+-- `Deep Thought', a softcore CPU implemented on a FPGA
+--
+-- Copyright (C) 2010 Markus Hofstaetter <markus.manrow@gmx.at>
+-- Copyright (C) 2010 Martin Perner <e0725782@student.tuwien.ac.at>
+-- Copyright (C) 2010 Stefan Rebernig <stefan.rebernig@gmail.com>
+-- Copyright (C) 2010 Manfred Schwarz <e0725898@student.tuwien.ac.at>
+-- Copyright (C) 2010 Bernhard Urban <lewurm@gmail.com>
+--
+-- 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
+-- (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, see <http://www.gnu.org/licenses/>.
+
library IEEE;
use IEEE.std_logic_1164.all;
subtype word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
subtype gp_register_t is word_t;
-
+
+ subtype byte_en_t is std_logic_vector((gp_register_t'length/byte_t'length-1) downto 0);
constant REG_ZERO : gp_register_t := (others => '0');
constant INSTR_ADDR_WIDTH : INTEGER := 32;
- constant PHYS_INSTR_ADDR_WIDTH : INTEGER := 11;
+ constant PHYS_INSTR_ADDR_WIDTH : INTEGER := 10;
+ constant ROM_INSTR_ADDR_WIDTH : INTEGER := 7;
constant REG_ADDR_WIDTH : INTEGER := 4;
- constant DATA_ADDR_WIDTH : INTEGER := 11;
+ constant DATA_ADDR_WIDTH : INTEGER := 10;
constant PHYS_DATA_ADDR_WIDTH : INTEGER := 32;
constant NUM_OP_OPT_WIDTH : INTEGER := 6;
constant COND_WIDTH : INTEGER := 4;
+ constant DATA_END_ADDR : integer := ((2**DATA_ADDR_WIDTH)-1);
+ constant ROM_USE : std_logic := '1';
+ constant RAM_USE : std_logic := '0';
subtype instruction_word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
subtype instruction_addr_t is std_logic_vector(INSTR_ADDR_WIDTH-1 downto 0);
+ subtype instr_addr_t is instruction_addr_t;
subtype gp_addr_t is std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
subtype data_ram_word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
constant SUB_OPT : integer := 1;
constant ARITH_OPT : integer := 1;
+ constant HWORD_OPT : integer := 1;
+ constant PUSH_OPT : integer := 1;
+ constant LOW_HIGH_OPT : integer := 1;
+ constant DIRECT_JUMP_OPT : integer := 1;
constant CARRY_OPT : integer := 2;
-
+ constant BYTE_OPT : integer := 2;
+ constant LDI_REPLACE_OPT : integer := 2;
+ constant PWREN_OPT : integer := 2;
+
constant RIGHT_OPT : integer := 3;
+ constant JMP_REG_OPT : integer := 3;
+ constant ST_OPT : integer := 3; -- store opt
+ constant RET_OPT : integer := 3;
constant NO_PSW_OPT : integer := 4;--no sharing
constant NO_DST_OPT : integer := 5; --no sharing
- type op_info_t is (ADDSUB_OP,AND_OP,OR_OP, XOR_OP,SHIFT_OP, LDST_OP);
+ type op_info_t is (ADDSUB_OP,AND_OP,OR_OP, XOR_OP,SHIFT_OP, LDST_OP, JMP_OP, JMP_ST_OP, STACK_OP);
subtype op_opt_t is std_logic_vector(NUM_OP_OPT_WIDTH-1 downto 0);
+
+ type interrupt_t is (IDLE, UART);
-
+ constant UART_INT_EN_BIT : integer := 1;
+ constant GLOBAL_INT_EN_BIT : integer := 0;
+
+ constant UART_INT_VECTOR : std_logic_vector(PHYS_INSTR_ADDR_WIDTH-1 downto 0) := (0 => '1', others => '0');
+
type instruction_rec is record
predicates : std_logic_vector(3 downto 0);
jmptype : std_logic_vector(1 downto 0);
- high_low, fill, signext, bp: std_logic;
+ high_low, fill, signext, bp, int: std_logic;
op_detail : op_opt_t;
op_group : op_info_t;
end record;
+
type read_through_write_rec is record
rtw_reg : gp_register_t;
brpr : std_logic;
displacement : gp_register_t;
+ prog_cnt : instr_addr_t;
src1 : gp_register_t;
src2 : gp_register_t;
dmem_write_en : std_logic; --ureg
hword : std_logic; --ureg
byte_s : std_logic;
+ byte_en : byte_en_t;
+ data : gp_register_t;
end record;
+ type exec2wb_rec is record
+ result : gp_register_t; --reg (alu result or jumpaddr)
+ result_addr : gp_addr_t; --reg
+ address : word_t; --ureg
+ ram_data : word_t; --ureg
+ alu_jmp : std_logic; --reg
+ br_pred : std_logic; --reg
+ write_en : std_logic; --reg (register file) bei jump 1 wenn addr in result
+ dmem_en : std_logic; --ureg (jump addr in mem or in address)
+ dmem_write_en : std_logic; --ureg
+ hword : std_logic; --ureg
+ byte_s : std_logic; --ureg
+ end record;
function inc(value : in std_logic_vector; constant by : in integer := 1) return std_logic_vector;
function log2c(constant value : in integer range 0 to integer'high) return integer;
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