As subject: all system are go and green on the Spartan-3A Starterkit board. No issues. Just working :)
Antti Lukats PS demo download also available now from our site.
As subject: all system are go and green on the Spartan-3A Starterkit board. No issues. Just working :)
Antti Lukats PS demo download also available now from our site.
Links are welcome
-- Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
here you go:
Ah, Antti, you are a genius! I was stuck with the way to receive the clk feedback from DDR to connect to the corresponding opb_mch_ddr pins. I completely overlooked the possibility of generating *2* clock pairs. I had even thought of shorting clock output to LOOP_IN or LOOP_OUT!
NTW, why do you use the combination of DCM outputs + inverters instead of directly using the 180/270 outputs? I thought the secodn solution should be better... but now I don' know
Best regards,
Zara
Hi Zara
actually this time its not me who genius. but generically I am too ;)
to your questions: the "two clock pairs" is used often in several other designs as well. and yes, until you see it done this way, you look for other more harder ways :(
the DCM scheme, well there are different possibilities, the one that is used is minimizing the BUFG usage, if you are not running low on BUFG you can use the other scheme with more BUFG useage as well.
Antti
Thanks!
Zara
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