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tobiflex |
------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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-- --
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tobiflex |
-- Copyright (c) 2009-2019 Tobias Gubener --
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-- Patches by MikeJ, Till Harbaum, Rok Krajnk, ... --
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2 |
tobiflex |
-- Subdesign fAMpIGA by TobiFlex --
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-- --
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-- This source file is free software: you can redistribute it and/or modify --
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-- it under the terms of the GNU Lesser General Public License as published --
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-- by the Free Software Foundation, either version 3 of the License, or --
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-- (at your option) any later version. --
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-- --
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-- This source file is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --
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-- GNU General Public License for more details. --
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-- --
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-- You should have received a copy of the GNU General Public License --
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-- along with this program. If not, see <http://www.gnu.org/licenses/>. --
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-- --
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------------------------------------------------------------------------------
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------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_unsigned.all;
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use IEEE.numeric_std.all;
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use work.TG68K_Pack.all;
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entity TG68K_ALU is
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generic(
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4 |
tobiflex |
MUL_Mode : integer; --0=>16Bit, 1=>32Bit, 2=>switchable with CPU(1), 3=>no MUL,
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MUL_Hardware : integer; --0=>no, 1=>yes,
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DIV_Mode : integer; --0=>16Bit, 1=>32Bit, 2=>switchable with CPU(1), 3=>no DIV,
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BarrelShifter :integer --0=>no, 1=>yes, 2=>switchable with CPU(1)
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2 |
tobiflex |
);
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6 |
tobiflex |
port(clk : in std_logic;
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Reset : in std_logic;
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clkena_lw : in std_logic:='1';
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execOPC : in bit;
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decodeOPC : in bit;
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exe_condition : in std_logic;
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exec_tas : in std_logic;
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long_start : in bit;
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non_aligned : in std_logic;
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movem_presub : in bit;
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set_stop : in bit;
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Z_error : in bit;
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rot_bits : in std_logic_vector(1 downto 0);
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exec : in bit_vector(lastOpcBit downto 0);
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OP1out : in std_logic_vector(31 downto 0);
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OP2out : in std_logic_vector(31 downto 0);
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reg_QA : in std_logic_vector(31 downto 0);
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reg_QB : in std_logic_vector(31 downto 0);
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opcode : in std_logic_vector(15 downto 0);
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exe_opcode : in std_logic_vector(15 downto 0);
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exe_datatype : in std_logic_vector(1 downto 0);
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sndOPC : in std_logic_vector(15 downto 0);
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last_data_read : in std_logic_vector(15 downto 0);
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data_read : in std_logic_vector(15 downto 0);
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FlagsSR : in std_logic_vector(7 downto 0);
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micro_state : in micro_states;
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bf_ext_in : in std_logic_vector(7 downto 0);
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bf_ext_out : out std_logic_vector(7 downto 0);
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bf_shift : in std_logic_vector(5 downto 0);
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bf_width : in std_logic_vector(5 downto 0);
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bf_ffo_offset : in std_logic_vector(31 downto 0);
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bf_loffset : in std_logic_vector(4 downto 0);
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5 |
tobiflex |
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tobiflex |
set_V_Flag : buffer bit;
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Flags : buffer std_logic_vector(7 downto 0);
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c_out : buffer std_logic_vector(2 downto 0);
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addsub_q : buffer std_logic_vector(31 downto 0);
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ALUout : out std_logic_vector(31 downto 0)
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tobiflex |
);
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tobiflex |
end TG68K_ALU;
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architecture logic of TG68K_ALU is
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- ALU and more
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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tobiflex |
signal OP1in : std_logic_vector(31 downto 0);
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signal addsub_a : std_logic_vector(31 downto 0);
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signal addsub_b : std_logic_vector(31 downto 0);
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signal notaddsub_b : std_logic_vector(33 downto 0);
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signal add_result : std_logic_vector(33 downto 0);
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signal addsub_ofl : std_logic_vector(2 downto 0);
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signal opaddsub : bit;
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signal c_in : std_logic_vector(3 downto 0);
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signal flag_z : std_logic_vector(2 downto 0);
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signal set_Flags : std_logic_vector(3 downto 0); --NZVC
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signal CCRin : std_logic_vector(7 downto 0);
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2 |
tobiflex |
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--BCD
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tobiflex |
signal bcd_pur : std_logic_vector(9 downto 0);
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signal bcd_kor : std_logic_vector(8 downto 0);
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signal halve_carry : std_logic;
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signal Vflag_a : std_logic;
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signal bcd_a_carry : std_logic;
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signal bcd_a : std_logic_vector(8 downto 0);
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signal result_mulu : std_logic_vector(127 downto 0);
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signal result_div : std_logic_vector(63 downto 0);
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signal set_mV_Flag : std_logic;
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signal V_Flag : bit;
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signal rot_rot : std_logic;
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signal rot_lsb : std_logic;
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signal rot_msb : std_logic;
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signal rot_X : std_logic;
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signal rot_C : std_logic;
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signal rot_out : std_logic_vector(31 downto 0);
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signal asl_VFlag : std_logic;
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signal bit_bits : std_logic_vector(1 downto 0);
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signal bit_number : std_logic_vector(4 downto 0);
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signal bits_out : std_logic_vector(31 downto 0);
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signal one_bit_in : std_logic;
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signal bchg : std_logic;
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signal bset : std_logic;
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signal mulu_sign : std_logic;
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signal mulu_signext : std_logic_vector(16 downto 0);
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signal muls_msb : std_logic;
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signal mulu_reg : std_logic_vector(63 downto 0);
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signal FAsign : std_logic;
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signal faktorA : std_logic_vector(31 downto 0);
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signal faktorB : std_logic_vector(31 downto 0);
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signal div_reg : std_logic_vector(63 downto 0);
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signal div_quot : std_logic_vector(63 downto 0);
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signal div_ovl : std_logic;
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signal div_neg : std_logic;
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signal div_bit : std_logic;
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signal div_sub : std_logic_vector(32 downto 0);
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signal div_over : std_logic_vector(32 downto 0);
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signal nozero : std_logic;
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signal div_qsign : std_logic;
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signal divisor : std_logic_vector(63 downto 0);
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signal divs : std_logic;
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signal signedOP : std_logic;
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signal OP1_sign : std_logic;
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signal OP2_sign : std_logic;
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signal OP2outext : std_logic_vector(15 downto 0);
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2 |
tobiflex |
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6 |
tobiflex |
signal in_offset : std_logic_vector(5 downto 0);
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signal datareg : std_logic_vector(31 downto 0);
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signal insert : std_logic_vector(31 downto 0);
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signal bf_datareg : std_logic_vector(31 downto 0);
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signal result : std_logic_vector(39 downto 0);
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signal result_tmp : std_logic_vector(39 downto 0);
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signal unshifted_bitmask: std_logic_vector(31 downto 0);
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signal bf_set1 : std_logic_vector(39 downto 0);
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signal inmux0 : std_logic_vector(39 downto 0);
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signal inmux1 : std_logic_vector(39 downto 0);
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signal inmux2 : std_logic_vector(39 downto 0);
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signal inmux3 : std_logic_vector(31 downto 0);
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signal shifted_bitmask : std_logic_vector(39 downto 0);
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signal bitmaskmux0 : std_logic_vector(37 downto 0);
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signal bitmaskmux1 : std_logic_vector(35 downto 0);
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signal bitmaskmux2 : std_logic_vector(31 downto 0);
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signal bitmaskmux3 : std_logic_vector(31 downto 0);
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signal bf_set2 : std_logic_vector(31 downto 0);
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signal shift : std_logic_vector(39 downto 0);
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signal bf_firstbit : std_logic_vector(5 downto 0);
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signal mux : std_logic_vector(3 downto 0);
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signal bitnr : std_logic_vector(4 downto 0);
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signal mask : std_logic_vector(31 downto 0);
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signal mask_not_zero : std_logic;
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signal bf_bset : std_logic;
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signal bf_NFlag : std_logic;
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signal bf_bchg : std_logic;
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signal bf_ins : std_logic;
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signal bf_exts : std_logic;
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signal bf_fffo : std_logic;
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signal bf_d32 : std_logic;
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signal bf_s32 : std_logic;
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signal index : std_logic_vector(4 downto 0);
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-- signal i : integer range 0 to 31;
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-- signal i : integer range 0 to 31;
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-- signal i : std_logic_vector(5 downto 0);
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2 |
tobiflex |
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7 |
tobiflex |
signal hot_msb : std_logic_vector(33 downto 0);
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tobiflex |
signal vector : std_logic_vector(32 downto 0);
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signal result_bs : std_logic_vector(65 downto 0);
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signal bit_nr : std_logic_vector(5 downto 0);
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signal bit_msb : std_logic_vector(5 downto 0);
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signal bs_shift : std_logic_vector(5 downto 0);
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signal bs_shift_mod : std_logic_vector(5 downto 0);
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signal asl_over : std_logic_vector(32 downto 0);
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signal asl_over_xor : std_logic_vector(32 downto 0);
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signal asr_sign : std_logic_vector(32 downto 0);
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signal msb : std_logic;
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signal ring : std_logic_vector(5 downto 0);
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signal ALU : std_logic_vector(31 downto 0);
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signal BSout : std_logic_vector(31 downto 0);
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signal bs_V : std_logic;
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signal bs_C : std_logic;
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signal bs_X : std_logic;
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2 |
tobiflex |
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6 |
tobiflex |
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2 |
tobiflex |
BEGIN
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-----------------------------------------------------------------------------
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-- set OP1in
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-----------------------------------------------------------------------------
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PROCESS (OP2out, reg_QB, opcode, OP1out, OP1in, exe_datatype, addsub_q, execOPC, exec,
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6 |
tobiflex |
bcd_a, result_mulu, result_div, exe_condition, bf_shift, bf_ffo_offset, mulu_reg, BSout,
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Flags, FlagsSR, bits_out, exec_tas, rot_out, exe_opcode, result, bf_fffo, bf_firstbit, bf_datareg)
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2 |
tobiflex |
BEGIN
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ALUout <= OP1in;
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ALUout(7) <= OP1in(7) OR exec_tas;
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IF exec(opcBFwb)='1' THEN
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ALUout <= result(31 downto 0);
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IF bf_fffo='1' THEN
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ALUout <= bf_ffo_offset - bf_firstbit;
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END IF;
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END IF;
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OP1in <= addsub_q;
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IF exec(opcABCD)='1' OR exec(opcSBCD)='1' THEN
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OP1in(7 downto 0) <= bcd_a(7 downto 0);
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ELSIF exec(opcMULU)='1' AND MUL_Mode/=3 THEN
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IF MUL_Hardware=0 THEN
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IF exec(write_lowlong)='1' AND (MUL_Mode=1 OR MUL_Mode=2) THEN
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OP1in <= result_mulu(31 downto 0);
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ELSE
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OP1in <= result_mulu(63 downto 32);
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END IF;
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ELSE
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IF exec(write_lowlong)='1' THEN --AND (MUL_Mode=1 OR MUL_Mode=2) THEN
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OP1in <= result_mulu(31 downto 0);
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ELSE
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-- OP1in <= result_mulu(63 downto 32);
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OP1in <= mulu_reg(31 downto 0);
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END IF;
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END IF;
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ELSIF exec(opcDIVU)='1' AND DIV_Mode/=3 THEN
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IF exe_opcode(15)='1' OR DIV_Mode=0 THEN
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-- IF exe_opcode(15)='1' THEN
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OP1in <= result_div(47 downto 32)&result_div(15 downto 0);
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ELSE --64bit
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IF exec(write_reminder)='1' THEN
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OP1in <= result_div(63 downto 32);
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ELSE
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OP1in <= result_div(31 downto 0);
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END IF;
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END IF;
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ELSIF exec(opcOR)='1' THEN
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OP1in <= OP2out OR OP1out;
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ELSIF exec(opcAND)='1' THEN
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OP1in <= OP2out AND OP1out;
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ELSIF exec(opcScc)='1' THEN
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OP1in(7 downto 0) <= (others=>exe_condition);
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ELSIF exec(opcEOR)='1' THEN
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OP1in <= OP2out XOR OP1out;
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ELSIF exec(opcMOVE)='1' OR exec(exg)='1' THEN
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-- OP1in <= OP2out(31 downto 8)&(OP2out(7)OR exec_tas)&OP2out(6 downto 0);
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OP1in <= OP2out;
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ELSIF exec(opcROT)='1' THEN
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OP1in <= rot_out;
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ELSIF exec(exec_BS)='1' THEN
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OP1in <= BSout;
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ELSIF exec(opcSWAP)='1' THEN
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OP1in <= OP1out(15 downto 0)& OP1out(31 downto 16);
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ELSIF exec(opcBITS)='1' THEN
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OP1in <= bits_out;
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ELSIF exec(opcBF)='1' THEN
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OP1in <= bf_datareg; --new bitfieldvector for bfins - for others the old bitfieldvector
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ELSIF exec(opcMOVESR)='1' THEN
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OP1in(7 downto 0) <= Flags;
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IF exe_opcode(9)='1' THEN
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OP1in(15 downto 8) <= "00000000";
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ELSE
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OP1in(15 downto 8) <= FlagsSR;
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END IF;
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ELSIF exec(opcPACK)='1' THEN
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OP1in(7 downto 0) <= addsub_q(11 downto 8) & addsub_q(3 downto 0);
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END IF;
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END PROCESS;
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-----------------------------------------------------------------------------
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-- addsub
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| 283 |
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-----------------------------------------------------------------------------
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| 284 |
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PROCESS (OP1out, OP2out, execOPC, Flags, long_start, movem_presub, exe_datatype, exec, addsub_a, addsub_b, opaddsub,
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| 285 |
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notaddsub_b, add_result, c_in, sndOPC, non_aligned)
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| 286 |
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BEGIN
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| 287 |
|
|
addsub_a <= OP1out;
|
| 288 |
|
|
IF exec(get_bfoffset)='1' THEN
|
| 289 |
|
|
IF sndOPC(11)='1' THEN
|
| 290 |
|
|
addsub_a <= OP1out(31)&OP1out(31)&OP1out(31)&OP1out(31 downto 3);
|
| 291 |
|
|
ELSE
|
| 292 |
|
|
addsub_a <= "000000000000000000000000000000"&sndOPC(10 downto 9);
|
| 293 |
|
|
END IF;
|
| 294 |
|
|
END IF;
|
| 295 |
|
|
|
| 296 |
|
|
IF exec(subidx)='1' THEN
|
| 297 |
|
|
opaddsub <= '1';
|
| 298 |
|
|
ELSE
|
| 299 |
|
|
opaddsub <= '0';
|
| 300 |
|
|
END IF;
|
| 301 |
|
|
|
| 302 |
|
|
c_in(0) <='0';
|
| 303 |
|
|
addsub_b <= OP2out;
|
| 304 |
|
|
IF exec(opcUNPACK)='1' THEN
|
| 305 |
|
|
addsub_b(15 downto 0) <= "0000" & OP2out(7 downto 4) & "0000" & OP2out(3 downto 0);
|
| 306 |
|
|
ELSIF execOPC='0' AND exec(OP2out_one)='0' AND exec(get_bfoffset)='0'THEN
|
| 307 |
|
|
IF long_start='0' AND exe_datatype="00" AND exec(use_SP)='0' THEN
|
| 308 |
|
|
addsub_b <= "00000000000000000000000000000001";
|
| 309 |
|
|
ELSIF long_start='0' AND exe_datatype="10" AND (exec(presub) OR exec(postadd) OR movem_presub)='1' THEN
|
| 310 |
|
|
IF exec(movem_action)='1' THEN
|
| 311 |
|
|
addsub_b <= "00000000000000000000000000000110";
|
| 312 |
|
|
ELSE
|
| 313 |
|
|
addsub_b <= "00000000000000000000000000000100";
|
| 314 |
|
|
END IF;
|
| 315 |
|
|
ELSE
|
| 316 |
|
|
addsub_b <= "00000000000000000000000000000010";
|
| 317 |
|
|
END IF;
|
| 318 |
|
|
ELSE
|
| 319 |
|
|
IF (exec(use_XZFlag)='1' AND Flags(4)='1') OR exec(opcCHK)='1' THEN
|
| 320 |
|
|
c_in(0) <= '1';
|
| 321 |
|
|
END IF;
|
| 322 |
|
|
opaddsub <= exec(addsub);
|
| 323 |
|
|
END IF;
|
| 324 |
|
|
|
| 325 |
|
|
-- patch for un-aligned movem --mikej
|
| 326 |
|
|
if (exec(movem_action) = '1') then
|
| 327 |
|
|
if (movem_presub = '0') then -- up
|
| 328 |
|
|
if (non_aligned = '1') and (long_start = '0') then -- hold
|
| 329 |
|
|
addsub_b <= (others => '0');
|
| 330 |
|
|
end if;
|
| 331 |
|
|
else
|
| 332 |
|
|
if (non_aligned = '1') and (long_start = '0') then
|
| 333 |
|
|
if (exe_datatype = "10") then
|
| 334 |
|
|
addsub_b <= "00000000000000000000000000001000";
|
| 335 |
|
|
else
|
| 336 |
|
|
addsub_b <= "00000000000000000000000000000100";
|
| 337 |
|
|
end if;
|
| 338 |
|
|
end if;
|
| 339 |
|
|
end if;
|
| 340 |
|
|
end if;
|
| 341 |
|
|
|
| 342 |
|
|
IF opaddsub='0' OR long_start='1' THEN --ADD
|
| 343 |
|
|
notaddsub_b <= '0'&addsub_b&c_in(0);
|
| 344 |
|
|
ELSE --SUB
|
| 345 |
|
|
notaddsub_b <= NOT ('0'&addsub_b&c_in(0));
|
| 346 |
|
|
END IF;
|
| 347 |
|
|
add_result <= (('0'&addsub_a¬addsub_b(0))+notaddsub_b);
|
| 348 |
|
|
c_in(1) <= add_result(9) XOR addsub_a(8) XOR addsub_b(8);
|
| 349 |
|
|
c_in(2) <= add_result(17) XOR addsub_a(16) XOR addsub_b(16);
|
| 350 |
|
|
c_in(3) <= add_result(33);
|
| 351 |
|
|
addsub_q <= add_result(32 downto 1);
|
| 352 |
|
|
addsub_ofl(0) <= (c_in(1) XOR add_result(8) XOR addsub_a(7) XOR addsub_b(7)); --V Byte
|
| 353 |
|
|
addsub_ofl(1) <= (c_in(2) XOR add_result(16) XOR addsub_a(15) XOR addsub_b(15)); --V Word
|
| 354 |
|
|
addsub_ofl(2) <= (c_in(3) XOR add_result(32) XOR addsub_a(31) XOR addsub_b(31)); --V Long
|
| 355 |
|
|
c_out <= c_in(3 downto 1);
|
| 356 |
|
|
END PROCESS;
|
| 357 |
|
|
|
| 358 |
|
|
------------------------------------------------------------------------------
|
| 359 |
|
|
--ALU
|
| 360 |
|
|
------------------------------------------------------------------------------
|
| 361 |
|
|
PROCESS (OP1out, OP2out, exec, add_result, bcd_pur, bcd_a, bcd_kor, halve_carry, c_in)
|
| 362 |
|
|
BEGIN
|
| 363 |
|
|
--BCD_ARITH-------------------------------------------------------------------
|
| 364 |
|
|
--04.04.2017 by Tobiflex - BCD handling with all undefined behavior!
|
| 365 |
|
|
bcd_pur <= c_in(1)&add_result(8 downto 0);
|
| 366 |
|
|
bcd_kor <= "000000000";
|
| 367 |
|
|
halve_carry <= OP1out(4) XOR OP2out(4) XOR bcd_pur(5);
|
| 368 |
|
|
IF halve_carry='1' THEN
|
| 369 |
|
|
bcd_kor(3 downto 0) <= "0110"; -- -6
|
| 370 |
|
|
END IF;
|
| 371 |
|
|
IF bcd_pur(9)='1' THEN
|
| 372 |
|
|
bcd_kor(7 downto 4) <= "0110"; -- -60
|
| 373 |
|
|
END IF;
|
| 374 |
|
|
IF exec(opcABCD)='1' THEN
|
| 375 |
|
|
Vflag_a <= NOT bcd_pur(8) AND bcd_a(7);
|
| 376 |
|
|
-- bcd_pur <= ('0'&OP1out(7 downto 0)&'1') + ('0'&OP2out(7 downto 0)&Flags(4));
|
| 377 |
|
|
bcd_a <= bcd_pur(9 downto 1) + bcd_kor;
|
| 378 |
|
|
IF (bcd_pur(4) AND (bcd_pur(3) OR bcd_pur(2)))='1' THEN
|
| 379 |
|
|
bcd_kor(3 downto 0) <= "0110"; -- +6
|
| 380 |
|
|
END IF;
|
| 381 |
|
|
IF (bcd_pur(8) AND (bcd_pur(7) OR bcd_pur(6) OR (bcd_pur(5) AND bcd_pur(4) AND (bcd_pur(3) OR bcd_pur(2)))))='1' THEN
|
| 382 |
|
|
bcd_kor(7 downto 4) <= "0110"; -- +60
|
| 383 |
|
|
END IF;
|
| 384 |
|
|
ELSE --opcSBCD
|
| 385 |
|
|
Vflag_a <= bcd_pur(8) AND NOT bcd_a(7);
|
| 386 |
|
|
-- bcd_pur <= ('0'&OP1out(7 downto 0)&'0') - ('0'&OP2out(7 downto 0)&Flags(4));
|
| 387 |
|
|
bcd_a <= bcd_pur(9 downto 1) - bcd_kor;
|
| 388 |
|
|
END IF;
|
| 389 |
7 |
tobiflex |
Vflag_a <= '0'; --TG 01.11.2019 only for cputest -- but other behaiver in real 68000 Hardware ??? I must check this later
|
| 390 |
2 |
tobiflex |
bcd_a_carry <= bcd_pur(9) OR bcd_a(8);
|
| 391 |
|
|
END PROCESS;
|
| 392 |
|
|
|
| 393 |
|
|
-----------------------------------------------------------------------------
|
| 394 |
|
|
-- Bits
|
| 395 |
|
|
-----------------------------------------------------------------------------
|
| 396 |
|
|
PROCESS (clk, exe_opcode, OP1out, OP2out, reg_QB, one_bit_in, bchg, bset, bit_Number, sndOPC)
|
| 397 |
|
|
BEGIN
|
| 398 |
|
|
IF rising_edge(clk) THEN
|
| 399 |
|
|
IF clkena_lw = '1' THEN
|
| 400 |
|
|
bchg <= '0';
|
| 401 |
|
|
bset <= '0';
|
| 402 |
|
|
CASE opcode(7 downto 6) IS
|
| 403 |
|
|
WHEN "01" => --bchg
|
| 404 |
|
|
bchg <= '1';
|
| 405 |
|
|
WHEN "11" => --bset
|
| 406 |
|
|
bset <= '1';
|
| 407 |
|
|
WHEN OTHERS => NULL;
|
| 408 |
|
|
END CASE;
|
| 409 |
|
|
END IF;
|
| 410 |
|
|
END IF;
|
| 411 |
|
|
|
| 412 |
|
|
IF exe_opcode(8)='0' THEN
|
| 413 |
|
|
IF exe_opcode(5 downto 4)="00" THEN
|
| 414 |
|
|
bit_number <= sndOPC(4 downto 0);
|
| 415 |
|
|
ELSE
|
| 416 |
|
|
bit_number <= "00"&sndOPC(2 downto 0);
|
| 417 |
|
|
END IF;
|
| 418 |
|
|
ELSE
|
| 419 |
|
|
IF exe_opcode(5 downto 4)="00" THEN
|
| 420 |
|
|
bit_number <= reg_QB(4 downto 0);
|
| 421 |
|
|
ELSE
|
| 422 |
|
|
bit_number <= "00"®_QB(2 downto 0);
|
| 423 |
|
|
END IF;
|
| 424 |
|
|
END IF;
|
| 425 |
|
|
|
| 426 |
|
|
one_bit_in <= OP1out(conv_integer(bit_Number));
|
| 427 |
|
|
bits_out <= OP1out;
|
| 428 |
|
|
bits_out(conv_integer(bit_Number)) <= (bchg AND NOT one_bit_in) OR bset ;
|
| 429 |
|
|
END PROCESS;
|
| 430 |
|
|
|
| 431 |
|
|
-----------------------------------------------------------------------------
|
| 432 |
|
|
-- Bit Field
|
| 433 |
|
|
-----------------------------------------------------------------------------
|
| 434 |
|
|
|
| 435 |
|
|
PROCESS (clk, mux, mask, bitnr, bf_ins, bf_bchg, bf_bset, bf_exts, bf_shift, inmux0, inmux1, inmux2, inmux3, bf_set2, OP1out, OP2out,
|
| 436 |
|
|
result_tmp, bf_ext_in, mask_not_zero, exec, shift, datareg, bf_NFlag, result, reg_QB, unshifted_bitmask, bf_d32, bf_s32,
|
| 437 |
|
|
shifted_bitmask, bf_loffset, bitmaskmux0, bitmaskmux1, bitmaskmux2, bitmaskmux3, bf_width)
|
| 438 |
|
|
BEGIN
|
| 439 |
|
|
IF rising_edge(clk) THEN
|
| 440 |
4 |
tobiflex |
IF clkena_lw = '1' THEN
|
| 441 |
2 |
tobiflex |
bf_bset <= '0';
|
| 442 |
|
|
bf_bchg <= '0';
|
| 443 |
|
|
bf_ins <= '0';
|
| 444 |
|
|
bf_exts <= '0';
|
| 445 |
|
|
bf_fffo <= '0';
|
| 446 |
|
|
bf_d32 <= '0';
|
| 447 |
|
|
bf_s32 <= '0';
|
| 448 |
5 |
tobiflex |
-- 000-bftst, 001-bfextu, 010-bfchg, 011-bfexts, 100-bfclr, 101-bfff0, 110-bfset, 111-bfins
|
| 449 |
|
|
IF opcode(5 downto 4) ="00" THEN
|
| 450 |
|
|
bf_s32 <= '1';
|
| 451 |
|
|
END IF;
|
| 452 |
2 |
tobiflex |
CASE opcode(10 downto 8) IS
|
| 453 |
5 |
tobiflex |
WHEN "010" => bf_bchg <= '1'; --BFCHG
|
| 454 |
|
|
WHEN "011" => bf_exts <= '1'; --BFEXTS
|
| 455 |
|
|
-- WHEN "100" => insert <= (OTHERS =>'0'); --BFCLR
|
| 456 |
|
|
WHEN "101" => bf_fffo <= '1'; --BFFFO
|
| 457 |
|
|
WHEN "110" => bf_bset <= '1'; --BFSET
|
| 458 |
2 |
tobiflex |
WHEN "111" => bf_ins <= '1'; --BFINS
|
| 459 |
5 |
tobiflex |
bf_s32 <= '1';
|
| 460 |
2 |
tobiflex |
WHEN OTHERS => NULL;
|
| 461 |
|
|
END CASE;
|
| 462 |
|
|
IF opcode(4 downto 3)="00" THEN
|
| 463 |
|
|
bf_d32 <= '1';
|
| 464 |
|
|
END IF;
|
| 465 |
|
|
bf_ext_out <= result(39 downto 32);
|
| 466 |
|
|
END IF;
|
| 467 |
|
|
END IF;
|
| 468 |
|
|
|
| 469 |
|
|
IF bf_ins='1' THEN
|
| 470 |
|
|
datareg <= reg_QB;
|
| 471 |
|
|
ELSE
|
| 472 |
|
|
datareg <= bf_set2;
|
| 473 |
|
|
END IF;
|
| 474 |
|
|
|
| 475 |
|
|
|
| 476 |
|
|
-- create bitmask for operation
|
| 477 |
|
|
-- unshifted bitmask '0' => bit is in the Bitfieldvector
|
| 478 |
|
|
-- '1' => bit isn't in the Bitfieldvector
|
| 479 |
|
|
-- Example bf_with=11 => "11111111 11111111 11111000 00000000"
|
| 480 |
|
|
-- datareg
|
| 481 |
|
|
unshifted_bitmask <= (OTHERS => '0');
|
| 482 |
|
|
FOR i in 0 to 31 LOOP
|
| 483 |
|
|
IF i>bf_width(4 downto 0) THEN
|
| 484 |
|
|
datareg(i) <= '0';
|
| 485 |
|
|
unshifted_bitmask(i) <= '1';
|
| 486 |
|
|
END IF;
|
| 487 |
|
|
END LOOP;
|
| 488 |
|
|
|
| 489 |
|
|
bf_NFlag <= datareg(conv_integer(bf_width));
|
| 490 |
|
|
IF bf_exts='1' AND bf_NFlag='1' THEN
|
| 491 |
|
|
bf_datareg <= datareg OR unshifted_bitmask;
|
| 492 |
|
|
ELSE
|
| 493 |
|
|
bf_datareg <= datareg;
|
| 494 |
|
|
END IF;
|
| 495 |
|
|
|
| 496 |
|
|
-- shift bitmask for operation
|
| 497 |
|
|
IF bf_loffset(4)='1' THEN
|
| 498 |
|
|
bitmaskmux3 <= unshifted_bitmask(15 downto 0)&unshifted_bitmask(31 downto 16);
|
| 499 |
|
|
ELSE
|
| 500 |
|
|
bitmaskmux3 <= unshifted_bitmask;
|
| 501 |
|
|
END IF;
|
| 502 |
|
|
IF bf_loffset(3)='1' THEN
|
| 503 |
|
|
bitmaskmux2(31 downto 0) <= bitmaskmux3(23 downto 0)&bitmaskmux3(31 downto 24);
|
| 504 |
|
|
ELSE
|
| 505 |
|
|
bitmaskmux2(31 downto 0) <= bitmaskmux3;
|
| 506 |
|
|
END IF;
|
| 507 |
|
|
IF bf_loffset(2)='1' THEN
|
| 508 |
|
|
bitmaskmux1 <= bitmaskmux2&"1111";
|
| 509 |
|
|
IF bf_d32='1' THEN
|
| 510 |
|
|
bitmaskmux1(3 downto 0) <= bitmaskmux2(31 downto 28);
|
| 511 |
|
|
END IF;
|
| 512 |
|
|
ELSE
|
| 513 |
|
|
bitmaskmux1 <= "1111"&bitmaskmux2;
|
| 514 |
|
|
END IF;
|
| 515 |
|
|
IF bf_loffset(1)='1' THEN
|
| 516 |
|
|
bitmaskmux0 <= bitmaskmux1&"11";
|
| 517 |
|
|
IF bf_d32='1' THEN
|
| 518 |
|
|
bitmaskmux0(1 downto 0) <= bitmaskmux1(31 downto 30);
|
| 519 |
|
|
END IF;
|
| 520 |
|
|
ELSE
|
| 521 |
|
|
bitmaskmux0 <= "11"&bitmaskmux1;
|
| 522 |
|
|
END IF;
|
| 523 |
|
|
IF bf_loffset(0)='1' THEN
|
| 524 |
|
|
shifted_bitmask <= '1'&bitmaskmux0&'1';
|
| 525 |
|
|
IF bf_d32='1' THEN
|
| 526 |
|
|
shifted_bitmask(0) <= bitmaskmux0(31);
|
| 527 |
|
|
END IF;
|
| 528 |
|
|
ELSE
|
| 529 |
|
|
shifted_bitmask <= "11"&bitmaskmux0;
|
| 530 |
|
|
END IF;
|
| 531 |
|
|
|
| 532 |
|
|
|
| 533 |
|
|
-- shift for ins
|
| 534 |
|
|
shift <= bf_ext_in&OP2out;
|
| 535 |
|
|
IF bf_s32='1' THEN
|
| 536 |
|
|
shift(39 downto 32) <= OP2out(7 downto 0);
|
| 537 |
|
|
END IF;
|
| 538 |
|
|
|
| 539 |
|
|
IF bf_shift(0)='1' THEN
|
| 540 |
|
|
inmux0 <= shift(0)&shift(39 downto 1);
|
| 541 |
|
|
ELSE
|
| 542 |
|
|
inmux0 <= shift;
|
| 543 |
|
|
END IF;
|
| 544 |
|
|
IF bf_shift(1)='1' THEN
|
| 545 |
|
|
inmux1 <= inmux0(1 downto 0)&inmux0(39 downto 2);
|
| 546 |
|
|
ELSE
|
| 547 |
|
|
inmux1 <= inmux0;
|
| 548 |
|
|
END IF;
|
| 549 |
|
|
IF bf_shift(2)='1' THEN
|
| 550 |
|
|
inmux2 <= inmux1(3 downto 0)&inmux1(39 downto 4);
|
| 551 |
|
|
ELSE
|
| 552 |
|
|
inmux2 <= inmux1;
|
| 553 |
|
|
END IF;
|
| 554 |
|
|
IF bf_shift(3)='1' THEN
|
| 555 |
|
|
inmux3 <= inmux2(7 downto 0)&inmux2(31 downto 8);
|
| 556 |
|
|
ELSE
|
| 557 |
|
|
inmux3 <= inmux2(31 downto 0);
|
| 558 |
|
|
END IF;
|
| 559 |
|
|
IF bf_shift(4)='1' THEN
|
| 560 |
|
|
bf_set2(31 downto 0) <= inmux3(15 downto 0)&inmux3(31 downto 16);
|
| 561 |
|
|
ELSE
|
| 562 |
|
|
bf_set2(31 downto 0) <= inmux3;
|
| 563 |
|
|
END IF;
|
| 564 |
|
|
|
| 565 |
|
|
IF bf_ins='1' THEN
|
| 566 |
|
|
result(31 downto 0) <= bf_set2;
|
| 567 |
|
|
result(39 downto 32) <= bf_set2(7 downto 0);
|
| 568 |
|
|
ELSIF bf_bchg='1' THEN
|
| 569 |
|
|
result(31 downto 0) <= NOT OP2out;
|
| 570 |
|
|
result(39 downto 32) <= NOT bf_ext_in;
|
| 571 |
|
|
ELSE
|
| 572 |
|
|
result <= (OTHERS => '0');
|
| 573 |
|
|
END IF;
|
| 574 |
|
|
IF bf_bset='1' THEN
|
| 575 |
|
|
result <= (OTHERS => '1');
|
| 576 |
|
|
END IF;
|
| 577 |
|
|
--
|
| 578 |
|
|
IF bf_ins='1' THEN
|
| 579 |
|
|
result_tmp <= bf_ext_in&OP1out;
|
| 580 |
|
|
ELSE
|
| 581 |
|
|
result_tmp <= bf_ext_in&OP2out;
|
| 582 |
|
|
END IF;
|
| 583 |
|
|
FOR i in 0 to 39 LOOP
|
| 584 |
|
|
IF shifted_bitmask(i)='1' THEN
|
| 585 |
|
|
result(i) <= result_tmp(i); --restore old data
|
| 586 |
|
|
END IF;
|
| 587 |
|
|
END LOOP;
|
| 588 |
|
|
|
| 589 |
|
|
--BFFFO
|
| 590 |
|
|
mask <= datareg;
|
| 591 |
|
|
bf_firstbit <= ('0'&bitnr)+mask_not_zero;
|
| 592 |
|
|
bitnr <= "11111";
|
| 593 |
|
|
mask_not_zero <= '1';
|
| 594 |
|
|
IF mask(31 downto 28)="0000" THEN
|
| 595 |
|
|
IF mask(27 downto 24)="0000" THEN
|
| 596 |
|
|
IF mask(23 downto 20)="0000" THEN
|
| 597 |
|
|
IF mask(19 downto 16)="0000" THEN
|
| 598 |
|
|
bitnr(4) <= '0';
|
| 599 |
|
|
IF mask(15 downto 12)="0000" THEN
|
| 600 |
|
|
IF mask(11 downto 8)="0000" THEN
|
| 601 |
|
|
bitnr(3) <= '0';
|
| 602 |
|
|
IF mask(7 downto 4)="0000" THEN
|
| 603 |
|
|
bitnr(2) <= '0';
|
| 604 |
|
|
mux <= mask(3 downto 0);
|
| 605 |
|
|
ELSE
|
| 606 |
|
|
mux <= mask(7 downto 4);
|
| 607 |
|
|
END IF;
|
| 608 |
|
|
ELSE
|
| 609 |
|
|
mux <= mask(11 downto 8);
|
| 610 |
|
|
bitnr(2) <= '0';
|
| 611 |
|
|
END IF;
|
| 612 |
|
|
ELSE
|
| 613 |
|
|
mux <= mask(15 downto 12);
|
| 614 |
|
|
END IF;
|
| 615 |
|
|
ELSE
|
| 616 |
|
|
mux <= mask(19 downto 16);
|
| 617 |
|
|
bitnr(3) <= '0';
|
| 618 |
|
|
bitnr(2) <= '0';
|
| 619 |
|
|
END IF;
|
| 620 |
|
|
ELSE
|
| 621 |
|
|
mux <= mask(23 downto 20);
|
| 622 |
|
|
bitnr(3) <= '0';
|
| 623 |
|
|
END IF;
|
| 624 |
|
|
ELSE
|
| 625 |
|
|
mux <= mask(27 downto 24);
|
| 626 |
|
|
bitnr(2) <= '0';
|
| 627 |
|
|
END IF;
|
| 628 |
|
|
ELSE
|
| 629 |
|
|
mux <= mask(31 downto 28);
|
| 630 |
|
|
END IF;
|
| 631 |
|
|
|
| 632 |
|
|
IF mux(3 downto 2)="00" THEN
|
| 633 |
|
|
bitnr(1) <= '0';
|
| 634 |
|
|
IF mux(1)='0' THEN
|
| 635 |
|
|
bitnr(0) <= '0';
|
| 636 |
|
|
IF mux(0)='0' THEN
|
| 637 |
|
|
mask_not_zero <= '0';
|
| 638 |
|
|
END IF;
|
| 639 |
|
|
END IF;
|
| 640 |
|
|
ELSE
|
| 641 |
|
|
IF mux(3)='0' THEN
|
| 642 |
|
|
bitnr(0) <= '0';
|
| 643 |
|
|
END IF;
|
| 644 |
|
|
END IF;
|
| 645 |
|
|
END PROCESS;
|
| 646 |
|
|
|
| 647 |
|
|
-----------------------------------------------------------------------------
|
| 648 |
|
|
-- Rotation
|
| 649 |
|
|
-----------------------------------------------------------------------------
|
| 650 |
|
|
PROCESS (exe_opcode, OP1out, Flags, rot_bits, rot_msb, rot_lsb, rot_rot, exec, BSout)
|
| 651 |
|
|
BEGIN
|
| 652 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 653 |
|
|
WHEN "00" => --Byte
|
| 654 |
|
|
rot_rot <= OP1out(7);
|
| 655 |
|
|
WHEN "01"|"11" => --Word
|
| 656 |
|
|
rot_rot <= OP1out(15);
|
| 657 |
|
|
WHEN "10" => --Long
|
| 658 |
|
|
rot_rot <= OP1out(31);
|
| 659 |
|
|
WHEN OTHERS => NULL;
|
| 660 |
|
|
END CASE;
|
| 661 |
|
|
|
| 662 |
|
|
CASE rot_bits IS
|
| 663 |
|
|
WHEN "00" => --ASL, ASR
|
| 664 |
|
|
rot_lsb <= '0';
|
| 665 |
|
|
rot_msb <= rot_rot;
|
| 666 |
|
|
WHEN "01" => --LSL, LSR
|
| 667 |
|
|
rot_lsb <= '0';
|
| 668 |
|
|
rot_msb <= '0';
|
| 669 |
|
|
WHEN "10" => --ROXL, ROXR
|
| 670 |
|
|
rot_lsb <= Flags(4);
|
| 671 |
|
|
rot_msb <= Flags(4);
|
| 672 |
|
|
WHEN "11" => --ROL, ROR
|
| 673 |
|
|
rot_lsb <= rot_rot;
|
| 674 |
|
|
rot_msb <= OP1out(0);
|
| 675 |
|
|
WHEN OTHERS => NULL;
|
| 676 |
|
|
END CASE;
|
| 677 |
|
|
|
| 678 |
|
|
IF exec(rot_nop)='1' THEN
|
| 679 |
|
|
rot_out <= OP1out;
|
| 680 |
|
|
rot_X <= Flags(4);
|
| 681 |
|
|
IF rot_bits="10" THEN --ROXL, ROXR
|
| 682 |
|
|
rot_C <= Flags(4);
|
| 683 |
|
|
ELSE
|
| 684 |
|
|
rot_C <= '0';
|
| 685 |
|
|
END IF;
|
| 686 |
|
|
ELSE
|
| 687 |
|
|
IF exe_opcode(8)='1' THEN --left
|
| 688 |
|
|
rot_out <= OP1out(30 downto 0)&rot_lsb;
|
| 689 |
|
|
rot_X <= rot_rot;
|
| 690 |
|
|
rot_C <= rot_rot;
|
| 691 |
|
|
ELSE --right
|
| 692 |
|
|
rot_X <= OP1out(0);
|
| 693 |
|
|
rot_C <= OP1out(0);
|
| 694 |
|
|
rot_out <= rot_msb&OP1out(31 downto 1);
|
| 695 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 696 |
|
|
WHEN "00" => --Byte
|
| 697 |
|
|
rot_out(7) <= rot_msb;
|
| 698 |
|
|
WHEN "01"|"11" => --Word
|
| 699 |
|
|
rot_out(15) <= rot_msb;
|
| 700 |
|
|
WHEN OTHERS => NULL;
|
| 701 |
|
|
END CASE;
|
| 702 |
|
|
END IF;
|
| 703 |
|
|
IF BarrelShifter/=0 THEN
|
| 704 |
|
|
rot_out <= BSout;
|
| 705 |
|
|
END IF;
|
| 706 |
|
|
END IF;
|
| 707 |
|
|
END PROCESS;
|
| 708 |
|
|
|
| 709 |
|
|
-----------------------------------------------------------------------------
|
| 710 |
|
|
-- Barrel Shifter
|
| 711 |
|
|
-----------------------------------------------------------------------------
|
| 712 |
7 |
tobiflex |
process (OP1out, OP2out, opcode, bit_nr, bit_msb, bs_shift, bs_shift_mod, ring, result_bs, exe_opcode, vector,
|
| 713 |
|
|
rot_bits, Flags, bs_C, msb, hot_msb, asl_over, asl_over_xor, ALU, asr_sign, exec)
|
| 714 |
2 |
tobiflex |
begin
|
| 715 |
|
|
ring <= "100000";
|
| 716 |
|
|
IF rot_bits="10" THEN --ROX L/R
|
| 717 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 718 |
|
|
WHEN "00" => --Byte
|
| 719 |
|
|
ring <= "001001";
|
| 720 |
|
|
WHEN "01"|"11" => --Word
|
| 721 |
|
|
ring <= "010001";
|
| 722 |
|
|
WHEN "10" => --Long
|
| 723 |
|
|
ring <= "100001";
|
| 724 |
|
|
WHEN OTHERS => NULL;
|
| 725 |
|
|
END CASE;
|
| 726 |
|
|
ELSE
|
| 727 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 728 |
|
|
WHEN "00" => --Byte
|
| 729 |
|
|
ring <= "001000";
|
| 730 |
|
|
WHEN "01"|"11" => --Word
|
| 731 |
|
|
ring <= "010000";
|
| 732 |
|
|
WHEN "10" => --Long
|
| 733 |
|
|
ring <= "100000";
|
| 734 |
|
|
WHEN OTHERS => NULL;
|
| 735 |
|
|
END CASE;
|
| 736 |
|
|
END IF;
|
| 737 |
|
|
|
| 738 |
|
|
IF exe_opcode(7 downto 6)="11" OR exec(exec_BS)='0' THEN
|
| 739 |
|
|
bs_shift <="000001";
|
| 740 |
|
|
ELSIF exe_opcode(5)='1' THEN
|
| 741 |
|
|
bs_shift <= OP2out(5 downto 0);
|
| 742 |
|
|
ELSE
|
| 743 |
|
|
bs_shift(2 downto 0) <= exe_opcode(11 downto 9);
|
| 744 |
|
|
IF exe_opcode(11 downto 9)="000" THEN
|
| 745 |
|
|
bs_shift(5 downto 3) <="001";
|
| 746 |
|
|
ELSE
|
| 747 |
|
|
bs_shift(5 downto 3) <="000";
|
| 748 |
|
|
END IF;
|
| 749 |
|
|
END IF;
|
| 750 |
|
|
|
| 751 |
|
|
-- calc V-Flag by ASL
|
| 752 |
7 |
tobiflex |
bit_msb <= "000000";
|
| 753 |
2 |
tobiflex |
hot_msb <= (OTHERS =>'0');
|
| 754 |
|
|
hot_msb(conv_integer(bit_msb)) <= '1';
|
| 755 |
7 |
tobiflex |
IF bs_shift < ring THEN
|
| 756 |
2 |
tobiflex |
bit_msb <= ring-bs_shift;
|
| 757 |
6 |
tobiflex |
END IF;
|
| 758 |
|
|
asl_over_xor <= (('0'&vector(30 downto 0)) XOR ('0'&vector(31 downto 1)))&msb;
|
| 759 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 760 |
|
|
WHEN "00" => --Byte
|
| 761 |
|
|
asl_over_xor(8) <= '0';
|
| 762 |
|
|
WHEN "01"|"11" => --Word
|
| 763 |
|
|
asl_over_xor(16) <= '0';
|
| 764 |
|
|
WHEN OTHERS => NULL;
|
| 765 |
|
|
END CASE;
|
| 766 |
|
|
asl_over <= asl_over_xor - ('0'&hot_msb(31 downto 0));
|
| 767 |
2 |
tobiflex |
bs_V <= '0';
|
| 768 |
|
|
IF rot_bits="00" AND exe_opcode(8)='1' THEN --ASL
|
| 769 |
|
|
bs_V <= not asl_over(32);
|
| 770 |
|
|
END IF;
|
| 771 |
|
|
|
| 772 |
7 |
tobiflex |
bs_X <= bs_C;
|
| 773 |
2 |
tobiflex |
IF exe_opcode(8)='0' THEN --right shift
|
| 774 |
|
|
bs_C <= result_bs(31);
|
| 775 |
|
|
ELSE --left shift
|
| 776 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 777 |
|
|
WHEN "00" => --Byte
|
| 778 |
|
|
bs_C <= result_bs(8);
|
| 779 |
|
|
WHEN "01"|"11" => --Word
|
| 780 |
|
|
bs_C <= result_bs(16);
|
| 781 |
|
|
WHEN "10" => --Long
|
| 782 |
|
|
bs_C <= result_bs(32);
|
| 783 |
|
|
WHEN OTHERS => NULL;
|
| 784 |
|
|
END CASE;
|
| 785 |
|
|
END IF;
|
| 786 |
|
|
|
| 787 |
|
|
ALU <= (others=>'-');
|
| 788 |
|
|
IF rot_bits="11" THEN --RO L/R
|
| 789 |
|
|
bs_X <= Flags(4);
|
| 790 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 791 |
|
|
WHEN "00" => --Byte
|
| 792 |
|
|
ALU(7 downto 0) <= result_bs(7 downto 0) OR result_bs(15 downto 8);
|
| 793 |
6 |
tobiflex |
bs_C <= ALU(7);
|
| 794 |
2 |
tobiflex |
WHEN "01"|"11" => --Word
|
| 795 |
|
|
ALU(15 downto 0) <= result_bs(15 downto 0) OR result_bs(31 downto 16);
|
| 796 |
6 |
tobiflex |
bs_C <= ALU(15);
|
| 797 |
2 |
tobiflex |
WHEN "10" => --Long
|
| 798 |
|
|
ALU <= result_bs(31 downto 0) OR result_bs(63 downto 32);
|
| 799 |
6 |
tobiflex |
bs_C <= ALU(31);
|
| 800 |
2 |
tobiflex |
WHEN OTHERS => NULL;
|
| 801 |
|
|
END CASE;
|
| 802 |
6 |
tobiflex |
IF exe_opcode(8)='1' THEN --left shift
|
| 803 |
2 |
tobiflex |
bs_C <= ALU(0);
|
| 804 |
|
|
END IF;
|
| 805 |
|
|
ELSIF rot_bits="10" THEN --ROX L/R
|
| 806 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 807 |
|
|
WHEN "00" => --Byte
|
| 808 |
|
|
ALU(7 downto 0) <= result_bs(7 downto 0) OR result_bs(16 downto 9);
|
| 809 |
|
|
bs_C <= result_bs(8) OR result_bs(17);
|
| 810 |
|
|
WHEN "01"|"11" => --Word
|
| 811 |
|
|
ALU(15 downto 0) <= result_bs(15 downto 0) OR result_bs(32 downto 17);
|
| 812 |
|
|
bs_C <= result_bs(16) OR result_bs(33);
|
| 813 |
|
|
WHEN "10" => --Long
|
| 814 |
|
|
ALU <= result_bs(31 downto 0) OR result_bs(64 downto 33);
|
| 815 |
|
|
bs_C <= result_bs(32) OR result_bs(65);
|
| 816 |
|
|
WHEN OTHERS => NULL;
|
| 817 |
|
|
END CASE;
|
| 818 |
|
|
ELSE
|
| 819 |
|
|
IF exe_opcode(8)='0' THEN --right shift
|
| 820 |
|
|
ALU <= result_bs(63 downto 32);
|
| 821 |
|
|
ELSE --left shift
|
| 822 |
|
|
ALU <= result_bs(31 downto 0);
|
| 823 |
|
|
END IF;
|
| 824 |
|
|
END IF;
|
| 825 |
|
|
|
| 826 |
|
|
IF(bs_shift = "000000") THEN
|
| 827 |
|
|
IF rot_bits="10" THEN --ROX L/R
|
| 828 |
6 |
tobiflex |
bs_C <= Flags(4);
|
| 829 |
2 |
tobiflex |
ELSE
|
| 830 |
6 |
tobiflex |
bs_C <= '0';
|
| 831 |
2 |
tobiflex |
END IF;
|
| 832 |
|
|
bs_X <= Flags(4);
|
| 833 |
|
|
bs_V <= '0';
|
| 834 |
|
|
END IF;
|
| 835 |
|
|
|
| 836 |
7 |
tobiflex |
-- calc shift count
|
| 837 |
|
|
bs_shift_mod <= std_logic_vector(unsigned(bs_shift) rem unsigned(ring));
|
| 838 |
|
|
bit_nr <= bs_shift_mod(5 downto 0);
|
| 839 |
|
|
IF exe_opcode(8)='0' THEN --right shift
|
| 840 |
|
|
bit_nr <= ring-bs_shift_mod;
|
| 841 |
|
|
END IF;
|
| 842 |
|
|
IF rot_bits(1)='0' THEN --only shift
|
| 843 |
|
|
IF exe_opcode(8)='0' THEN --right shift
|
| 844 |
|
|
bit_nr <= 32-bs_shift_mod;
|
| 845 |
|
|
END IF;
|
| 846 |
|
|
IF bs_shift = ring THEN
|
| 847 |
|
|
IF exe_opcode(8)='0' THEN --right shift
|
| 848 |
|
|
bit_nr <= 32-ring;
|
| 849 |
|
|
ELSE
|
| 850 |
|
|
bit_nr <= ring;
|
| 851 |
|
|
END IF;
|
| 852 |
|
|
END IF;
|
| 853 |
|
|
IF bs_shift > ring THEN
|
| 854 |
|
|
IF exe_opcode(8)='0' THEN --right shift
|
| 855 |
|
|
bit_nr <= "000000";
|
| 856 |
|
|
bs_C <= '0';
|
| 857 |
|
|
ELSE
|
| 858 |
|
|
bit_nr <= ring+1;
|
| 859 |
|
|
END IF;
|
| 860 |
|
|
END IF;
|
| 861 |
|
|
END IF;
|
| 862 |
|
|
|
| 863 |
2 |
tobiflex |
-- calc ASR sign
|
| 864 |
|
|
BSout <= ALU;
|
| 865 |
|
|
asr_sign <= (OTHERS =>'0');
|
| 866 |
|
|
asr_sign(32 downto 1) <= asr_sign(31 downto 0) OR hot_msb(31 downto 0);
|
| 867 |
|
|
IF rot_bits="00" AND exe_opcode(8)='0' AND msb='1' THEN --ASR
|
| 868 |
|
|
BSout <= ALU or asr_sign(32 downto 1);
|
| 869 |
|
|
IF bs_shift > ring THEN
|
| 870 |
|
|
bs_C <= '1';
|
| 871 |
|
|
END IF;
|
| 872 |
|
|
END IF;
|
| 873 |
|
|
|
| 874 |
|
|
vector(32 downto 0) <= '0'&OP1out;
|
| 875 |
|
|
CASE exe_opcode(7 downto 6) IS
|
| 876 |
|
|
WHEN "00" => --Byte
|
| 877 |
|
|
msb <= OP1out(7);
|
| 878 |
|
|
vector(31 downto 8) <= X"000000";
|
| 879 |
|
|
BSout(31 downto 8) <= X"000000";
|
| 880 |
|
|
IF rot_bits="10" THEN --ROX L/R
|
| 881 |
|
|
vector(8) <= Flags(4);
|
| 882 |
|
|
END IF;
|
| 883 |
|
|
WHEN "01"|"11" => --Word
|
| 884 |
|
|
msb <= OP1out(15);
|
| 885 |
|
|
vector(31 downto 16) <= X"0000";
|
| 886 |
|
|
BSout(31 downto 16) <= X"0000";
|
| 887 |
|
|
IF rot_bits="10" THEN --ROX L/R
|
| 888 |
|
|
vector(16) <= Flags(4);
|
| 889 |
|
|
END IF;
|
| 890 |
|
|
WHEN "10" => --Long
|
| 891 |
|
|
msb <= OP1out(31);
|
| 892 |
|
|
IF rot_bits="10" THEN --ROX L/R
|
| 893 |
|
|
vector(32) <= Flags(4);
|
| 894 |
|
|
END IF;
|
| 895 |
|
|
WHEN OTHERS => NULL;
|
| 896 |
|
|
END CASE;
|
| 897 |
7 |
tobiflex |
result_bs <= std_logic_vector(unsigned('0'&X"00000000"&vector) sll to_integer(unsigned(bit_nr(5 downto 0))));
|
| 898 |
2 |
tobiflex |
|
| 899 |
|
|
end process;
|
| 900 |
|
|
|
| 901 |
|
|
|
| 902 |
|
|
------------------------------------------------------------------------------
|
| 903 |
|
|
--CCR op
|
| 904 |
|
|
------------------------------------------------------------------------------
|
| 905 |
|
|
PROCESS (clk, Reset, exe_opcode, exe_datatype, Flags, last_data_read, OP2out, flag_z, OP1IN, c_out, addsub_ofl,
|
| 906 |
|
|
bcd_a, bcd_a_carry, Vflag_a, exec)
|
| 907 |
|
|
BEGIN
|
| 908 |
|
|
IF exec(andiSR)='1' THEN
|
| 909 |
|
|
CCRin <= Flags AND last_data_read(7 downto 0);
|
| 910 |
|
|
ELSIF exec(eoriSR)='1' THEN
|
| 911 |
|
|
CCRin <= Flags XOR last_data_read(7 downto 0);
|
| 912 |
|
|
ELSIF exec(oriSR)='1' THEN
|
| 913 |
|
|
CCRin <= Flags OR last_data_read(7 downto 0);
|
| 914 |
|
|
ELSE
|
| 915 |
|
|
CCRin <= OP2out(7 downto 0);
|
| 916 |
|
|
END IF;
|
| 917 |
|
|
|
| 918 |
|
|
------------------------------------------------------------------------------
|
| 919 |
|
|
--Flags
|
| 920 |
|
|
------------------------------------------------------------------------------
|
| 921 |
|
|
flag_z <= "000";
|
| 922 |
|
|
IF exec(use_XZFlag)='1' AND flags(2)='0' THEN
|
| 923 |
|
|
flag_z <= "000";
|
| 924 |
|
|
ELSIF OP1in(7 downto 0)="00000000" THEN
|
| 925 |
|
|
flag_z(0) <= '1';
|
| 926 |
|
|
IF OP1in(15 downto 8)="00000000" THEN
|
| 927 |
|
|
flag_z(1) <= '1';
|
| 928 |
|
|
IF OP1in(31 downto 16)="0000000000000000" THEN
|
| 929 |
|
|
flag_z(2) <= '1';
|
| 930 |
|
|
END IF;
|
| 931 |
|
|
END IF;
|
| 932 |
|
|
END IF;
|
| 933 |
|
|
|
| 934 |
|
|
-- --Flags NZVC
|
| 935 |
|
|
IF exe_datatype="00" THEN --Byte
|
| 936 |
|
|
set_flags <= OP1IN(7)&flag_z(0)&addsub_ofl(0)&c_out(0);
|
| 937 |
|
|
IF exec(opcABCD)='1' OR exec(opcSBCD)='1' THEN
|
| 938 |
|
|
set_flags(0) <= bcd_a_carry;
|
| 939 |
|
|
set_flags(1) <= Vflag_a;
|
| 940 |
|
|
END IF;
|
| 941 |
|
|
ELSIF exe_datatype="10" OR exec(opcCPMAW)='1' THEN --Long
|
| 942 |
|
|
set_flags <= OP1IN(31)&flag_z(2)&addsub_ofl(2)&c_out(2);
|
| 943 |
|
|
ELSE --Word
|
| 944 |
|
|
set_flags <= OP1IN(15)&flag_z(1)&addsub_ofl(1)&c_out(1);
|
| 945 |
|
|
END IF;
|
| 946 |
|
|
|
| 947 |
|
|
IF rising_edge(clk) THEN
|
| 948 |
6 |
tobiflex |
IF Reset='1' THEN
|
| 949 |
4 |
tobiflex |
Flags(7 downto 0) <= "00000000";
|
| 950 |
6 |
tobiflex |
ELSIF clkena_lw = '1' THEN
|
| 951 |
2 |
tobiflex |
IF exec(directSR)='1' OR set_stop='1' THEN
|
| 952 |
|
|
Flags(7 downto 0) <= data_read(7 downto 0);
|
| 953 |
|
|
END IF;
|
| 954 |
|
|
IF exec(directCCR)='1' THEN
|
| 955 |
|
|
Flags(7 downto 0) <= data_read(7 downto 0);
|
| 956 |
|
|
END IF;
|
| 957 |
|
|
|
| 958 |
|
|
IF exec(opcROT)='1' AND decodeOPC='0' THEN
|
| 959 |
|
|
asl_VFlag <= ((set_flags(3) XOR rot_rot) OR asl_VFlag);
|
| 960 |
|
|
ELSE
|
| 961 |
|
|
asl_VFlag <= '0';
|
| 962 |
|
|
END IF;
|
| 963 |
|
|
IF exec(to_CCR)='1' THEN
|
| 964 |
|
|
Flags(7 downto 0) <= CCRin(7 downto 0); --CCR
|
| 965 |
|
|
ELSIF Z_error='1' THEN
|
| 966 |
|
|
IF exe_opcode(8)='0' THEN
|
| 967 |
|
|
-- Flags(3 downto 0) <= reg_QA(31)&"000";
|
| 968 |
|
|
Flags(3 downto 0) <= '0'&NOT reg_QA(31)&"00";
|
| 969 |
|
|
ELSE
|
| 970 |
|
|
Flags(3 downto 0) <= "0100";
|
| 971 |
|
|
END IF;
|
| 972 |
|
|
ELSIF exec(no_Flags)='0' THEN
|
| 973 |
|
|
IF exec(opcADD)='1' THEN
|
| 974 |
|
|
Flags(4) <= set_flags(0);
|
| 975 |
|
|
ELSIF exec(opcROT)='1' AND rot_bits/="11" AND exec(rot_nop)='0' THEN
|
| 976 |
|
|
Flags(4) <= rot_X;
|
| 977 |
|
|
ELSIF exec(exec_BS)='1' THEN
|
| 978 |
|
|
Flags(4) <= BS_X;
|
| 979 |
|
|
END IF;
|
| 980 |
|
|
|
| 981 |
|
|
IF (exec(opcADD) OR exec(opcCMP))='1' THEN
|
| 982 |
|
|
Flags(3 downto 0) <= set_flags;
|
| 983 |
|
|
ELSIF exec(opcDIVU)='1' AND DIV_Mode/=3 THEN
|
| 984 |
|
|
IF V_Flag='1' THEN
|
| 985 |
|
|
Flags(3 downto 0) <= "1010";
|
| 986 |
|
|
ELSE
|
| 987 |
|
|
Flags(3 downto 0) <= OP1IN(15)&flag_z(1)&"00";
|
| 988 |
|
|
END IF;
|
| 989 |
|
|
ELSIF exec(write_reminder)='1' AND MUL_Mode/=3 THEN -- z-flag MULU.l
|
| 990 |
|
|
Flags(3) <= set_flags(3);
|
| 991 |
|
|
Flags(2) <= set_flags(2) AND Flags(2);
|
| 992 |
|
|
Flags(1) <= '0';
|
| 993 |
|
|
Flags(0) <= '0';
|
| 994 |
|
|
ELSIF exec(write_lowlong)='1' AND (MUL_Mode=1 OR MUL_Mode=2) THEN -- flag MULU.l
|
| 995 |
|
|
Flags(3) <= set_flags(3);
|
| 996 |
|
|
Flags(2) <= set_flags(2);
|
| 997 |
|
|
Flags(1) <= set_mV_Flag; --V
|
| 998 |
|
|
Flags(0) <= '0';
|
| 999 |
|
|
ELSIF exec(opcOR)='1' OR exec(opcAND)='1' OR exec(opcEOR)='1' OR exec(opcMOVE)='1' OR exec(opcMOVEQ)='1' OR exec(opcSWAP)='1' OR exec(opcBF)='1' OR (exec(opcMULU)='1' AND MUL_Mode/=3) THEN
|
| 1000 |
|
|
Flags(1 downto 0) <= "00";
|
| 1001 |
|
|
Flags(3 downto 2) <= set_flags(3 downto 2);
|
| 1002 |
|
|
IF exec(opcBF)='1' THEN
|
| 1003 |
|
|
Flags(3) <= bf_NFlag;
|
| 1004 |
|
|
END IF;
|
| 1005 |
|
|
ELSIF exec(opcROT)='1' THEN
|
| 1006 |
|
|
Flags(3 downto 2) <= set_flags(3 downto 2);
|
| 1007 |
|
|
Flags(0) <= rot_C;
|
| 1008 |
|
|
IF rot_bits="00" AND ((set_flags(3) XOR rot_rot) OR asl_VFlag)='1' THEN --ASL/ASR
|
| 1009 |
|
|
Flags(1) <= '1';
|
| 1010 |
|
|
ELSE
|
| 1011 |
|
|
Flags(1) <= '0';
|
| 1012 |
|
|
END IF;
|
| 1013 |
|
|
ELSIF exec(exec_BS)='1' THEN
|
| 1014 |
|
|
Flags(3 downto 2) <= set_flags(3 downto 2);
|
| 1015 |
|
|
Flags(0) <= BS_C;
|
| 1016 |
|
|
Flags(1) <= BS_V;
|
| 1017 |
|
|
ELSIF exec(opcBITS)='1' THEN
|
| 1018 |
|
|
Flags(2) <= NOT one_bit_in;
|
| 1019 |
|
|
ELSIF exec(opcCHK)='1' THEN
|
| 1020 |
|
|
IF exe_datatype="01" THEN --Word
|
| 1021 |
|
|
Flags(3) <= OP1out(15);
|
| 1022 |
|
|
ELSE
|
| 1023 |
|
|
Flags(3) <= OP1out(31);
|
| 1024 |
|
|
END IF;
|
| 1025 |
|
|
IF OP1out(15 downto 0)=X"0000" AND (exe_datatype="01" OR OP1out(31 downto 16)=X"0000") THEN
|
| 1026 |
|
|
Flags(2) <='1';
|
| 1027 |
|
|
ELSE
|
| 1028 |
|
|
Flags(2) <='0';
|
| 1029 |
|
|
END IF;
|
| 1030 |
|
|
Flags(1 downto 0) <= "00";
|
| 1031 |
|
|
END IF;
|
| 1032 |
|
|
END IF;
|
| 1033 |
|
|
END IF;
|
| 1034 |
|
|
Flags(7 downto 5) <= "000";
|
| 1035 |
|
|
END IF;
|
| 1036 |
|
|
END PROCESS;
|
| 1037 |
|
|
|
| 1038 |
|
|
---------------------------------------------------------------------------------
|
| 1039 |
|
|
------ MULU/MULS
|
| 1040 |
|
|
---------------------------------------------------------------------------------
|
| 1041 |
|
|
PROCESS (exe_opcode, OP2out, muls_msb, mulu_reg, FAsign, mulu_sign, reg_QA, faktorA, faktorB, result_mulu, signedOP)
|
| 1042 |
|
|
--PROCESS (exec, reg_QA, OP2out, faktorA, faktorB, signedOP)
|
| 1043 |
|
|
BEGIN
|
| 1044 |
|
|
IF MUL_Hardware=1 THEN
|
| 1045 |
|
|
-- IF exe_opcode(15)='1' OR MUL_Mode=0 THEN -- 16 Bit
|
| 1046 |
|
|
IF MUL_Mode=0 THEN -- 16 Bit
|
| 1047 |
|
|
IF signedOP='1' AND reg_QA(15)='1' THEN
|
| 1048 |
|
|
faktorA <= X"FFFFFFFF";
|
| 1049 |
|
|
ELSE
|
| 1050 |
|
|
faktorA <= X"00000000";
|
| 1051 |
|
|
END IF;
|
| 1052 |
|
|
IF signedOP='1' AND OP2out(15)='1' THEN
|
| 1053 |
|
|
faktorB <= X"FFFFFFFF";
|
| 1054 |
|
|
ELSE
|
| 1055 |
|
|
faktorB <= X"00000000";
|
| 1056 |
|
|
END IF;
|
| 1057 |
|
|
result_mulu(63 downto 0) <= (faktorA(15 downto 0) & reg_QA(15 downto 0)) * (faktorB(15 downto 0) & OP2out(15 downto 0));
|
| 1058 |
|
|
ELSE
|
| 1059 |
|
|
IF exe_opcode(15)='1' THEN -- 16 Bit
|
| 1060 |
|
|
IF signedOP='1' AND reg_QA(15)='1' THEN
|
| 1061 |
|
|
faktorA <= X"FFFFFFFF";
|
| 1062 |
|
|
ELSE
|
| 1063 |
|
|
faktorA <= X"00000000";
|
| 1064 |
|
|
END IF;
|
| 1065 |
|
|
IF signedOP='1' AND OP2out(15)='1' THEN
|
| 1066 |
|
|
faktorB <= X"FFFFFFFF";
|
| 1067 |
|
|
ELSE
|
| 1068 |
|
|
faktorB <= X"00000000";
|
| 1069 |
|
|
END IF;
|
| 1070 |
|
|
ELSE
|
| 1071 |
|
|
faktorA(15 downto 0) <= reg_QA(31 downto 16);
|
| 1072 |
|
|
faktorB(15 downto 0) <= OP2out(31 downto 16);
|
| 1073 |
|
|
IF signedOP='1' AND reg_QA(31)='1' THEN
|
| 1074 |
|
|
faktorA(31 downto 16) <= X"FFFF";
|
| 1075 |
|
|
ELSE
|
| 1076 |
|
|
faktorA(31 downto 16) <= X"0000";
|
| 1077 |
|
|
END IF;
|
| 1078 |
|
|
IF signedOP='1' AND OP2out(31)='1' THEN
|
| 1079 |
|
|
faktorB(31 downto 16) <= X"FFFF";
|
| 1080 |
|
|
ELSE
|
| 1081 |
|
|
faktorB(31 downto 16) <= X"0000";
|
| 1082 |
|
|
END IF;
|
| 1083 |
|
|
END IF;
|
| 1084 |
|
|
result_mulu(127 downto 0) <= (faktorA(31 downto 16) & faktorA(31 downto 0) & reg_QA(15 downto 0)) * (faktorB(31 downto 16) & faktorB(31 downto 0) & OP2out(15 downto 0));
|
| 1085 |
|
|
END IF;
|
| 1086 |
|
|
-- END PROCESS;
|
| 1087 |
|
|
-------------------------------------------------------------------------------
|
| 1088 |
|
|
---- MULU/MULS
|
| 1089 |
|
|
-------------------------------------------------------------------------------
|
| 1090 |
|
|
--PROCESS (exe_opcode, OP2out, muls_msb, mulu_reg, FAsign, mulu_sign, reg_QA, faktorB, result_mulu, signedOP)
|
| 1091 |
|
|
-- BEGIN
|
| 1092 |
|
|
ELSE
|
| 1093 |
|
|
IF (signedOP='1' AND faktorB(31)='1') OR FAsign='1' THEN
|
| 1094 |
|
|
muls_msb <= mulu_reg(63);
|
| 1095 |
|
|
ELSE
|
| 1096 |
|
|
muls_msb <= '0';
|
| 1097 |
|
|
END IF;
|
| 1098 |
|
|
|
| 1099 |
|
|
IF signedOP='1' AND faktorB(31)='1' THEN
|
| 1100 |
|
|
mulu_sign <= '1';
|
| 1101 |
|
|
ELSE
|
| 1102 |
|
|
mulu_sign <= '0';
|
| 1103 |
|
|
END IF;
|
| 1104 |
|
|
|
| 1105 |
|
|
IF MUL_Mode=0 THEN -- 16 Bit
|
| 1106 |
|
|
result_mulu(63 downto 32) <= muls_msb&mulu_reg(63 downto 33);
|
| 1107 |
|
|
result_mulu(15 downto 0) <= 'X'&mulu_reg(15 downto 1);
|
| 1108 |
|
|
IF mulu_reg(0)='1' THEN
|
| 1109 |
|
|
IF FAsign='1' THEN
|
| 1110 |
|
|
result_mulu(63 downto 47) <= (muls_msb&mulu_reg(63 downto 48)-(mulu_sign&faktorB(31 downto 16)));
|
| 1111 |
|
|
ELSE
|
| 1112 |
|
|
result_mulu(63 downto 47) <= (muls_msb&mulu_reg(63 downto 48)+(mulu_sign&faktorB(31 downto 16)));
|
| 1113 |
|
|
END IF;
|
| 1114 |
|
|
END IF;
|
| 1115 |
|
|
ELSE -- 32 Bit
|
| 1116 |
|
|
result_mulu(63 downto 0) <= muls_msb&mulu_reg(63 downto 1);
|
| 1117 |
|
|
IF mulu_reg(0)='1' THEN
|
| 1118 |
|
|
IF FAsign='1' THEN
|
| 1119 |
|
|
result_mulu(63 downto 31) <= (muls_msb&mulu_reg(63 downto 32)-(mulu_sign&faktorB));
|
| 1120 |
|
|
ELSE
|
| 1121 |
|
|
result_mulu(63 downto 31) <= (muls_msb&mulu_reg(63 downto 32)+(mulu_sign&faktorB));
|
| 1122 |
|
|
END IF;
|
| 1123 |
|
|
END IF;
|
| 1124 |
|
|
END IF;
|
| 1125 |
|
|
IF exe_opcode(15)='1' OR MUL_Mode=0 THEN
|
| 1126 |
|
|
faktorB(31 downto 16) <= OP2out(15 downto 0);
|
| 1127 |
|
|
faktorB(15 downto 0) <= (OTHERS=>'0');
|
| 1128 |
|
|
ELSE
|
| 1129 |
|
|
faktorB <= OP2out;
|
| 1130 |
|
|
END IF;
|
| 1131 |
|
|
END IF;
|
| 1132 |
|
|
IF (result_mulu(63 downto 32)=X"00000000" AND (signedOP='0' OR result_mulu(31)='0')) OR
|
| 1133 |
|
|
(result_mulu(63 downto 32)=X"FFFFFFFF" AND signedOP='1' AND result_mulu(31)='1') THEN
|
| 1134 |
|
|
set_mV_Flag <= '0';
|
| 1135 |
|
|
ELSE
|
| 1136 |
|
|
set_mV_Flag <= '1';
|
| 1137 |
|
|
END IF;
|
| 1138 |
|
|
END PROCESS;
|
| 1139 |
|
|
|
| 1140 |
|
|
PROCESS (clk)
|
| 1141 |
|
|
BEGIN
|
| 1142 |
|
|
IF rising_edge(clk) THEN
|
| 1143 |
|
|
IF clkena_lw='1' THEN
|
| 1144 |
|
|
IF MUL_Hardware=0 THEN
|
| 1145 |
|
|
IF micro_state=mul1 THEN
|
| 1146 |
|
|
mulu_reg(63 downto 32) <= (OTHERS=>'0');
|
| 1147 |
|
|
IF divs='1' AND ((exe_opcode(15)='1' AND reg_QA(15)='1') OR (exe_opcode(15)='0' AND reg_QA(31)='1')) THEN --MULS Neg faktor
|
| 1148 |
|
|
FAsign <= '1';
|
| 1149 |
|
|
mulu_reg(31 downto 0) <= 0-reg_QA;
|
| 1150 |
|
|
ELSE
|
| 1151 |
|
|
FAsign <= '0';
|
| 1152 |
|
|
mulu_reg(31 downto 0) <= reg_QA;
|
| 1153 |
|
|
END IF;
|
| 1154 |
|
|
ELSIF exec(opcMULU)='0' THEN
|
| 1155 |
|
|
mulu_reg(63 downto 32) <= (OTHERS=>'-');
|
| 1156 |
|
|
mulu_reg <= result_mulu(63 downto 0);
|
| 1157 |
|
|
END IF;
|
| 1158 |
|
|
ELSE
|
| 1159 |
|
|
mulu_reg(31 downto 0) <= result_mulu(63 downto 32);
|
| 1160 |
|
|
END IF;
|
| 1161 |
|
|
END IF;
|
| 1162 |
|
|
END IF;
|
| 1163 |
|
|
END PROCESS;
|
| 1164 |
|
|
|
| 1165 |
|
|
-------------------------------------------------------------------------------
|
| 1166 |
|
|
---- DIVU/DIVS
|
| 1167 |
|
|
-------------------------------------------------------------------------------
|
| 1168 |
|
|
|
| 1169 |
|
|
PROCESS (execOPC, OP1out, OP2out, div_reg, div_neg, div_bit, div_sub, div_quot, OP1_sign, div_over, result_div, reg_QA, opcode, sndOPC, divs, exe_opcode, reg_QB,
|
| 1170 |
|
|
signedOP, nozero, div_qsign, OP2outext)
|
| 1171 |
|
|
BEGIN
|
| 1172 |
|
|
divs <= (opcode(15) AND opcode(8)) OR (NOT opcode(15) AND sndOPC(11));
|
| 1173 |
|
|
divisor(15 downto 0) <= (OTHERS=> '0');
|
| 1174 |
|
|
divisor(63 downto 32) <= (OTHERS=> divs AND reg_QA(31));
|
| 1175 |
|
|
IF exe_opcode(15)='1' OR DIV_Mode=0 THEN
|
| 1176 |
|
|
divisor(47 downto 16) <= reg_QA;
|
| 1177 |
|
|
ELSE
|
| 1178 |
|
|
divisor(31 downto 0) <= reg_QA;
|
| 1179 |
|
|
IF exe_opcode(14)='1' AND sndOPC(10)='1' THEN
|
| 1180 |
|
|
divisor(63 downto 32) <= reg_QB;
|
| 1181 |
|
|
END IF;
|
| 1182 |
|
|
END IF;
|
| 1183 |
|
|
IF signedOP='1' OR opcode(15)='0' THEN
|
| 1184 |
|
|
OP2outext <= OP2out(31 downto 16);
|
| 1185 |
|
|
ELSE
|
| 1186 |
|
|
OP2outext <= (OTHERS=> '0');
|
| 1187 |
|
|
END IF;
|
| 1188 |
|
|
IF signedOP='1' AND OP2out(31) ='1' THEN
|
| 1189 |
|
|
div_sub <= (div_reg(63 downto 31))+('1'&OP2out(31 downto 0));
|
| 1190 |
|
|
ELSE
|
| 1191 |
|
|
div_sub <= (div_reg(63 downto 31))-('0'&OP2outext(15 downto 0)&OP2out(15 downto 0));
|
| 1192 |
|
|
END IF;
|
| 1193 |
|
|
IF DIV_Mode=0 THEN
|
| 1194 |
|
|
div_bit <= div_sub(16);
|
| 1195 |
|
|
ELSE
|
| 1196 |
|
|
div_bit <= div_sub(32);
|
| 1197 |
|
|
END IF;
|
| 1198 |
|
|
IF div_bit='1' THEN
|
| 1199 |
|
|
div_quot(63 downto 32) <= div_reg(62 downto 31);
|
| 1200 |
|
|
ELSE
|
| 1201 |
|
|
div_quot(63 downto 32) <= div_sub(31 downto 0);
|
| 1202 |
|
|
END IF;
|
| 1203 |
|
|
div_quot(31 downto 0) <= div_reg(30 downto 0)&NOT div_bit;
|
| 1204 |
|
|
|
| 1205 |
|
|
|
| 1206 |
|
|
IF ((nozero='1' AND signedOP='1' AND (OP2out(31) XOR OP1_sign XOR div_neg XOR div_qsign)='1' ) --Overflow DIVS
|
| 1207 |
|
|
OR (signedOP='0' AND div_over(32)='0')) AND DIV_Mode/=3 THEN --Overflow DIVU
|
| 1208 |
|
|
set_V_Flag <= '1';
|
| 1209 |
|
|
ELSE
|
| 1210 |
|
|
set_V_Flag <= '0';
|
| 1211 |
|
|
END IF;
|
| 1212 |
|
|
END PROCESS;
|
| 1213 |
|
|
|
| 1214 |
|
|
PROCESS (clk)
|
| 1215 |
|
|
BEGIN
|
| 1216 |
|
|
IF rising_edge(clk) THEN
|
| 1217 |
|
|
IF clkena_lw='1' THEN
|
| 1218 |
|
|
V_Flag <= set_V_Flag;
|
| 1219 |
|
|
signedOP <= divs;
|
| 1220 |
|
|
IF micro_state=div1 THEN
|
| 1221 |
|
|
nozero <= '0';
|
| 1222 |
|
|
IF divs='1' AND divisor(63)='1' THEN -- Neg divisor
|
| 1223 |
|
|
OP1_sign <= '1';
|
| 1224 |
|
|
div_reg <= 0-divisor;
|
| 1225 |
|
|
ELSE
|
| 1226 |
|
|
OP1_sign <= '0';
|
| 1227 |
|
|
div_reg <= divisor;
|
| 1228 |
|
|
END IF;
|
| 1229 |
|
|
ELSE
|
| 1230 |
|
|
div_reg <= div_quot;
|
| 1231 |
|
|
nozero <= NOT div_bit OR nozero;
|
| 1232 |
|
|
END IF;
|
| 1233 |
|
|
IF micro_state=div2 THEN
|
| 1234 |
|
|
div_qsign <= NOT div_bit;
|
| 1235 |
|
|
div_neg <= signedOP AND (OP2out(31) XOR OP1_sign);
|
| 1236 |
|
|
IF DIV_Mode=0 THEN
|
| 1237 |
|
|
div_over(32 downto 16) <= ('0'&div_reg(47 downto 32))-('0'&OP2out(15 downto 0));
|
| 1238 |
|
|
ELSE
|
| 1239 |
|
|
div_over <= ('0'&div_reg(63 downto 32))-('0'&OP2out);
|
| 1240 |
|
|
END IF;
|
| 1241 |
|
|
END IF;
|
| 1242 |
|
|
IF exec(write_reminder)='0' THEN
|
| 1243 |
|
|
-- IF exec_DIVU='0' THEN
|
| 1244 |
|
|
IF div_neg='1' THEN
|
| 1245 |
|
|
result_div(31 downto 0) <= 0-div_quot(31 downto 0);
|
| 1246 |
|
|
ELSE
|
| 1247 |
|
|
result_div(31 downto 0) <= div_quot(31 downto 0);
|
| 1248 |
|
|
END IF;
|
| 1249 |
|
|
|
| 1250 |
|
|
IF OP1_sign='1' THEN
|
| 1251 |
|
|
result_div(63 downto 32) <= 0-div_quot(63 downto 32);
|
| 1252 |
|
|
ELSE
|
| 1253 |
|
|
result_div(63 downto 32) <= div_quot(63 downto 32);
|
| 1254 |
|
|
END IF;
|
| 1255 |
|
|
END IF;
|
| 1256 |
|
|
END IF;
|
| 1257 |
|
|
END IF;
|
| 1258 |
|
|
END PROCESS;
|
| 1259 |
|
|
END;
|
