Common Clock Vs Source Synchronous Clock Scheme

Clocking schemes for triggering data signals fall in two broad categories – common clock scheme and the synchronous clock scheme. In common clock scheme, the clock is generated from a single source and goes to the transmitter IC as well as the receiver IC. The clock source is usually a clock multiplier, but it can be part of a processor or it can be a single clock oscillator with two traces going out from it. The figure below shows the common clock scheme. This type of clock is used in, for example, PCI Bus.
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