diff options
Diffstat (limited to 'testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd')
-rw-r--r-- | testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd new file mode 100644 index 000000000..94fe98267 --- /dev/null +++ b/testsuite/vests/vhdl-ams/ashenden/compliant/subprograms/bv_to_natural.vhd @@ -0,0 +1,72 @@ + +-- 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 + +entity bv_to_natural is +end entity bv_to_natural; + + + +architecture test of bv_to_natural is + + -- code from book + + function bv_to_natural ( bv : in bit_vector ) return natural is + variable result : natural := 0; + begin + for index in bv'range loop + result := result * 2 + bit'pos(bv(index)); + end loop; + return result; + end function bv_to_natural; + + -- end code from book + + signal data : bit_vector(0 to 7); + constant address : bit_vector(0 to 3) := "0101"; + constant Taccess : delay_length := 80 ns; + +begin + + tester : process is + + constant rom_size : natural := 8; + constant word_size : natural := 8; + + -- code from book (in text) + + type rom_array is array (natural range 0 to rom_size-1) + of bit_vector(0 to word_size-1); + variable rom_data : rom_array; + + -- end code from book + + begin + + rom_data := (X"00", X"01", X"02", X"03", X"04", X"05", X"06", X"07"); + + -- code from book (in text) + + data <= rom_data ( bv_to_natural(address) ) after Taccess; + + -- end code from book + + wait; + end process tester; + +end architecture test; |