| Line 64... |
Line 64... |
begin
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begin
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control_proc: process(opcode, intr_signal, pause_in)
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control_proc: process(opcode, intr_signal, pause_in)
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variable op, func : std_logic_vector(5 downto 0);
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variable op, func : std_logic_vector(5 downto 0);
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variable rs, rt, rd : std_logic_vector(5 downto 0);
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variable rs, rt, rd : std_logic_vector(5 downto 0);
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variable re, rtx : std_logic_vector(4 downto 0);
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variable rtx : std_logic_vector(4 downto 0);
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variable imm : std_logic_vector(15 downto 0);
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variable imm : std_logic_vector(15 downto 0);
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variable alu_function : alu_function_type;
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variable alu_function : alu_function_type;
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variable shift_function : shift_function_type;
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variable shift_function : shift_function_type;
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variable mult_function : mult_function_type;
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variable mult_function : mult_function_type;
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variable a_source : a_source_type;
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variable a_source : a_source_type;
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| Line 90... |
Line 90... |
op := opcode(31 downto 26);
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op := opcode(31 downto 26);
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rs := '0' & opcode(25 downto 21);
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rs := '0' & opcode(25 downto 21);
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rt := '0' & opcode(20 downto 16);
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rt := '0' & opcode(20 downto 16);
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rtx := opcode(20 downto 16);
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rtx := opcode(20 downto 16);
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rd := '0' & opcode(15 downto 11);
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rd := '0' & opcode(15 downto 11);
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re := opcode(10 downto 6);
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func := opcode(5 downto 0);
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func := opcode(5 downto 0);
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imm := opcode(15 downto 0);
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imm := opcode(15 downto 0);
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|
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case op is
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case op is
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when "000000" => --00 SPECIAL
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when "000000" => --SPECIAL
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case func is
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case func is
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when "000000" => --00 SLL r[rd]=r[rt]<<re;
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when "000000" => --SLL r[rd]=r[rt]<<re;
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a_source := a_from_imm10_6;
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a_source := a_from_imm10_6;
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_left_unsigned;
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shift_function := shift_left_unsigned;
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when "000010" => --02 SRL r[rd]=u[rt]>>re;
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when "000010" => --SRL r[rd]=u[rt]>>re;
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a_source := a_from_imm10_6;
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a_source := a_from_imm10_6;
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_right_unsigned;
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shift_function := shift_right_unsigned;
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when "000011" => --03 SRA r[rd]=r[rt]>>re;
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when "000011" => --SRA r[rd]=r[rt]>>re;
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a_source := a_from_imm10_6;
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a_source := a_from_imm10_6;
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_right_signed;
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shift_function := shift_right_signed;
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when "000100" => --04 SLLV r[rd]=r[rt]<<r[rs];
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when "000100" => --SLLV r[rd]=r[rt]<<r[rs];
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_left_unsigned;
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shift_function := shift_left_unsigned;
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when "000110" => --06 SRLV r[rd]=u[rt]>>r[rs];
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when "000110" => --SRLV r[rd]=u[rt]>>r[rs];
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_right_unsigned;
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shift_function := shift_right_unsigned;
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when "000111" => --07 SRAV r[rd]=r[rt]>>r[rs];
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when "000111" => --SRAV r[rd]=r[rt]>>r[rs];
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c_source := c_from_shift;
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c_source := c_from_shift;
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shift_function := shift_right_signed;
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shift_function := shift_right_signed;
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when "001000" => --08 JR s->pc_next=r[rs];
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when "001000" => --JR s->pc_next=r[rs];
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pc_source := from_branch;
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pc_source := from_branch;
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alu_function := alu_add;
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alu_function := alu_add;
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branch_function := branch_yes;
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branch_function := branch_yes;
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when "001001" => --09 JALR r[rd]=s->pc_next; s->pc_next=r[rs];
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when "001001" => --JALR r[rd]=s->pc_next; s->pc_next=r[rs];
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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pc_source := from_branch;
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pc_source := from_branch;
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alu_function := alu_add;
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alu_function := alu_add;
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branch_function := branch_yes;
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branch_function := branch_yes;
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when "001010" => --0a MOVZ if(!r[rt]) r[rd]=r[rs]; /*IV*/
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when "001010" => --MOVZ if(!r[rt]) r[rd]=r[rs]; /*IV*/
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-- c_source := c_from_reg_source_eqz;
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-- c_source := c_from_reg_source_eqz;
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when "001011" => --0b MOVN if(r[rt]) r[rd]=r[rs]; /*IV*/
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when "001011" => --MOVN if(r[rt]) r[rd]=r[rs]; /*IV*/
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-- c_source := from_reg_source_nez;
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-- c_source := from_reg_source_nez;
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when "001100" => --0c SYSCALL
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when "001100" => --SYSCALL
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-- if(r[4]==0) printf("0x%8.8lx ",r[5]);
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-- if(r[4]==0) printf("0x%8.8lx ",r[5]);
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when "001101" => --0d BREAK s->wakeup=1;
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when "001101" => --BREAK s->wakeup=1;
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when "001111" => --0f SYNC s->wakeup=1;
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when "001111" => --SYNC s->wakeup=1;
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when "010000" => --10 MFHI r[rd]=s->hi;
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when "010000" => --MFHI r[rd]=s->hi;
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c_source := c_from_mult;
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c_source := c_from_mult;
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mult_function := mult_read_hi;
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mult_function := mult_read_hi;
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when "010001" => --11 FTHI s->hi=r[rs];
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when "010001" => --FTHI s->hi=r[rs];
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mult_function := mult_write_hi;
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mult_function := mult_write_hi;
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when "010010" => --12 MFLO r[rd]=s->lo;
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when "010010" => --MFLO r[rd]=s->lo;
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c_source := c_from_mult;
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c_source := c_from_mult;
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mult_function := mult_read_lo;
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mult_function := mult_read_lo;
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when "010011" => --13 MTLO s->lo=r[rs];
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when "010011" => --MTLO s->lo=r[rs];
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mult_function := mult_write_lo;
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mult_function := mult_write_lo;
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when "011000" => --18 MULT s->lo=r[rs]*r[rt]; s->hi=0;
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when "011000" => --MULT s->lo=r[rs]*r[rt]; s->hi=0;
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mult_function := mult_signed_mult;
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mult_function := mult_signed_mult;
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when "011001" => --19 MULTU s->lo=r[rs]*r[rt]; s->hi=0;
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when "011001" => --MULTU s->lo=r[rs]*r[rt]; s->hi=0;
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mult_function := mult_mult;
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mult_function := mult_mult;
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when "011010" => --1a DIV s->lo=r[rs]/r[rt]; s->hi=r[rs]%r[rt];
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when "011010" => --DIV s->lo=r[rs]/r[rt]; s->hi=r[rs]%r[rt];
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mult_function := mult_signed_divide;
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mult_function := mult_signed_divide;
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when "011011" => --1b DIVU s->lo=r[rs]/r[rt]; s->hi=r[rs]%r[rt];
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when "011011" => --DIVU s->lo=r[rs]/r[rt]; s->hi=r[rs]%r[rt];
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mult_function := mult_divide;
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mult_function := mult_divide;
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when "100000" => --20 ADD r[rd]=r[rs]+r[rt];
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when "100000" => --ADD r[rd]=r[rs]+r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_add;
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alu_function := alu_add;
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when "100001" => --21 ADDU r[rd]=r[rs]+r[rt];
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when "100001" => --ADDU r[rd]=r[rs]+r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_add;
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alu_function := alu_add;
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when "100010" => --22 SUB r[rd]=r[rs]-r[rt];
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when "100010" => --SUB r[rd]=r[rs]-r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_subtract;
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alu_function := alu_subtract;
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when "100011" => --23 SUBU r[rd]=r[rs]-r[rt];
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when "100011" => --SUBU r[rd]=r[rs]-r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_subtract;
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alu_function := alu_subtract;
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when "100100" => --24 AND r[rd]=r[rs]&r[rt];
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when "100100" => --AND r[rd]=r[rs]&r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_and;
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alu_function := alu_and;
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when "100101" => --25 OR r[rd]=r[rs]|r[rt];
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when "100101" => --OR r[rd]=r[rs]|r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_or;
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alu_function := alu_or;
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when "100110" => --26 XOR r[rd]=r[rs]^r[rt];
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when "100110" => --XOR r[rd]=r[rs]^r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_xor;
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alu_function := alu_xor;
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when "100111" => --27 NOR r[rd]=~(r[rs]|r[rt]);
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when "100111" => --NOR r[rd]=~(r[rs]|r[rt]);
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_nor;
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alu_function := alu_nor;
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when "101010" => --2a SLT r[rd]=r[rs]<r[rt];
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when "101010" => --SLT r[rd]=r[rs]<r[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_less_than_signed;
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alu_function := alu_less_than_signed;
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when "101011" => --2b SLTU r[rd]=u[rs]<u[rt];
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when "101011" => --SLTU r[rd]=u[rs]<u[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_less_than;
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alu_function := alu_less_than;
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when "101101" => --2d DADDU r[rd]=r[rs]+u[rt];
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when "101101" => --DADDU r[rd]=r[rs]+u[rt];
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c_source := c_from_alu;
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c_source := c_from_alu;
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alu_function := alu_add;
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alu_function := alu_add;
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when "110001" => --31 TGEU
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when "110001" => --TGEU
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when "110010" => --32 TLT
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when "110010" => --TLT
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when "110011" => --33 TLTU
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when "110011" => --TLTU
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when "110100" => --34 TEQ
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when "110100" => --TEQ
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when "110110" => --36 TNE
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when "110110" => --TNE
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when others =>
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when others =>
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end case;
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end case;
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when "000001" => --00 REGIMM
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when "000001" => --REGIMM
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rt := "000000";
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rt := "000000";
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rd := "011111";
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rd := "011111";
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a_source := a_from_pc;
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a_source := a_from_pc;
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b_source := b_from_immX4;
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b_source := b_from_immX4;
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alu_function := alu_add;
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alu_function := alu_add;
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pc_source := from_branch;
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pc_source := from_branch;
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branch_function := branch_gtz;
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branch_function := branch_gtz;
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--if(test) pc=pc+imm*4
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--if(test) pc=pc+imm*4
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case rtx is
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case rtx is
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when "10000" => --10 BLTZAL r[31]=s->pc_next; branch=r[rs]<0;
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when "10000" => --BLTZAL r[31]=s->pc_next; branch=r[rs]<0;
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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branch_function := branch_ltz;
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branch_function := branch_ltz;
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when "00000" => --00 BLTZ branch=r[rs]<0;
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when "00000" => --BLTZ branch=r[rs]<0;
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branch_function := branch_ltz;
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branch_function := branch_ltz;
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when "10001" => --11 BGEZAL r[31]=s->pc_next; branch=r[rs]>=0;
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when "10001" => --BGEZAL r[31]=s->pc_next; branch=r[rs]>=0;
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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branch_function := branch_gez;
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branch_function := branch_gez;
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when "00001" => --01 BGEZ branch=r[rs]>=0;
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when "00001" => --BGEZ branch=r[rs]>=0;
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branch_function := branch_gez;
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branch_function := branch_gez;
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when "10010" => --12 BLTZALL r[31]=s->pc_next; lbranch=r[rs]<0;
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when "10010" => --BLTZALL r[31]=s->pc_next; lbranch=r[rs]<0;
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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pc_source := from_lbranch;
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pc_source := from_lbranch;
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branch_function := branch_ltz;
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branch_function := branch_ltz;
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when "00010" => --02 BLTZL lbranch=r[rs]<0;
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when "00010" => --BLTZL lbranch=r[rs]<0;
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pc_source := from_lbranch;
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pc_source := from_lbranch;
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branch_function := branch_ltz;
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branch_function := branch_ltz;
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when "10011" => --13 BGEZALL r[31]=s->pc_next; lbranch=r[rs]>=0;
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when "10011" => --BGEZALL r[31]=s->pc_next; lbranch=r[rs]>=0;
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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pc_source := from_lbranch;
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pc_source := from_lbranch;
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branch_function := branch_gez;
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branch_function := branch_gez;
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when "00011" => --03 BGEZL lbranch=r[rs]>=0;
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when "00011" => --BGEZL lbranch=r[rs]>=0;
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pc_source := from_lbranch;
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pc_source := from_lbranch;
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branch_function := branch_gez;
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branch_function := branch_gez;
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when others =>
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when others =>
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end case;
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end case;
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when "000011" => --03 JAL r[31]=s->pc_next; s->pc_next=(s->pc&0xf0000000)|target;
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when "000011" => --JAL r[31]=s->pc_next; s->pc_next=(s->pc&0xf0000000)|target;
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c_source := c_from_pc_plus4;
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c_source := c_from_pc_plus4;
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rd := "011111";
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rd := "011111";
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pc_source := from_opcode25_0;
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pc_source := from_opcode25_0;
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when "000010" => --02 J s->pc_next=(s->pc&0xf0000000)|target;
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when "000010" => --J s->pc_next=(s->pc&0xf0000000)|target;
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pc_source := from_opcode25_0;
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pc_source := from_opcode25_0;
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when "000100" => --04 BEQ branch=r[rs]==r[rt];
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when "000100" => --BEQ branch=r[rs]==r[rt];
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a_source := a_from_pc;
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a_source := a_from_pc;
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b_source := b_from_immX4;
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b_source := b_from_immX4;
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alu_function := alu_add;
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alu_function := alu_add;
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pc_source := from_branch;
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pc_source := from_branch;
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branch_function := branch_eq;
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branch_function := branch_eq;
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when "000101" => --05 BNE branch=r[rs]!=r[rt];
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when "000101" => --BNE branch=r[rs]!=r[rt];
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a_source := a_from_pc;
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a_source := a_from_pc;
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b_source := b_from_immX4;
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b_source := b_from_immX4;
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alu_function := alu_add;
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alu_function := alu_add;
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pc_source := from_branch;
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pc_source := from_branch;
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branch_function := branch_ne;
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branch_function := branch_ne;
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when "000110" => --06 BLEZ branch=r[rs]<=0;
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when "000110" => --BLEZ branch=r[rs]<=0;
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a_source := a_from_pc;
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a_source := a_from_pc;
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b_source := b_from_immX4;
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b_source := b_from_immX4;
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alu_function := alu_add;
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alu_function := alu_add;
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pc_source := from_branch;
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pc_source := from_branch;
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branch_function := branch_lez;
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branch_function := branch_lez;
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when "000111" => --07 BGTZ branch=r[rs]>0;
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when "000111" => --BGTZ branch=r[rs]>0;
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a_source := a_from_pc;
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a_source := a_from_pc;
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b_source := b_from_immX4;
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b_source := b_from_immX4;
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alu_function := alu_add;
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alu_function := alu_add;
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pc_source := from_branch;
|
pc_source := from_branch;
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branch_function := branch_gtz;
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branch_function := branch_gtz;
|
when "001000" => --08 ADDI r[rt]=r[rs]+(short)imm;
|
when "001000" => --ADDI r[rt]=r[rs]+(short)imm;
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b_source := b_from_signed_imm;
|
b_source := b_from_signed_imm;
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c_source := c_from_alu;
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c_source := c_from_alu;
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rd := rt;
|
rd := rt;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
when "001001" => --09 ADDIU u[rt]=u[rs]+(short)imm;
|
when "001001" => --ADDIU u[rt]=u[rs]+(short)imm;
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b_source := b_from_signed_imm;
|
b_source := b_from_signed_imm;
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c_source := c_from_alu;
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c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_add;
|
alu_function := alu_add;
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when "001010" => --0a SLTI r[rt]=r[rs]<(short)imm;
|
when "001010" => --SLTI r[rt]=r[rs]<(short)imm;
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b_source := b_from_signed_imm;
|
b_source := b_from_signed_imm;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_less_than;
|
alu_function := alu_less_than;
|
when "001011" => --0b SLTIU u[rt]=u[rs]<(unsigned long)(short)imm;
|
when "001011" => --SLTIU u[rt]=u[rs]<(unsigned long)(short)imm;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_less_than;
|
alu_function := alu_less_than;
|
when "001100" => --0c ANDI r[rt]=r[rs]&imm;
|
when "001100" => --ANDI r[rt]=r[rs]&imm;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_and;
|
alu_function := alu_and;
|
when "001101" => --0d ORI r[rt]=r[rs]|imm;
|
when "001101" => --ORI r[rt]=r[rs]|imm;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_or;
|
alu_function := alu_or;
|
when "001110" => --0e XORI r[rt]=r[rs]^imm;
|
when "001110" => --XORI r[rt]=r[rs]^imm;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
rd := rt;
|
rd := rt;
|
alu_function := alu_xor;
|
alu_function := alu_xor;
|
when "001111" => --0f LUI r[rt]=(imm<<16);
|
when "001111" => --LUI r[rt]=(imm<<16);
|
c_source := c_from_imm_shift16;
|
c_source := c_from_imm_shift16;
|
rd := rt;
|
rd := rt;
|
when "010000" => --10 COP0
|
when "010000" => --COP0
|
alu_function := alu_or;
|
alu_function := alu_or;
|
c_source := c_from_alu;
|
c_source := c_from_alu;
|
if opcode(23) = '0' then --move from CP0
|
if opcode(23) = '0' then --move from CP0
|
rs := '1' & opcode(15 downto 11);
|
rs := '1' & opcode(15 downto 11);
|
rt := "000000";
|
rt := "000000";
|
rd := '0' & opcode(20 downto 16);
|
rd := '0' & opcode(20 downto 16);
|
else --move to CP0
|
else --move to CP0
|
rs := "000000";
|
rs := "000000";
|
rd(5) := '1';
|
rd(5) := '1';
|
end if;
|
end if;
|
when "010001" => --11 COP1
|
when "010001" => --COP1
|
when "010010" => --12 COP2
|
when "010010" => --COP2
|
when "010011" => --13 COP3
|
when "010011" => --COP3
|
when "010100" => --14 BEQL lbranch=r[rs]==r[rt];
|
when "010100" => --BEQL lbranch=r[rs]==r[rt];
|
a_source := a_from_pc;
|
a_source := a_from_pc;
|
b_source := b_from_immX4;
|
b_source := b_from_immX4;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
pc_source := from_lbranch;
|
pc_source := from_lbranch;
|
branch_function := branch_eq;
|
branch_function := branch_eq;
|
when "010101" => --15 BNEL lbranch=r[rs]!=r[rt];
|
when "010101" => --BNEL lbranch=r[rs]!=r[rt];
|
a_source := a_from_pc;
|
a_source := a_from_pc;
|
b_source := b_from_immX4;
|
b_source := b_from_immX4;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
pc_source := from_lbranch;
|
pc_source := from_lbranch;
|
branch_function := branch_ne;
|
branch_function := branch_ne;
|
when "010110" => --16 BLEZL lbranch=r[rs]<=0;
|
when "010110" => --BLEZL lbranch=r[rs]<=0;
|
a_source := a_from_pc;
|
a_source := a_from_pc;
|
b_source := b_from_immX4;
|
b_source := b_from_immX4;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
pc_source := from_lbranch;
|
pc_source := from_lbranch;
|
branch_function := branch_lez;
|
branch_function := branch_lez;
|
when "010111" => --17 BGTZL lbranch=r[rs]>0;
|
when "010111" => --BGTZL lbranch=r[rs]>0;
|
a_source := a_from_pc;
|
a_source := a_from_pc;
|
b_source := b_from_immX4;
|
b_source := b_from_immX4;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
pc_source := from_lbranch;
|
pc_source := from_lbranch;
|
branch_function := branch_gtz;
|
branch_function := branch_gtz;
|
when "100000" => --20 LB r[rt]=*(signed char*)ptr;
|
when "100000" => --LB r[rt]=*(signed char*)ptr;
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read8s; --address=(short)imm+r[rs];
|
mem_source := mem_read8s; --address=(short)imm+r[rs];
|
when "100001" => --21 LH r[rt]=*(signed short*)ptr;
|
when "100001" => --LH r[rt]=*(signed short*)ptr;
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read16s; --address=(short)imm+r[rs];
|
mem_source := mem_read16s; --address=(short)imm+r[rs];
|
when "100010" => --22 LWL //Not Implemented
|
when "100010" => --LWL //Not Implemented
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read32;
|
mem_source := mem_read32;
|
when "100011" => --23 LW r[rt]=*(long*)ptr;
|
when "100011" => --LW r[rt]=*(long*)ptr;
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read32;
|
mem_source := mem_read32;
|
when "100100" => --24 LBU r[rt]=*(unsigned char*)ptr;
|
when "100100" => --LBU r[rt]=*(unsigned char*)ptr;
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read8; --address=(short)imm+r[rs];
|
mem_source := mem_read8; --address=(short)imm+r[rs];
|
when "100101" => --25 LHU r[rt]=*(unsigned short*)ptr;
|
when "100101" => --LHU r[rt]=*(unsigned short*)ptr;
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
rd := rt;
|
rd := rt;
|
c_source := c_from_memory;
|
c_source := c_from_memory;
|
mem_source := mem_read16; --address=(short)imm+r[rs];
|
mem_source := mem_read16; --address=(short)imm+r[rs];
|
when "100110" => --26 LWR //Not Implemented
|
when "100110" => --LWR //Not Implemented
|
when "101000" => --28 SB *(char*)ptr=(char)r[rt];
|
when "101000" => --SB *(char*)ptr=(char)r[rt];
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
mem_source := mem_write8; --address=(short)imm+r[rs];
|
mem_source := mem_write8; --address=(short)imm+r[rs];
|
when "101001" => --29 SH *(short*)ptr=(short)r[rt];
|
when "101001" => --SH *(short*)ptr=(short)r[rt];
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
mem_source := mem_write16;
|
mem_source := mem_write16;
|
when "101010" => --2a SWL //Not Implemented
|
when "101010" => --SWL //Not Implemented
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
mem_source := mem_write32; --address=(short)imm+r[rs];
|
mem_source := mem_write32; --address=(short)imm+r[rs];
|
when "101011" => --2b SW *(long*)ptr=r[rt];
|
when "101011" => --SW *(long*)ptr=r[rt];
|
a_source := a_from_reg_source;
|
a_source := a_from_reg_source;
|
b_source := b_from_imm;
|
b_source := b_from_imm;
|
alu_function := alu_add;
|
alu_function := alu_add;
|
mem_source := mem_write32; --address=(short)imm+r[rs];
|
mem_source := mem_write32; --address=(short)imm+r[rs];
|
when "101110" => --2e SWR //Not Implemented
|
when "101110" => --SWR //Not Implemented
|
when "101111" => --2f CACHE
|
when "101111" => --CACHE
|
when "110000" => --30 LL r[rt]=*(long*)ptr;
|
when "110000" => --LL r[rt]=*(long*)ptr;
|
when "110001" => --31 LWC1
|
when "110001" => --LWC1
|
when "110010" => --32 LWC2
|
when "110010" => --LWC2
|
when "110011" => --33 LWC3
|
when "110011" => --LWC3
|
when "110101" => --35 LDC1
|
when "110101" => --LDC1
|
when "110110" => --36 LDC2
|
when "110110" => --LDC2
|
when "110111" => --37 LDC3
|
when "110111" => --LDC3
|
when "111000" => --38 SC *(long*)ptr=r[rt]; r[rt]=1;
|
when "111000" => --SC *(long*)ptr=r[rt]; r[rt]=1;
|
when "111001" => --39 SWC1
|
when "111001" => --SWC1
|
when "111010" => --3a SWC2
|
when "111010" => --SWC2
|
when "111011" => --3b SWC3
|
when "111011" => --SWC3
|
when "111101" => --3d SDC1
|
when "111101" => --SDC1
|
when "111110" => --3e SDC2
|
when "111110" => --SDC2
|
when "111111" => --3f SDC3
|
when "111111" => --SDC3
|
when others =>
|
when others =>
|
end case;
|
end case;
|
|
|
if c_source = c_from_null or pause_in = '1' then
|
if c_source = c_from_null or pause_in = '1' then
|
rd := "000000";
|
rd := "000000";
|
