How to use carry_sum to implement a carry chain?

[Altera_Forum]

I want to use the primitive carry_sum to implement a carry chain. And use the carry chain the implement a TDC. Can someone tell me how to use carry_sum to implement a carry chain?

[Altera_Forum]

Did you read the respective chapters in the stratix cookbook? There have been previous discussions related to TDC at Altera Forum B.T.W.

[Altera_Forum]

--- Quote Start ---  Did you read the respective chapters in the stratix cookbook? There have been previous discussions related to TDC at Altera Forum B.T.W.  --- Quote End ---     Thank you for your reply. I have read previous discussions related to TDC . But none of them have implement a carry chain. The cookbook has given some examples using WYSWYG LCELL primitives . But I want to implement the carry chain in CycloneII . Can you give me some suggestions?

[Altera_Forum]

--- Quote Start ---  Thank you for your reply. I have read previous discussions related to TDC . But none of them have implement a carry chain. The cookbook has given some examples using WYSWYG LCELL primitives . But I want to implement the carry chain in CycloneII . Can you give me some suggestions?  --- Quote End ---     Dear,  i am in your situation now :) Could you help me? i don't manage to reach a good resolution in time. How did you implement it?  Thank you  Alessia