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Altera_Forum's avatar
Altera_Forum
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10 years ago

Carry_sum

Hi, i'm trying to improve the resolution of my TDC. I am usgin carry_sum (primitive) and i have placed the register near the combcell. Do you know if there is the way to use cin instead DATAD. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

wow. do you understand the architecture of logic element? if no please read about it.

The 'CIN' cannot fed up with signal you provide. it is stored in configuration. Am I wrong?

So in you code the very first 'cin' is used in the 2nd LE and in the very last LE you have no 'cout'.

i can mistake but it seems you can use '1' or '0' on 'cin' in the very first LE in your chain. but you should provide code that syntethis tool can aware for such situation.