3 use IEEE.std_logic_1164.all;
4 use IEEE.numeric_std.all;
10 constant WORD_WIDTH : INTEGER := 32;
11 constant HWORD_WIDTH : INTEGER := 16;
12 constant BYTE_WIDTH : INTEGER := 8;
13 constant OPCODE_WIDTH : INTEGER := 5;
14 constant DISPL_WIDTH : INTEGER := 15;
16 subtype byte_t is std_logic_vector(BYTE_WIDTH-1 downto 0);
17 subtype hword_t is std_logic_vector(HWORD_WIDTH-1 downto 0);
18 subtype word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
20 subtype gp_register_t is word_t;
23 constant REG_ZERO : gp_register_t := (others => '0');
25 constant INSTR_ADDR_WIDTH : INTEGER := 32;
26 constant PHYS_INSTR_ADDR_WIDTH : INTEGER := 11;
27 constant REG_ADDR_WIDTH : INTEGER := 4;
28 constant DATA_ADDR_WIDTH : INTEGER := 11;
29 constant PHYS_DATA_ADDR_WIDTH : INTEGER := 32;
31 constant NUM_OP_OPT_WIDTH : INTEGER := 6;
32 constant COND_WIDTH : INTEGER := 4;
33 constant DATA_END_ADDR : integer := ((2**DATA_ADDR_WIDTH)-1);
36 subtype instruction_word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
37 subtype instruction_addr_t is std_logic_vector(INSTR_ADDR_WIDTH-1 downto 0);
38 subtype instr_addr_t is instruction_addr_t;
40 subtype gp_addr_t is std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
41 subtype data_ram_word_t is std_logic_vector(WORD_WIDTH-1 downto 0);
42 subtype data_ram_addr_t is std_logic_vector(DATA_ADDR_WIDTH-1 downto 0);
44 subtype opcode_t is std_logic_vector(OPCODE_WIDTH-1 downto 0);
45 subtype condition_t is std_logic_vector(COND_WIDTH-1 downto 0);
47 --Opcode consits of decoded group information type and option bits
48 --currently not complete, might need option increase too.
49 --IMMEDIATE always in right_operand (src2)
51 constant IMM_OPT : integer := 0; -- no sharing
53 constant SUB_OPT : integer := 1;
54 constant ARITH_OPT : integer := 1;
56 constant CARRY_OPT : integer := 2;
58 constant RIGHT_OPT : integer := 3;
59 constant JMP_REG_OPT : integer := 3;
60 constant ST_OPT : integer := 3; -- store opt
61 constant RET_OPT : integer := 3;
63 constant NO_PSW_OPT : integer := 4;--no sharing
64 constant NO_DST_OPT : integer := 5; --no sharing
66 type op_info_t is (ADDSUB_OP,AND_OP,OR_OP, XOR_OP,SHIFT_OP, LDST_OP, JMP_OP, JMP_ST_OP);
67 subtype op_opt_t is std_logic_vector(NUM_OP_OPT_WIDTH-1 downto 0);
70 type instruction_rec is record
72 predicates : std_logic_vector(3 downto 0);
76 reg_dest_addr : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
77 reg_src1_addr : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
78 reg_src2_addr : std_logic_vector(REG_ADDR_WIDTH-1 downto 0);
80 immediate : std_logic_vector(WORD_WIDTH-1 downto 0);
82 displacement : gp_register_t;
84 jmptype : std_logic_vector(1 downto 0);
86 high_low, fill, signext, bp: std_logic;
94 type read_through_write_rec is record
96 rtw_reg : gp_register_t;
99 immediate : gp_register_t;
101 reg1_addr : gp_addr_t;
102 reg2_addr : gp_addr_t;
106 type dec_op is record
107 condition : condition_t;
108 op_group : op_info_t;
109 op_detail : op_opt_t;
112 displacement : gp_register_t;
113 prog_cnt : instr_addr_t;
115 src1 : gp_register_t;
116 src2 : gp_register_t;
125 type writeback_rec is record
126 -- result : in gp_register_t; --reg (alu result or jumpaddr)
127 -- result_addr : in gp_addr_t; --reg
128 address : word_t; --ureg
129 -- alu_jmp : in std_logic; --reg
130 -- br_pred : in std_logic; --reg
131 -- write_en : in std_logic; --reg (register file)
132 dmem_en : std_logic; --ureg (jump addr in mem or in address)
133 dmem_write_en : std_logic; --ureg
134 hword : std_logic; --ureg
139 function inc(value : in std_logic_vector; constant by : in integer := 1) return std_logic_vector;
140 function log2c(constant value : in integer range 0 to integer'high) return integer;
141 end package common_pkg;
143 package body common_pkg is
145 function inc(value : in std_logic_vector; constant by : in integer := 1) return std_logic_vector is
147 return std_logic_vector(UNSIGNED(value)+by);
150 function log2c(constant value : in integer range 0 to integer'high) return integer is
151 variable ret_value : integer;
152 variable cur_value : integer;
157 while cur_value < value loop
158 ret_value := ret_value + 1;
159 cur_value := cur_value * 2;
164 end package body common_pkg;