📄 control_fsm_rtl.vhd
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--------------------------------------------------------------------- when IC_CPL_A => -- CPL A alu_cmd_o <= INV_ACC; -- complement operation s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_CPL_C => -- CPL C s_adr_mux <= "1011"; -- adress of CY s_bdata_mux <= "0101"; -- bdata = not cy s_regs_wr_en <= "110"; -- write one bit s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_CPL_BIT => -- CPL bit if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1000"; -- bit adress s_nextstate <= EXEC2; elsif state=EXEC2 then s_adr_mux <= "1000"; -- bit adress s_bdata_mux <= "0110"; -- bdata = not s_bit_data s_regs_wr_en <= "110"; -- write one bit s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; else s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DA_A => -- DA A alu_cmd_o <= DA; -- DA operation s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "111"; -- write ACC and CY (special operation) s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_DEC_A => -- DEC A alu_cmd_o <= DEC_ACC; -- decrement operation s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_DEC_RR => -- DEC Rr if state=FETCH then s_adr_mux <= "0110"; -- address = rr-address s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= DEC_RAM; -- decrement operation s_adr_mux <= "0110"; -- address = rr-address s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DEC_D => -- DEC direct if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1000"; -- address = rom_data_i s_nextstate <= EXEC2; elsif state=EXEC2 then s_adr_mux <= "1000"; -- address = rom_data_i s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte alu_cmd_o <= DEC_RAM; -- decrement operation s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DEC_ATRI => -- DEC @Ri if state=FETCH then s_adr_mux <= "0111"; -- address = Ri-register s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= DEC_RAM; -- decrement operation s_adr_mux <= "0111"; -- address = ri-address s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DIV_AB => -- DIV AB if state=FETCH then s_adr_mux <= "1100"; -- adress of B register alu_cmd_o <= DIV_ACC_RAM; -- divison operation s_nextstate <= EXEC1; elsif state=EXEC1 then s_data_mux <= "0011"; -- data = aludata_i s_adr_mux <= "1100"; -- adress of B register alu_cmd_o <= DIV_ACC_RAM; -- divison operation s_nextstate <= EXEC2; elsif state=EXEC2 then s_data_mux <= "0011"; -- data = aludata_i s_adr_mux <= "1100"; -- adress of B register s_regs_wr_en <= "111"; -- write ACC,B,OV,CY(special operation) alu_cmd_o <= DIV_ACC_RAM; -- divison operation s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DJNZ_RR => -- DJNZ Rr, rel if state=FETCH then s_adr_mux <= "0110"; -- address = rr-address s_help_en <= "0100"; -- save Rr-adress s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= DEC_RAM; -- decrement operation if unsigned(aludata_i) /= 0 then s_adr_mux <= "1010"; -- address = rr-address s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_adr_mux <= "1010"; -- address = rr-address s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_DJNZ_D => -- DJNZ direct, rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_help_en <= "0001"; -- save address s_adr_mux <= "1000"; -- address = rom_data s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC2; elsif state=EXEC2 then alu_cmd_o <= DEC_RAM; -- decrement operation if unsigned(aludata_i) /= 0 then s_adr_mux <= "1010"; -- address = help s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_adr_mux <= "1010"; -- address = help s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_INC_A => -- INC A alu_cmd_o <= INC_ACC; -- increment operation s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_INC_RR => -- INC Rr if state=FETCH then s_adr_mux <= "0110"; -- address = rr-address s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= INC_RAM; -- increment operation s_adr_mux <= "0110"; -- address = rr-address s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_INC_D => -- INC direct if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1000"; -- address = rom_data_i s_nextstate <= EXEC2; elsif state=EXEC2 then alu_cmd_o <= INC_RAM; -- increment operation s_adr_mux <= "1000"; -- address = rom_data_i s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_INC_ATRI => -- INC @Ri if state=FETCH then s_adr_mux <= "0111"; -- address = Ri-register s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= INC_RAM; -- increment operation s_adr_mux <= "0111"; -- address = Ri-register s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_INC_DPTR => -- INC DPTR if state=FETCH then s_adr_mux <= "1101"; -- adress of DPL s_nextstate <= EXEC1; elsif state=EXEC1 then alu_cmd_o <= INC_RAM; -- increment operation s_help_en <= "0010"; -- help = aludata_i s_adr_mux <= "1101"; -- adress of DPL s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte s_nextstate <= EXEC2; elsif state=EXEC2 then s_adr_mux <= "1110"; -- adress of DPH s_nextstate <= EXEC3; elsif state=EXEC3 then if s_help=conv_unsigned(0,8) then alu_cmd_o <= INC_RAM; -- increment operation s_adr_mux <= "1110"; -- adress of DPH s_data_mux <= "0011"; -- data = aludata_i s_regs_wr_en <= "100"; -- write one byte else end if; s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JB => -- JB bit, rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1000"; -- bit adress = rom_data_i s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC2; elsif state=EXEC2 then if s_bit_data = '1' then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter⌨️ 快捷键说明
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