HDL Coder "Requested CP number exceeds total number of register-to-register CPs"

Hello,

I am running the HDL Workflow Advisor on a simple model which is attached to this request. The settings for the HDL Workflow Advisor are the same like proposed here (Synthesis tool: Xilinx ISE, Family: Kintex7).

Inspite of the simple model I am getting the error "Failed Requested CP number exceeds total number of register-to-register CPs generated during synthesis. Please check whether there is any register to register path in the model." during "4.3 Annotate Model with Synthesis Result" in "4. FPGA Synthesis and Analysis".

Could you please help me to find the reason for that failure?

Thanks in advance and best regards,

Tom

Answer 1

[Tim McBrayer]

CP stands for Critical Path. You have requested critical path analysis on your model, which will analyze the post-synthesis results and backannotate the timing information between registers onto the Simulink diagram. But, since you don't have any registers at all in your design, the critical path analysis can find no register-to-register paths. This is what the message is attempting to inform you of.

[Tom]

Hello Tim,

thanks for your answer - quite simple solution :) I am just starting to get to know HDL coder, but I am slowly advancing.

Thanks a lot and best regards, Tom

[Liclin]

but,what should I do to fix this question?

[Walter Roberson]

Either add registers to your design or turn off critical path analysis.