51 lines
1.8 KiB
VHDL
51 lines
1.8 KiB
VHDL
-- Copyright (c) 2015-2016 CERN
|
|
-- Maciej Suminski <maciej.suminski@cern.ch>
|
|
--
|
|
-- This source code is free software; you can redistribute it
|
|
-- and/or modify it in source code form 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.
|
|
--
|
|
-- This program 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 this program; if not, write to the Free Software
|
|
-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
|
|
|
|
|
-- Test for shift operators (logical and arithmetic)
|
|
|
|
library ieee;
|
|
use ieee.std_logic_1164.all;
|
|
use ieee.numeric_bit.all;
|
|
|
|
entity shifter is
|
|
port(input : in signed(7 downto 0);
|
|
out_srl, out_sll, out_sra, out_sla : out signed(7 downto 0);
|
|
out_shl_u, out_shr_u : out unsigned(7 downto 0);
|
|
out_shl_s, out_shr_s : out signed(7 downto 0)
|
|
);
|
|
end entity shifter;
|
|
|
|
architecture test of shifter is
|
|
begin
|
|
process(input)
|
|
-- test the unsigned variant of shift_left/right() functions
|
|
variable unsigned_input : unsigned(7 downto 0);
|
|
begin
|
|
unsigned_input := input;
|
|
out_srl <= input srl 1;
|
|
out_sll <= input sll 1;
|
|
out_sra <= input sra 1;
|
|
out_sla <= input sla 1;
|
|
out_shl_s <= shift_left(input, 2);
|
|
out_shr_s <= shift_right(input, 2);
|
|
out_shl_u <= shift_left(unsigned_input, 2);
|
|
out_shr_u <= shift_right(unsigned_input, 2);
|
|
end process;
|
|
end architecture test;
|