Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Integer problem....

Hello.

I made the code below and that is working well.

But when I test the code in Model_sim....

I don't know how to increase the input 1 by 1 like 0, 1, 2, 3, 4.... 15..

how can i make the inputs increase 1 by 1 in model_sim?

I want to know the way!!

LIBRARY IEEE;

USE IEEE.STD_LOGIC_1164.ALL;

ENTITY adder_integer is

PORT(

cin : in integer range 0 to 1;

astring : in integer range 0 to 15;

bstring : in integer range 0 to 15;

sum_string : out integer range 0 to 31);

end adder_integer;

architecture arc of adder_integer is

begin

sum_string<= astring + bstring + cin;

end arc;

2 Replies

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

    It depends of how you write your testbench.

    1. You can write a counter in your testbench in VHDL which feeds the input of "adder_integer"

    2. You can write a macro macro_adder_integer.do (simple text file) which looks like : 

    
#  increase "astring" from 0 to 15
for {set inc 0} {$inc <= 15} {incr inc} {
  #  generate stimuli
   force -freeze sim:/adder_integer/astring 0 10#$inc#
  #  simulate
   run 20 ns;#  arbitrary value since you don't have clock in your design (typically 50Mhz)
}

    And then in modelsim prompt, type do macro_adder_integer.do

    ModelSim Macros are in TCL langage

    3. type

    force -freeze sim:/adder_integer/astring 0 10#0#

    run 20 ns

    force -freeze sim:/adder_integer/astring 0 10#1#

    run 20 ns

    ...

    force -freeze sim:/adder_integer/astring 0 10#15#

    run 20 ns

    :-D