-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc -- This file is part of VESTs (Vhdl tESTs). -- VESTs is free software; you can redistribute it and/or modify it -- under the terms of the GNU General Public License as published by the -- Free Software Foundation; either version 2 of the License, or (at -- your option) any later version. -- VESTs is distributed in the hope that it will be useful, but WITHOUT -- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or -- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- for more details. -- You should have received a copy of the GNU General Public License -- along with VESTs; if not, write to the Free Software Foundation, -- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA architecture functional of S_R_flipflop is begin q <= '1' when s = '1' else '0' when r = '1'; q_n <= '0' when s = '1' else '1' when r = '1'; end architecture functional; entity tb_S_R_flipflop is end entity tb_S_R_flipflop; architecture test of tb_S_R_flipflop is signal s, r : bit := '0'; signal q, q_n : bit; begin dut : entity work.S_R_flipflop(functional) port map ( s => s, r => r, q => q, q_n => q_n ); stimulus : process is begin wait for 10 ns; s <= '1'; wait for 10 ns; s <= '0'; wait for 10 ns; r <= '1'; wait for 10 ns; r <= '0'; wait for 10 ns; s <= '1'; wait for 10 ns; r <= '1'; wait for 10 ns; s <= '0'; wait for 10 ns; r <= '0'; wait for 10 ns; wait; end process stimulus; end architecture test;