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Diffstat (limited to 'testsuite/vests/vhdl-ams/ashenden/compliant/resolution/words.vhd')
-rw-r--r-- | testsuite/vests/vhdl-ams/ashenden/compliant/resolution/words.vhd | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/resolution/words.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/resolution/words.vhd new file mode 100644 index 000000000..d5ccffc72 --- /dev/null +++ b/testsuite/vests/vhdl-ams/ashenden/compliant/resolution/words.vhd @@ -0,0 +1,63 @@ + +-- 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 + +package words is + + type X01Z is ('X', '0', '1', 'Z'); + type uword is array (0 to 31) of X01Z; + + type uword_vector is array (natural range <>) of uword; + + function resolve_word ( contribution : uword_vector ) return uword; + + subtype word is resolve_word uword; + + -- not in book + type ubyte is array (0 to 7) of X01Z; + -- end not in book + +end package words; + +-------------------------------------------------- + +package body words is + + type table is array (X01Z, X01Z) of X01Z; + + constant resolution_table : table := + -- 'X' '0' '1' 'Z' + -- ------------------ + ( ( 'X', 'X', 'X', 'X' ), -- 'X' + ( 'X', '0', 'X', '0' ), -- '0' + ( 'X', 'X', '1', '1' ), -- '1' + ( 'X', '0', '1', 'Z' ) ); -- 'Z' + + function resolve_word ( contribution : uword_vector ) return uword is + variable result : uword := (others => 'Z'); + begin + for index in contribution'range loop + for element in uword'range loop + result(element) := + resolution_table( result(element), contribution(index)(element) ); + end loop; + end loop; + return result; + end function resolve_word; + +end package body words; |