HDL Coder no clock signals detected

Hello,

I was wondering how to set clock signals for MATLAB code. I noticed that the demo (corner detection found in HDL coder demos image processing) had a clock signal: clk | BUFGP | 1701

as well as an asynchronous control signal:

reset | IBUF | 861

Hence, I was wondering how to set these in my own design. I am not using simulink and want to find out how to set clock in MATLAB code.

Thank you, Alvin

Answer 1

[Tim McBrayer]

MATLAB code is untimed, sequential code. HDL Coder synthesizes this code to a cycle-accurate HDL implementation. The clock and reset signals are not present in the original MATLAB code in any form. They are synthetic signals, added to the user design.

[Alvin Mao]

In this case could you explain for the demos how during synthesis a clock was detected?

[Tim McBrayer]

Any state data, such as persistent MATLAB variables or a delay object instance, indicates state. When there is state in the design, HDL Coder infers a clock and reset signal.