Verilog Help (quote mark)

jihadmoussa · Mar 14, 2011

can somebody please explain the following assign for me:
bit_counter <= `COMMAND_BITS;

I couldn't know what does the quote mark do?
thank

mrflibble · Mar 14, 2011

Code:

`define COMMAND_BITS 4

bit_counter <= `COMMAND_BITS;

Does the same as:

Code:

bit_counter <= 4;

But with regard to coding style, you will probably want to use the "parameter" or "localparam" verilog directive for that.

Code:

parameter COMMAND_BITS = 4;

bit_counter <= (COMMAND_BITS); // better style IMO

Hope that helps.

jihadmoussa · Mar 15, 2011

Thank you very much.
you were really helpful.

thanks again.