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Gehstock.Mist_FPGA/common/CPU/65C02/reg_pc.vhd
2022-06-20 17:28:35 +02:00

239 lines
8.2 KiB
VHDL

-- VHDL Entity r65c02_tc.reg_pc.symbol
--
-- Created:
-- by - eda.UNKNOWN (ENTW-7HPZ200)
-- at - 11:59:59 06.09.2018
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2016.2 (Build 5)
--
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
entity reg_pc is
port(
adr_i : in std_logic_vector (15 downto 0);
clk_clk_i : in std_logic;
ld_i : in std_logic_vector (1 downto 0);
ld_pc_i : in std_logic;
offset_i : in std_logic_vector (15 downto 0);
rst_rst_n_i : in std_logic;
sel_pc_in_i : in std_logic;
sel_pc_val_i : in std_logic_vector (1 downto 0);
ce : in std_logic;
adr_nxt_pc_o : out std_logic_vector (15 downto 0);
adr_pc_o : out std_logic_vector (15 downto 0)
);
-- Declarations
end reg_pc ;
-- (C) 2008 - 2018 Jens Gutschmidt
-- (email: opencores@vivare-services.com)
--
-- Versions:
-- Revision 1.7 2013/07/21 11:11:00 jens
-- - Changing the title block and internal revision history
--
-- Revision 1.6 2009/01/04 10:20:47 eda
-- Changes for cosmetic issues only
--
-- Revision 1.5 2009/01/04 09:23:10 eda
-- - Delete unused nets and blocks (same as R6502_TC)
-- - Rename blocks
--
-- Revision 1.4 2009/01/03 16:53:02 eda
-- - Unused nets and blocks deleted
-- - Renamed blocks
--
-- Revision 1.3 2009/01/03 16:42:02 eda
-- - Unused nets and blocks deleted
-- - Renamed blocks
--
-- Revision 1.2 2008/12/31 19:31:24 eda
-- Production Release
--
--
--
-- VHDL Architecture r65c02_tc.reg_pc.struct
--
-- Created:
-- by - eda.UNKNOWN (ENTW-7HPZ200)
-- at - 11:59:59 06.09.2018
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2016.2 (Build 5)
--
-- COPYRIGHT (C) 2008 - 2018 by Jens Gutschmidt
--
-- This program 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 3 of the License, or 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, see <http://www.gnu.org/licenses/>.
--
--
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
architecture struct of reg_pc is
-- Architecture declarations
-- Internal signal declarations
signal adr_pc_high_o_i : std_logic_vector(7 downto 0);
signal adr_pc_low_o_i : std_logic_vector(7 downto 0);
signal adr_pc_o_i : std_logic_vector(15 downto 0);
signal ci_o_i : std_logic;
signal cout_pc_o_i : std_logic;
signal load3_o_i : std_logic;
signal load_o_i : std_logic;
signal offset_high_o_i : std_logic_vector(7 downto 0);
signal offset_low_o_i : std_logic_vector(7 downto 0);
signal val_o_i : std_logic_vector(7 downto 0);
signal val_one : std_logic_vector(7 downto 0);
signal val_zero : std_logic_vector(7 downto 0);
-- Implicit buffer signal declarations
signal adr_nxt_pc_o_internal : std_logic_vector (15 downto 0);
signal adr_pc_o_internal : std_logic_vector (15 downto 0);
-- ModuleWare signal declarations(v1.12) for instance 'U_0' of 'adff'
signal mw_U_0reg_cval : std_logic_vector(7 downto 0);
-- ModuleWare signal declarations(v1.12) for instance 'U_4' of 'adff'
signal mw_U_4reg_cval : std_logic_vector(7 downto 0);
-- ModuleWare signal declarations(v1.12) for instance 'U_3' of 'split'
signal mw_U_3temp_din : std_logic_vector(15 downto 0);
-- ModuleWare signal declarations(v1.12) for instance 'U_5' of 'split'
signal mw_U_5temp_din : std_logic_vector(15 downto 0);
begin
-- ModuleWare code(v1.12) for instance 'U_2' of 'add'
u_2combo_proc: process (adr_pc_low_o_i, val_o_i)
variable temp_din0 : std_logic_vector(8 downto 0);
variable temp_din1 : std_logic_vector(8 downto 0);
variable temp_sum : unsigned(8 downto 0);
variable temp_carry : std_logic;
begin
temp_din0 := '0' & adr_pc_low_o_i;
temp_din1 := '0' & val_o_i;
temp_carry := '0';
temp_sum := unsigned(temp_din0) + unsigned(temp_din1) + temp_carry;
adr_nxt_pc_o_internal(7 DOWNTO 0) <= conv_std_logic_vector(temp_sum(7 downto 0),8);
cout_pc_o_i <= temp_sum(8) ;
end process u_2combo_proc;
-- ModuleWare code(v1.12) for instance 'U_11' of 'add'
u_11combo_proc: process (adr_pc_high_o_i, offset_high_o_i, ci_o_i)
variable temp_din0 : std_logic_vector(8 downto 0);
variable temp_din1 : std_logic_vector(8 downto 0);
variable temp_sum : unsigned(8 downto 0);
variable temp_carry : std_logic;
begin
temp_din0 := '0' & adr_pc_high_o_i;
temp_din1 := '0' & offset_high_o_i;
temp_carry := ci_o_i;
temp_sum := unsigned(temp_din0) + unsigned(temp_din1) + temp_carry;
adr_nxt_pc_o_internal(15 DOWNTO 8) <= conv_std_logic_vector(temp_sum(7 downto 0),8);
end process u_11combo_proc;
-- ModuleWare code(v1.12) for instance 'U_0' of 'adff'
adr_pc_o_internal(7 DOWNTO 0) <= mw_U_0reg_cval;
u_0seq_proc: process (clk_clk_i, ce, rst_rst_n_i)
begin
if (rst_rst_n_i = '0') then
mw_U_0reg_cval <= "00000000";
elsif (clk_clk_i'event and clk_clk_i='1' and ce = '1') then
if (load_o_i = '1') then
mw_U_0reg_cval <= adr_nxt_pc_o_internal(7 DOWNTO 0);
end if;
end if;
end process u_0seq_proc;
-- ModuleWare code(v1.12) for instance 'U_4' of 'adff'
adr_pc_o_internal(15 DOWNTO 8) <= mw_U_4reg_cval;
u_4seq_proc: process (clk_clk_i, ce, rst_rst_n_i)
begin
if (rst_rst_n_i = '0') then
mw_U_4reg_cval <= "00000000";
elsif (clk_clk_i'event and clk_clk_i='1' and ce = '1') then
if (load3_o_i = '1') then
mw_U_4reg_cval <= adr_nxt_pc_o_internal(15 DOWNTO 8);
end if;
end if;
end process u_4seq_proc;
-- ModuleWare code(v1.12) for instance 'U_6' of 'and'
load_o_i <= ld_pc_i and ld_i(0);
-- ModuleWare code(v1.12) for instance 'U_7' of 'and'
load3_o_i <= ld_pc_i and ld_i(1);
-- ModuleWare code(v1.12) for instance 'U_10' of 'and'
ci_o_i <= cout_pc_o_i and ld_pc_i;
-- ModuleWare code(v1.12) for instance 'U_1' of 'constval'
val_zero <= "00000000";
-- ModuleWare code(v1.12) for instance 'U_9' of 'constval'
val_one <= "00000001";
-- ModuleWare code(v1.12) for instance 'U_8' of 'mux'
u_8combo_proc: process(adr_pc_o_internal, adr_i, sel_pc_in_i)
begin
case sel_pc_in_i is
when '0' => adr_pc_o_i <= adr_pc_o_internal;
when '1' => adr_pc_o_i <= adr_i;
when others => adr_pc_o_i <= (others => 'X');
end case;
end process u_8combo_proc;
-- ModuleWare code(v1.12) for instance 'U_13' of 'mux'
u_13combo_proc: process(val_one, val_zero, offset_low_o_i,
sel_pc_val_i)
begin
case sel_pc_val_i is
when "00" => val_o_i <= val_one;
when "01" => val_o_i <= val_zero;
when "10" => val_o_i <= offset_low_o_i;
when "11" => val_o_i <= val_zero;
when others => val_o_i <= (others => 'X');
end case;
end process u_13combo_proc;
-- ModuleWare code(v1.12) for instance 'U_3' of 'split'
mw_U_3temp_din <= adr_pc_o_i;
u_3combo_proc: process (mw_U_3temp_din)
variable temp_din: std_logic_vector(15 downto 0);
begin
temp_din := mw_U_3temp_din(15 downto 0);
adr_pc_low_o_i <= temp_din(7 downto 0);
adr_pc_high_o_i <= temp_din(15 downto 8);
end process u_3combo_proc;
-- ModuleWare code(v1.12) for instance 'U_5' of 'split'
mw_U_5temp_din <= offset_i;
u_5combo_proc: process (mw_U_5temp_din)
variable temp_din: std_logic_vector(15 downto 0);
begin
temp_din := mw_U_5temp_din(15 downto 0);
offset_low_o_i <= temp_din(7 downto 0);
offset_high_o_i <= temp_din(15 downto 8);
end process u_5combo_proc;
-- Instance port mappings.
-- Implicit buffered output assignments
adr_nxt_pc_o <= adr_nxt_pc_o_internal;
adr_pc_o <= adr_pc_o_internal;
end struct;