define.v

用VHDL设计具有简单MIPS功能的源码

//******************************************************************************
//
// define.v
//
// all design constant
// 
//-------------------------alu_operation_parameters
//operation code and function code
//R-Type
`define opcode_rtype	6'b000000
`define funcode_add	6'b100000
`define funcode_sub	6'b100010
`define funcode_and	6'b100100
`define funcode_or	6'b100101
`define funcode_slt	6'b101010
//I-Type
`define opcode_lw	6'b100011
`define opcode_sw	6'b101011
`define opcode_addi	6'b001000
`define opcode_andi	6'b001100
`define opcode_ori	6'b001101
`define opcode_beq	6'b000100
`define opcode_bne	6'b000101
//J-Type
`define opcode_j	6'b000010

//control signal Aluop
`define aluop_add	4'b0001
`define aluop_sub	4'b0010
`define aluop_and	4'b0011
`define aluop_or	4'b0100
`define aluop_slt	4'b0101
`define aluop_lw	4'b0110
`define aluop_sw	4'b0111
`define aluop_addi	4'b1000
`define aluop_andi	4'b1001
`define aluop_ori	4'b1010
`define aluop_beq	4'b1011
`define aluop_bne	4'b1100



`define a_and_b 6'b100000
`define b_compl 6'b010000
`define a_input 6'b001000
`define a_add_b 6'b000100
`define b_input 6'b000010
`define a_sub_b 6'b000001
//-------------------------control_parameters(state)
`define do_initials 4'd1
`define instr_fetch 4'd2
`define do_one_bytes 4'd3
`define opnd_fetch 4'd4
`define do_indirect 4'd5
`define do_two_bytes 4'd6
`define do_jsr 4'd7
`define continue_jsr 4'd8
`define do_branch 4'd9
//-----------------------control_parameters(code)
`define single_byte_instructions 4'b1110
`define hlt 4'b0000
`define cla 4'b0001
`define cma 4'b0010
`define cmc 4'b0100
`define asl 4'b1000
`define asr 4'b1001
`define jsr 3'b110
`define bra 4'b1111
`define indirect 1'b1
`define jmp 3'b100
`define sta 3'b101
`define lda 3'b000
`define ann 3'b001
`define add 3'b010
`define sbb 3'b011
`define jsr_or_bra 2'b11