diff options
Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_05_ch_05_17.vhd')
-rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_05_ch_05_17.vhd | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_ch_05_17.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_ch_05_17.vhd new file mode 100644 index 000000000..ac43d358f --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_05_ch_05_17.vhd @@ -0,0 +1,76 @@ + +-- Copyright (C) 1996 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 + +-- --------------------------------------------------------------------- +-- +-- $Id: ch_05_ch_05_17.vhd,v 1.1.1.1 2001-08-22 18:20:47 paw Exp $ +-- $Revision: 1.1.1.1 $ +-- +-- --------------------------------------------------------------------- + +entity ch_05_17 is + +end entity ch_05_17; + + +---------------------------------------------------------------- + + +architecture test of ch_05_17 is + + signal s, r, q, q_n : bit := '0'; + +begin + + q <= '1' when s = '1' else + '0' when r = '1'; + + q_n <= '0' when s = '1' else + '1' when r = '1'; + + + -- code from book: + + check : process is + begin + assert not (s = '1' and r = '1') + report "Incorrect use of S_R_flip_flop: s and r both '1'"; + wait on s, r; + end process check; + + -- end of code from book + + + 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; |