Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

PLL error budget

I have 2 boards with 2 FPGA's (each board with its own FPGA). I'm outputting a signal out of each board which should be sync together. each board has its own local oscillator, from which each FPGA pr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

If you have two boards with separate oscillators then only the clock frequencies will be approximately equal. There will be no phase/sync relationship between them.

If you need both boards to be 'sync together', you will need to pass the clock (or a signal derived from the clock) from one board to the other and either: use it directly; or: synchronise the logic on the second board to the signal you're sending across.

Cheers,

Alex