Re: [microblaze-uclinux] Clock Incongruity

[Tyrone Kwok <tokwok@xxxxxxxxx>]

I used that Nu-Horizons S3-400 board before. By setting the related jumper, you can

a 40 MHz (or higher) clock for your design.

 

Tyrone

 

On 9/14/05, Abot Botbot <dejanigma@hotmail.com> wrote:

Hello Folks,

  I have a question involving the final running clock frequency on the
Microblaze. I am using a pretty strange platform, a Nu-Horizons S3-400. It
has a 20 MHz crystal oscillator as its input clock. In EDK when I set up my
hardware in BSB, one of the first things it asks is the Reference Clock
Frequency. This pulldown has no option for a 20 Mhz clock input, in fact 40
MHz is as low as it goes. Is this a design lmiting factor? Could this mean
that the microblaze thinks its taking its 50 MHz clock input to get its 100
MHz core clock, that it really is getting a 40 MHz clock? I will include my
MSS and MHS files if they are of any concequence.

Thanks,
Andy

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