Question #36: PCI (peripheral component interface) is one of the most used interface in computer systems. PCI is used for network cards, GPU, and so many peripherals. PCI is a parallel interface and its next version is PCIe (PCI express) which is in fact serial. Why do you think we are moving back to serial interface from parallel?
Options:
A) Parallel buses have limited speed because of timing skew (time difference of different bus lines of signal reaching at the receiver).
B) Parallel buses are too much complexity.
C) We don’t need high bandwidth as provided by parallel buses.
D) None of these.
Solution:
If the skew becomes greater than the clock cycle time, then it becomes impossible to recreate the correct data at the receiver. Hence, the correct answer is option A.
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