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SeqFunctions can be used for implementing frequently used algorithms in your code that also uses e.g. While or Wait.

The content inside the function is inserted at the position of NewFunction and names of the parameters are replaced with the connected signals.

Instead of a return value you can assign the value to a parameter and read the value of the connected signal inside the Process. Variables that are declared in the function are added to the process variables and can also be used in the Process too.

Advanced usage#

If you add FunctionContent in the function, the sections outside of FunctionContent will be added outside of the Process where you add NewFunction.


SeqFunction printChar(    char : STD_LOGIC_VECTOR(7 downto 0);    ena  : STD_LOGIC;    busy : STD_LOGIC;    data : STD_LOGIC_VECTOR(7 downto 0);){    While(busy = '1') {}    data <= char;    ena <= '1';    While(busy = '0') {}    ena <= '0';    While(busy = '1') {}}NewFunction printChar (x”56”, UART_Enable, UART_Busy, UART_Data);