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Two LAN9514, one crystal oscillator

Posted: Wed May 29, 2019 1:33 pm
by MrBool
I would like to use two LAN9514 with CM3. Is possible to clock them both with one crystal oscillator? For the first one I will use crystal oscillator, not signal from CM3.
I noticed that LAN9514 has 24MHz reference clock output but it is not useful for the second LAN9514 because it needs 25 MHz.

Re: Two LAN9514, one crystal oscillator

Posted: Wed May 29, 2019 1:49 pm
by fruitoftheloom
MrBool wrote:
Wed May 29, 2019 1:33 pm
I would like to use two LAN9514 with CM3. Is possible to clock them both with one crystal oscillator? For the first one I will use crystal oscillator, not signal from CM3.
I noticed that LAN9514 has 24MHz reference clock output but it is not useful for the second LAN9514 because it needs 25 MHz.

Recently another developer had a similar requirement:

viewtopic.php?f=98&t=239594

Re: Two LAN9514, one crystal oscillator

Posted: Wed May 29, 2019 4:27 pm
by hippy
MrBool wrote:
Wed May 29, 2019 1:33 pm
I would like to use two LAN9514 with CM3. Is possible to clock them both with one crystal oscillator?
It may be possible to take XO from the one with the crystal and feed that to the XI of the one without. That may require a buffer. Otherwise use an oscillator module and feed its output to both XI.