Spartan-3A StarterKit, DDR2, WebServer EVERYTHING WORKS, tested ;)

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.

Reply to
Antti
Loading thread data ...

Links are welcome

--
Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
 Click to see the full signature
Reply to
Uwe Bonnes

here you go:

formatting link
Antti

Reply to
Antti

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

Reply to
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

Reply to
Antti

Thanks!

Zara

Reply to
Zara

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.