It helped me today..Thank you for this simple explanation.

Thanks,
Satish

On Tuesday, June 16, 2015 at 11:48:40 AM UTC-7, Clemens Ladisch wrote:

wke...@gmail.com wrote:

I would appreciate of someone can explain the difference between
a PCI bridge and a PCI switch.

With good ol' PCI, a single bus can have many devices. A PCI bridge
is a device that connects multiple buses together, which is something
that was very seldom needed.

PCI Express looks, for software, very similar to PCI, but is electrically
a point-to-point connection, i.e., a PCIe bus has exactly two devices.

To connect PCIe with PCI, you need a PCI/PCIe or PCIe/PCI bridge.

If you have a single PCIe connector and multiple PCIe devices, you need
a PCIe switch. A single PCIe connection still is between exactly two
devices, so a PCIe switch consists of a (virtual) PCI bridge for the
upstream PCIe connection, and one (virtual) PCI bridge for each
downstream PCIe connection.

Regards,
Clemens

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