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Altera_Forum's avatar
Altera_Forum
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14 years ago

Arithmetic Operators in vhdl

Hi everyone,

Can arithmetic operators(such as '+','-',etc.) only be used within process

statement? If yes, why?Thanks.

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    No, operators can be used outside process. Then result will not be registered as it is when you use the operators within process.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    you can use them in functions and procedures too.

    basically, anything in the architecture is a process, just if its placed outside an explicit process it is an implicit process sensitive to all the signals on the RHS:

    a <= b * c;

    is the same as:

    process(b, c)

    begin

    a <= b * c;

    end process;