Clock Muxing

Now a days we are handling multiple clock domains in our design . So we are always encounter with the problem that the switching between two clocks with out glitches.

There are two different chances,one two clock domains are totaly asynchronous or another one is one clock is multiple of another clock . In these two cases there is a chance for producing glitch while the switching between two clocks.

Usally we will disable both clock before swithing after that we change select pin & then enable clock for clock muxing.It is the safer methord of clockmuxing .

Here figures shows differents clocks muxing techniques .This is from an article in EE times. For more details click here