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Altera_Forum
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11 years ago

error 10559 VHDL

Hi, I was wondering if anyone can shed some light on this error that I managed to obtain. Error (10559): VHDL Subprogram Call error at user_functions.vhd(100): actual for formal parameter...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

The rising edge function requires the input to be a signal because it uses various attributes that only exist on a signal. The problem is that Z is a constant.

But I don't really understand this function. The variables will be re initialised every time the function is called, so it will only ever return 0 or 1. Why are you using a function and not a process?