Can someone explain the origin or history of the term 'derived clock'?

[Newton2this]

I am interested in knowing the origin or history of the term 'derived clock' as it applies to FPGA programming.  See the link below.

https://decibel.ni.com/content/docs/DOC-3003

Thank you.

[crossrulz]

A derived clock is nothing more than a clock you created (derived) from a real hardware clock.  This is done by multiplying and/or dividing the base clock.

This is needed for some applications to make some segments work faster/slower than what the base clock will allow, usually with signal processing.