Re: [microblaze-uclinux] Clock speed in system.mhs

[John Williams <jwilliams@itee.uq.edu.au>]

Hi Mike,

Mike Wirthlin wrote:
> I am in the process of building a mbvanilla for the Insight/Memec 
> Virtex2 board from scratch and noticed that the clock rate for this 
> system is 66 MHz. On my board, the clock  is 100 MHz (i.e. dedicated 
> clock signal on pin B11). Do I need to replace my 100 MHz clock and 
> obtain a 66 Mhz clock? Does this platform run at 100 MHz?

Curious timing - I was discussing this very issue with someone yesterday.

The mbvanilla platform contains a DCM that drops the 100MHz clock down 
to 66mhz.  I did this primarily to create some headroom for synthesis 
and timing etc.   With default Map and PAR options, I can't get this 
platform to meet timing at 100mhz.

So no, you don't need to change the clock.

I'm experimenting at the moment with getting it going at 100mhz, i'll 
report to the list if I have any success.

Regards,

John

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