You have dout and count assigned in both processes. Neither are resolved signals. From IEEE Std 1076-1993: 12.6.1 Drivers Every signal assignment statement in a process statement defines a set of drivers for certain scalar signals. There is a single driver for a given scalar signal S in a process statement, provided that there is … Read more
Use the ieee.numeric_std library, and the appropriate vector type for the numbers you are working on (unsigned or signed). Then the operators are `sla`/`sra` for arithmetic shifts (ie fill with sign bit on right shifts and lsb on left shifts) and `sll`/`srl` for logical shifts (ie fill with ‘0’s). You pass a parameter to the … Read more
Variables get updated as you assign them. Signals get update in the next delta cycle (at the earliest). a := ‘1’; — variable assert a = 1; b <= ‘1’; — signal computationUsing(b); –reads old value of b — new value will be visible after this process ends or some time passes Jan Decaluwe explains … Read more
Your code seems very mixed up. There is a specific reason why it won’t synthesise: think carefully when the code immediately following this line here elsif (updownpassenger=”1″) then will be executed. It will be executed following a positive edge or negative edge on any input in the sensitivity list, apart from clk where it will … Read more
It looks to me like you’ve tried to instantiate lab_06 outside the architecture Behavior. Had you written end architecture Behavior;, I think the problem would have stared you in the face.