Clock J4

Dear,

I have a question regarding the "SMA connector J4" available on the
Nios Development board, Stratix Edition. Can we use it only for an
external clock? would it be possible to read any input signal from it,
I have an idea how to get the clock so this is not an issue.

Thanks in advance,
John.

Hi again,

After extensive reading and searching in documentation and board
schematic. I found the place of R15 and R13. It looks like these 2
resistors play the role of the controller of the multiplexer which
choose between the Y2 oscillator and the SMA connector. The question
is:

Does anyone know how to do the change asked in the note below? This
note is copied from the "Nios Development Board Reference Manual,
Stratix Edition"

Note to Figure 1-21:
(1) An external clock can be enabled by stuffing location R15 with a
49.9 ohm 0603 resistor and stuffing location R13 with a 330 ohm 0603
resistor.

Thanks in advance,
John


johngalil@hotmail.com wrote:
> Dear,
>
> I have a question regarding the "SMA connector J4" available on the
> Nios Development board, Stratix Edition. Can we use it only for an
> external clock? would it be possible to read any input signal from it,
> I have an idea how to get the clock so this is not an issue.
> 
> Thanks in advance,
> John.