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

Question

Tom 2015-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/203913-hdl-coder-requested-cp-number-exceeds-total-number-of-register-to-register-cps

评论： Walter Roberson 2015-8-13

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

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Answer 1

Tim McBrayer 2015-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/203913-hdl-coder-requested-cp-number-exceeds-total-number-of-register-to-register-cps#answer_175478

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.