📄 control_fsm_rtl.vhd
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end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JBC => -- JBC 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_help_en <= "0001"; -- s_help = rom_data_i s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC2; elsif state=EXEC2 then s_adr_mux <= "1010"; -- s_adr = s_help s_bdata_mux <= "0000"; -- s_bdata = 0 s_regs_wr_en <= "110"; -- write one bit 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 end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JC => -- JC rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then if cy = '1' then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JMP_A_DPTR => -- JMP @A+DPTR s_pc_inc_en <= "0101"; -- PC = ACC + DPTR s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_JNB => -- JNB 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 = '0' then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JNC => -- JNC rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then if cy = '0' then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JNZ => -- JNZ rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then if unsigned(acc) /= conv_unsigned(0,8) then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_JZ => -- JZ rel if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then if unsigned(acc) = conv_unsigned(0,8) then s_pc_inc_en <= "0010"; -- add relativ adress to PC else s_pc_inc_en <= "0001"; -- increment program-counter end if; s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_LCALL => -- LCALL addr16 if state=FETCH then s_regs_wr_en <= "001"; -- increment stackpointer s_help16_en <= "01"; -- s_help16 <= pc + 3 s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_help_en <= "0001"; -- help <= rom_data_i s_data_mux <= "1100"; -- data <= help16(7 downto 0) s_adr_mux <= "0101"; -- s_adr <= sp s_regs_wr_en <= "101"; -- write one byte and increment SP s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC2; elsif state=EXEC2 then s_data_mux <= "1101"; -- data = help16(15 downto 8) s_adr_mux <= "0101"; -- s_adr <= sp s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0111"; -- load program counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_LJMP => -- LJMP addr16 if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_help_en <= "0001"; -- help = rom_data_i s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC2; elsif state=EXEC2 then s_pc_inc_en <= "0111"; -- load program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_A_RR => -- MOV A,Rr if state=FETCH then s_adr_mux <= "0110"; -- address = rr-address s_nextstate <= EXEC1; elsif state=EXEC1 then s_data_mux <= "0100"; -- data = s_reg_data s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_A_D => -- MOV A, 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_data_mux <= "0100"; -- data = s_reg_data s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_A_ATRI => -- MOV A,@Ri if state=FETCH then s_adr_mux <= "0111"; -- address = Ri-register s_nextstate <= EXEC1; elsif state=EXEC1 then s_data_mux <= "0100"; -- data = s_reg_data s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_A_DATA => -- MOV A, #DATA if state=FETCH then s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_data_mux <= "0101"; -- data = rom_data_i s_regs_wr_en <= "010"; -- write ACC s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_RR_A => -- MOV Rr,A s_adr_mux <= "0110"; -- address = rr-address s_data_mux <= "0110"; -- data = ACC s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; --------------------------------------------------------------------- when IC_MOV_RR_D => -- MOV Rr, direct if state=FETCH then s_help_en <= "0100"; -- save Rr-adress in help 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 <= "1010"; -- address = help s_data_mux <= "0100"; -- data = s_reg_data s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- do nothing with program counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_RR_DATA => -- MOV Rr,#data if state=FETCH then s_help_en <= "0100"; -- save Rr-adress in help s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1010"; -- address = help s_data_mux <= "0101"; -- data = rom_data_i s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- do nothing with program counter s_nextstate <= FETCH; end if; --------------------------------------------------------------------- when IC_MOV_D_A => -- MOV direct, A 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_data_mux <= "0110"; -- data = ACC s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= FETCH; end if; ------------------------------------------------------------------- when IC_MOV_D_RR => -- MOV direct, Rr if state=FETCH then s_adr_mux <= "0110"; -- address = rr-address s_pc_inc_en <= "0001"; -- increment program-counter s_nextstate <= EXEC1; elsif state=EXEC1 then s_adr_mux <= "1000"; -- address = rom_data_i s_data_mux <= "0100"; -- data = s_reg_data s_regs_wr_en <= "100"; -- write one byte s_pc_inc_en <= "0001"; -- do nothing with program counter s_nextstate <= FETCH; end if; --------------------------------------------------------------⌨️ 快捷键说明
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