Root Ports are also all connected to a single internal bus.

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