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wait for
If you are just looking for the usage of wait look at the text below the dashed line. If you are wondering why ur wait statement is not getting synthesised, some synthesis tools do not support synthesis of wait statement. Other alternative that can be suggested is use of 'after', but some... -
process call happening more than once
As you know, the process loop that you have written gets triggered when any one of the 4 parameters in the sensitivity list change at any point of time. The assignment statement 'cout <= ain (op) bin' doesnot affect ur process sensitivity list parameters and more over 'cout' being equal to...
