There is parallel bus for pci and serial bus for pcie. Why parallel bus cannot be used for pcie but are using serial bus? why there is shift to serial bus for pcie?
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Parallel bus is hard to be fast because of synchronizing signals per clock. Parallel signals must be sent synchronously. On the other hand, serial bus can send signals asynchronously, so is easy to be fast.
Akihito KIRISAKI
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so that why pcie is using serial bus and not parallel bus? – Pooja Balachandran Dec 15 '20 at 18:32
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To be able send signals asynchronously, it's unnecessary to synchronize other signals. Synchronizing is more difficult than people think. Than that, much faster clock frequency is better to send much data. – Akihito KIRISAKI Dec 15 '20 at 18:54