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Altera_Forum
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9 years ago

How to utilize programmable delay chain?

Greetings, I'm using a Cyclone IV, and I have a bi-directional DDR data strobe line that I am using to clock in data (clock in when I'm performing a read. I am basically using this documen...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

I didn't change the .sdc. (Or I did, it failed, and I changed it back). For DQS strobe you do need the same edge capture, so what I tried wouldn't work anyway. The only changes I made then are the HDL attributes and location constraint, which got it to meet timing.

That app note may be using specific hardware for DQDQS and require a megafunction. I'm not sure. I was just trying to close timing using the regular stuff.