diff options
Diffstat (limited to 'testsuite/vests/vhdl-93/ashenden/compliant/ch_17_fg_17_11.vhd')
| -rw-r--r-- | testsuite/vests/vhdl-93/ashenden/compliant/ch_17_fg_17_11.vhd | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-93/ashenden/compliant/ch_17_fg_17_11.vhd b/testsuite/vests/vhdl-93/ashenden/compliant/ch_17_fg_17_11.vhd new file mode 100644 index 000000000..cac8c5ec2 --- /dev/null +++ b/testsuite/vests/vhdl-93/ashenden/compliant/ch_17_fg_17_11.vhd @@ -0,0 +1,164 @@ + +-- 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_17_fg_17_11.vhd,v 1.2 2001-10-26 16:29:36 paw Exp $ +-- $Revision: 1.2 $ +-- +-- --------------------------------------------------------------------- + +package body bounded_buffer_adt is + + function new_bounded_buffer ( size : in positive ) return bounded_buffer is + begin + return new bounded_buffer_object'( + byte_count => 0, head_index => 0, tail_index => 0, + store => new store_array(0 to size - 1) ); + end function new_bounded_buffer; + + procedure test_empty ( variable the_bounded_buffer : in bounded_buffer; + is_empty : out boolean ) is + begin + is_empty := the_bounded_buffer.byte_count = 0; + end procedure test_empty; + + procedure test_full ( variable the_bounded_buffer : in bounded_buffer; + is_full : out boolean ) is + begin + is_full := the_bounded_buffer.byte_count = the_bounded_buffer.store'length; + end procedure test_full; + + procedure write ( the_bounded_buffer : inout bounded_buffer; data : in byte ) is + variable buffer_full : boolean; + begin + test_full(the_bounded_buffer, buffer_full); + if buffer_full then + report "write to full bounded buffer" severity failure; + else + the_bounded_buffer.store(the_bounded_buffer.tail_index) := data; + the_bounded_buffer.tail_index := (the_bounded_buffer.tail_index + 1) + mod the_bounded_buffer.store'length; + the_bounded_buffer.byte_count := the_bounded_buffer.byte_count + 1; + end if; + end procedure write; + + procedure read ( the_bounded_buffer : inout bounded_buffer; data : out byte ) is + variable buffer_empty : boolean; + begin + test_empty(the_bounded_buffer, buffer_empty); + if buffer_empty then + report "read from empty bounded buffer" severity failure; + else + data := the_bounded_buffer.store(the_bounded_buffer.head_index); + the_bounded_buffer.head_index := (the_bounded_buffer.head_index + 1) + mod the_bounded_buffer.store'length; + the_bounded_buffer.byte_count := the_bounded_buffer.byte_count - 1; + end if; + end procedure read; + +end package body bounded_buffer_adt; + + + +-- not in book + +entity fg_17_11 is +end entity fg_17_11; + + +architecture test of fg_17_11 is +begin + + process is + + use work.bounded_buffer_adt.all; + + variable buf : bounded_buffer := new_bounded_buffer(4); + variable empty, full : boolean; + variable d : byte; + + begin + test_empty(buf, empty); + assert empty; + test_full(buf, full); + assert not full; + + write(buf, X"01"); + write(buf, X"02"); + + test_empty(buf, empty); + assert not empty; + test_full(buf, full); + assert not full; + + write(buf, X"03"); + write(buf, X"04"); + + test_empty(buf, empty); + assert not empty; + test_full(buf, full); + assert full; + + write(buf, X"05"); + + read(buf, d); + read(buf, d); + + test_empty(buf, empty); + assert not empty; + test_full(buf, full); + assert not full; + + read(buf, d); + read(buf, d); + + test_empty(buf, empty); + assert empty; + test_full(buf, full); + assert not full; + + read(buf, d); + + write(buf, X"06"); + write(buf, X"07"); + write(buf, X"08"); + read(buf, d); + read(buf, d); + write(buf, X"09"); + read(buf, d); + write(buf, X"0A"); + read(buf, d); + write(buf, X"0B"); + read(buf, d); + write(buf, X"0C"); + read(buf, d); + write(buf, X"0D"); + read(buf, d); + write(buf, X"0E"); + read(buf, d); + write(buf, X"0F"); + read(buf, d); + + wait; + end process; + +end architecture test; + +-- end not in book |