I am not aware of any specs in datasheet or TRM, maybe someone on forum
knows. You might file a CASE, and ask for specs/characterization data -
To create a technical case at Cypress -
“Create a Case”
You have to be registered on Cypress web site first.
If you have a high speed DSO you can certainly measure jitter with that,
keep in mind it will be displayed as DSO jitter included, so look at its specs.
Also raise thedirect route to a GPIO issue. Looking at TRM and ap notes I do not
see a way to do this directly to a GPIO, the clock tree hands off everything
to a mux into DSI. However ap notes sometimes can be incomplete, so raise
Some useful ap notes -
http://www.cypress.com/?docID=41149 AN54439 Clocking on PSOC
http://www.cypress.com/?rID=39677 AN57821 Board layout info
I would not recommend you use the Mhz ECO output pin to xtal for a clock source, as
that adds additional Cload and the tolerance of Cload would challenge specs.
Lastly if you google "high speed clock layout practices" there is a wealth of
info on NET that would cover PCB routing and noise pickup issues.