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[/] [avr_hp/] [trunk/] [rtl/] [rtl_orig/] [pm_fetch_dec.vhd] - Rev 2
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--************************************************************************************************ -- PM_FETCH_DEC(internal module) for AVR core -- Version 2.6! (Special version for the JTAG OCD) -- Designed by Ruslan Lepetenok 14.11.2001 -- Modified 31.05.06 -- Modification: -- Registered ramre/ramwe outputs -- cpu_busy logic modified(affects RCALL/ICALL/CALL instruction interract with interrupt) -- SLEEP and CLRWDT instructions support was added -- V-flag bug fixed (AND/ANDI/OR/ORI/EOR) -- V-flag bug fixed (ADIW/SBIW) -- Unused outputs(sreg_bit_num[2..0],idc_sbi_out,idc_cbi_out,idc_bld_out) were removed. -- Output alu_data_d_in[7..0] was removed. -- Gloabal clock enable(cp2en) was added -- cpu_busy(push/pop) + irq bug was fixed 14.07.05 -- BRXX+IRQ interaction was modified -> cpu_busy -- LDS/STS now requires only two cycles for execution (13.01.06 -> last modificatioon) --************************************************************************************************ library IEEE; use IEEE.std_logic_1164.all; use IEEE.std_logic_unsigned.all; use WORK.AVRuCPackage.all; entity pm_fetch_dec is port( -- Clock and reset cp2 : in std_logic; cp2en : in std_logic; ireset : in std_logic; -- JTAG OCD support valid_instr : out std_logic; insert_nop : in std_logic; block_irq : in std_logic; change_flow : out std_logic; -- Program memory pc : out std_logic_vector (15 downto 0); inst : in std_logic_vector (15 downto 0); -- I/O control adr : out std_logic_vector (5 downto 0); iore : out std_logic; iowe : out std_logic; -- Data memory control ramadr : out std_logic_vector (15 downto 0); ramre : out std_logic; ramwe : out std_logic; cpuwait : in std_logic; -- Data paths dbusin : in std_logic_vector (7 downto 0); dbusout : out std_logic_vector (7 downto 0); dbusout_int_route : out std_logic_vector (7 downto 0); -- Interrupt irqlines : in std_logic_vector (22 downto 0); irqack : out std_logic; irqackad : out std_logic_vector(4 downto 0); --Sleep sleepi : out std_logic; irqok : out std_logic; --Watchdog wdri : out std_logic; -- ALU interface(Data inputs) alu_data_r_in : out std_logic_vector(7 downto 0); -- ALU interface(Instruction inputs) idc_add_out : out std_logic; idc_adc_out : out std_logic; idc_adiw_out : out std_logic; idc_sub_out : out std_logic; idc_subi_out : out std_logic; idc_sbc_out : out std_logic; idc_sbci_out : out std_logic; idc_sbiw_out : out std_logic; adiw_st_out : out std_logic; sbiw_st_out : out std_logic; idc_and_out : out std_logic; idc_andi_out : out std_logic; idc_or_out : out std_logic; idc_ori_out : out std_logic; idc_eor_out : out std_logic; idc_com_out : out std_logic; idc_neg_out : out std_logic; idc_inc_out : out std_logic; idc_dec_out : out std_logic; idc_cp_out : out std_logic; idc_cpc_out : out std_logic; idc_cpi_out : out std_logic; idc_cpse_out : out std_logic; idc_lsr_out : out std_logic; idc_ror_out : out std_logic; idc_asr_out : out std_logic; idc_swap_out : out std_logic; -- ALU interface(Data output) alu_data_out : in std_logic_vector(7 downto 0); -- ALU interface(Flag outputs) alu_c_flag_out : in std_logic; alu_z_flag_out : in std_logic; alu_n_flag_out : in std_logic; alu_v_flag_out : in std_logic; alu_s_flag_out : in std_logic; alu_h_flag_out : in std_logic; -- General purpose register file interface reg_rd_in : out std_logic_vector (7 downto 0); reg_rd_out : in std_logic_vector (7 downto 0); reg_rd_out_int : in std_logic_vector(7 downto 0); reg_rd_adr : out std_logic_vector (4 downto 0); reg_rd_adr_int : out std_logic_vector (4 downto 0); reg_rr_out : in std_logic_vector (7 downto 0); reg_rr_adr : out std_logic_vector (4 downto 0); reg_rd_wr : out std_logic; post_inc : out std_logic; -- POST INCREMENT FOR LD/ST INSTRUCTIONS pre_dec : out std_logic; -- PRE DECREMENT FOR LD/ST INSTRUCTIONS reg_h_wr : out std_logic; reg_h_out : in std_logic_vector (15 downto 0); reg_h_adr : out std_logic_vector (2 downto 0); -- x,y,z reg_z_out : in std_logic_vector (15 downto 0); -- OUTPUT OF R31:R30 FOR LPM/ELPM/IJMP INSTRUCTIONS -- I/O register file interface sreg_fl_in : out std_logic_vector(7 downto 0); globint : in std_logic; -- SREG I flag sreg_fl_wr_en : out std_logic_vector(7 downto 0); --FLAGS WRITE ENABLE SIGNALS spl_out : in std_logic_vector(7 downto 0); sph_out : in std_logic_vector(7 downto 0); sp_ndown_up : out std_logic; -- DIRECTION OF CHANGING OF STACK POINTER SPH:SPL 0->UP(+) 1->DOWN(-) sp_en : out std_logic; -- WRITE ENABLE(COUNT ENABLE) FOR SPH AND SPL REGISTERS rampz_out : in std_logic_vector(7 downto 0); -- Bit processor interface bit_num_r_io : out std_logic_vector (2 downto 0); -- BIT NUMBER FOR CBI/SBI/BLD/BST/SBRS/SBRC/SBIC/SBIS INSTRUCTIONS bitpr_io_out : in std_logic_vector(7 downto 0); -- SBI/CBI OUT branch : out std_logic_vector (2 downto 0); -- NUMBER (0..7) OF BRANCH CONDITION FOR BRBS/BRBC INSTRUCTION bit_pr_sreg_out : in std_logic_vector(7 downto 0); -- BCLR/BSET/BST(T-FLAG ONLY) bld_op_out : in std_logic_vector(7 downto 0); -- BLD OUT (T FLAG) bit_test_op_out : in std_logic; -- OUTPUT OF SBIC/SBIS/SBRS/SBRC sbi_st_out : out std_logic; cbi_st_out : out std_logic; idc_bst_out : out std_logic; idc_bset_out : out std_logic; idc_bclr_out : out std_logic; idc_sbic_out : out std_logic; idc_sbis_out : out std_logic; idc_sbrs_out : out std_logic; idc_sbrc_out : out std_logic; idc_brbs_out : out std_logic; idc_brbc_out : out std_logic; idc_reti_out : out std_logic); end pm_fetch_dec; architecture RTL of pm_fetch_dec is -- COPIES OF OUTPUTS signal ramadr_reg_in : std_logic_vector(15 downto 0); -- INPUT OF THE ADDRESS REGISTER signal ramadr_reg_en : std_logic; -- ADRESS REGISTER CLOCK ENABLE SIGNAL signal irqack_int : std_logic; signal irqackad_int : std_logic_vector(irqackad'range); -- #################################################### -- INTERNAL SIGNALS -- #################################################### -- NEW SIGNALS signal two_word_inst : std_logic; -- CALL/JMP/STS/LDS INSTRUCTION INDICATOR signal ram_adr_int : std_logic_vector (15 downto 0); constant const_ram_to_reg : std_logic_vector := "00000000000"; -- LD/LDS/LDD/ST/STS/STD ADDRESSING GENERAL PURPOSE REGISTER (R0-R31) 0x00..0x19 constant const_ram_to_io_a : std_logic_vector := "00000000001"; -- LD/LDS/LDD/ST/STS/STD ADDRESSING GENERAL I/O PORT 0x20 0x3F constant const_ram_to_io_b : std_logic_vector := "00000000010"; -- LD/LDS/LDD/ST/STS/STD ADDRESSING GENERAL I/O PORT 0x20 0x3F -- LD/LDD/ST/STD SIGNALS signal adiw_sbiw_encoder_out : std_logic_vector (4 downto 0); signal adiw_sbiw_encoder_mux_out : std_logic_vector (4 downto 0); -- PROGRAM COUNTER SIGNALS signal program_counter_tmp : std_logic_vector (15 downto 0); -- TO STORE PC DURING LPM/ELPM INSTRUCTIONS signal program_counter : std_logic_vector (15 downto 0); signal program_counter_in : std_logic_vector (15 downto 0); signal program_counter_high_fr : std_logic_vector (7 downto 0); -- TO STORE PC FOR CALL,IRQ,RCALL,ICALL signal pc_low : std_logic_vector (7 downto 0); signal pc_high : std_logic_vector (7 downto 0); signal pc_low_en : std_logic; signal pc_high_en : std_logic; signal offset_brbx : std_logic_vector (15 downto 0); -- OFFSET FOR BRCS/BRCC INSTRUCTION !!CHECKED signal offset_rxx : std_logic_vector (15 downto 0); -- OFFSET FOR RJMP/RCALL INSTRUCTION !!CHECKED signal pa15_pm : std_logic; -- ADDRESS LINE 15 FOR LPM/ELPM INSTRUCTIONS ('0' FOR LPM,RAMPZ(0) FOR ELPM) signal alu_reg_wr : std_logic; -- ALU INSTRUCTIONS PRODUCING WRITE TO THE GENERAL PURPOSE REGISTER FILE -- DATA MEMORY,GENERAL PURPOSE REGISTERS AND I/O REGISTERS LOGIC --! IMPORTANT NOTICE : OPERATIONS WHICH USE STACK POINTER (SPH:SPL) CAN NOT ACCCSESS GENERAL -- PURPOSE REGISTER FILE AND INPUT/OUTPUT REGISTER FILE ! -- THESE OPERATIONS ARE : RCALL/ICALL/CALL/RET/RETI/PUSH/POP INSTRUCTIONS AND INTERRUPT signal reg_file_adr_space : std_logic; -- ACCSESS TO THE REGISTER FILE signal io_file_adr_space : std_logic; -- ACCSESS TO THE I/O FILE -- STATE MACHINES SIGNALS signal irq_start : std_logic; signal nirq_st0 : std_logic; signal irq_st1 : std_logic; signal irq_st2 : std_logic; signal irq_st3 : std_logic; signal ncall_st0 : std_logic; signal call_st1 : std_logic; signal call_st2 : std_logic; signal call_st3 : std_logic; signal nrcall_st0 : std_logic; signal rcall_st1 : std_logic; signal rcall_st2 : std_logic; signal nicall_st0 : std_logic; signal icall_st1 : std_logic; signal icall_st2 : std_logic; signal njmp_st0 : std_logic; signal jmp_st1 : std_logic; signal jmp_st2 : std_logic; signal ijmp_st : std_logic; signal rjmp_st : std_logic; signal nret_st0 : std_logic; signal ret_st1 : std_logic; signal ret_st2 : std_logic; signal ret_st3 : std_logic; signal nreti_st0 : std_logic; signal reti_st1 : std_logic; signal reti_st2 : std_logic; signal reti_st3 : std_logic; signal brxx_st : std_logic; -- BRANCHES signal adiw_st : std_logic; signal sbiw_st : std_logic; signal nskip_inst_st0 : std_logic; signal skip_inst_st1 : std_logic; signal skip_inst_st2 : std_logic; -- ALL SKIP INSTRUCTIONS SBRS/SBRC/SBIS/SBIC/CPSE signal skip_inst_start : std_logic; signal nlpm_st0 : std_logic; signal lpm_st1 : std_logic; signal lpm_st2 : std_logic; signal nelpm_st0 : std_logic; signal elpm_st1 : std_logic; signal elpm_st2 : std_logic; --signal nsts_st0 : std_logic; --signal sts_st1 : std_logic; --signal sts_st2 : std_logic; signal sts_st : std_logic; --signal nlds_st0 : std_logic; --signal lds_st1 : std_logic; --signal lds_st2 : std_logic; signal lds_st : std_logic; signal st_st : std_logic; signal ld_st : std_logic; signal sbi_st : std_logic; signal cbi_st : std_logic; signal push_st : std_logic; signal pop_st : std_logic; -- INTERNAL STATE MACHINES signal nop_insert_st : std_logic; signal cpu_busy : std_logic; -- INTERNAL COPIES OF OUTPUTS signal pc_int : std_logic_vector (15 downto 0); signal adr_int : std_logic_vector (5 downto 0); signal iore_int : std_logic; signal iowe_int : std_logic; signal ramadr_int : std_logic_vector (15 downto 0); signal ramre_int : std_logic; signal ramwe_int : std_logic; signal dbusout_int : std_logic_vector (7 downto 0); -- COMMAND REGISTER signal instruction_reg : std_logic_vector (15 downto 0); -- OUTPUT OF THE INSTRUCTION REGISTER signal instruction_code_reg : std_logic_vector (15 downto 0); -- OUTPUT OF THE INSTRUCTION REGISTER WITH NOP INSERTION signal instruction_reg_ena : std_logic; -- CLOCK ENABLE -- IRQ INTERNAL LOGIC signal irq_int : std_logic; signal irq_vector_adr : std_logic_vector(15 downto 0); -- INTERRUPT RELATING REGISTERS signal pc_for_interrupt : std_logic_vector(15 downto 0); -- DATA EXTRACTOR SIGNALS signal dex_dat8_immed : std_logic_vector (7 downto 0); -- IMMEDIATE CONSTANT (DATA) -> ANDI,ORI,SUBI,SBCI,CPI,LDI signal dex_dat6_immed : std_logic_vector (5 downto 0); -- IMMEDIATE CONSTANT (DATA) -> ADIW,SBIW signal dex_adr12mem_s : std_logic_vector (11 downto 0); -- RELATIVE ADDRESS (SIGNED) -> RCALL,RJMP signal dex_adr6port : std_logic_vector (5 downto 0); -- I/O PORT ADDRESS -> IN,OUT signal dex_adr5port : std_logic_vector (4 downto 0); -- I/O PORT ADDRESS -> CBI,SBI,SBIC,SBIS signal dex_adr_disp : std_logic_vector (5 downto 0); -- DISPLACEMENT FO ADDDRESS -> STD,LDD signal dex_condition : std_logic_vector (2 downto 0); -- CONDITION -> BRBC,BRBS signal dex_bitnum_sreg : std_logic_vector (2 downto 0); -- NUMBER OF BIT IN SREG -> BCLR,BSET signal dex_adrreg_r : std_logic_vector (4 downto 0); -- SOURCE REGISTER ADDRESS -> ....... signal dex_adrreg_d : std_logic_vector (4 downto 0); -- DESTINATION REGISTER ADDRESS -> ...... signal dex_bitop_bitnum : std_logic_vector(2 downto 0); -- NUMBER OF BIT FOR BIT ORIENTEDE OPERATION -> BST/BLD+SBI/CBI+SBIC/SBIS+SBRC/SBRS !! CHECKED signal dex_brxx_offset : std_logic_vector (6 downto 0); -- RELATIVE ADDRESS (SIGNED) -> BRBC,BRBS !! CHECKED signal dex_adiw_sbiw_reg_adr : std_logic_vector (1 downto 0); -- ADDRESS OF THE LOW REGISTER FOR ADIW/SBIW INSTRUCTIONS signal dex_adrreg_d_latched : std_logic_vector (4 downto 0); -- STORE ADDRESS OF DESTINATION REGISTER FOR LDS/STS/POP INSTRUCTIONS signal gp_reg_tmp : std_logic_vector (7 downto 0); -- STORE DATA FROM THE REGISTERS FOR STS,ST INSTRUCTIONS signal cbi_sbi_io_adr_tmp : std_logic_vector (4 downto 0); -- STORE ADDRESS OF I/O PORT FOR CBI/SBI INSTRUCTION signal cbi_sbi_bit_num_tmp : std_logic_vector (2 downto 0); -- STORE ADDRESS OF I/O PORT FOR CBI/SBI INSTRUCTION -- INSTRUCTIONS DECODER SIGNALS signal idc_adc : std_logic; -- INSTRUCTION ADC signal idc_add : std_logic; -- INSTRUCTION ADD signal idc_adiw : std_logic; -- INSTRUCTION ADIW signal idc_and : std_logic; -- INSTRUCTION AND signal idc_andi : std_logic; -- INSTRUCTION ANDI signal idc_asr : std_logic; -- INSTRUCTION ASR signal idc_bclr : std_logic; -- INSTRUCTION BCLR signal idc_bld : std_logic; -- INSTRUCTION BLD signal idc_brbc : std_logic; -- INSTRUCTION BRBC signal idc_brbs : std_logic; -- INSTRUCTION BRBS signal idc_bset : std_logic; -- INSTRUCTION BSET signal idc_bst : std_logic; -- INSTRUCTION BST signal idc_call : std_logic; -- INSTRUCTION CALL signal idc_cbi : std_logic; -- INSTRUCTION CBI signal idc_com : std_logic; -- INSTRUCTION COM signal idc_cp : std_logic; -- INSTRUCTION CP signal idc_cpc : std_logic; -- INSTRUCTION CPC signal idc_cpi : std_logic; -- INSTRUCTION CPI signal idc_cpse : std_logic; -- INSTRUCTION CPSE signal idc_dec : std_logic; -- INSTRUCTION DEC signal idc_elpm : std_logic; -- INSTRUCTION ELPM signal idc_eor : std_logic; -- INSTRUCTION EOR signal idc_icall : std_logic; -- INSTRUCTION ICALL signal idc_ijmp : std_logic; -- INSTRUCTION IJMP signal idc_in : std_logic; -- INSTRUCTION IN signal idc_inc : std_logic; -- INSTRUCTION INC signal idc_jmp : std_logic; -- INSTRUCTION JMP signal idc_ld_x : std_logic; -- INSTRUCTION LD Rx,X ; LD Rx,X+ ;LD Rx,-X signal idc_ld_y : std_logic; -- INSTRUCTION LD Rx,Y ; LD Rx,Y+ ;LD Rx,-Y signal idc_ldd_y : std_logic; -- INSTRUCTION LDD Rx,Y+q signal idc_ld_z : std_logic; -- INSTRUCTION LD Rx,Z ; LD Rx,Z+ ;LD Rx,-Z signal idc_ldd_z : std_logic; -- INSTRUCTION LDD Rx,Z+q signal idc_ldi : std_logic; -- INSTRUCTION LDI signal idc_lds : std_logic; -- INSTRUCTION LDS signal idc_lpm : std_logic; -- INSTRUCTION LPM signal idc_lsr : std_logic; -- INSTRUCTION LSR signal idc_mov : std_logic; -- INSTRUCTION MOV signal idc_mul : std_logic; -- INSTRUCTION MUL signal idc_neg : std_logic; -- INSTRUCTION NEG signal idc_nop : std_logic; -- INSTRUCTION NOP signal idc_or : std_logic; -- INSTRUCTION OR signal idc_ori : std_logic; -- INSTRUCTION ORI signal idc_out : std_logic; -- INSTRUCTION OUT signal idc_pop : std_logic; -- INSTRUCTION POP signal idc_push : std_logic; -- INSTRUCTION PUSH signal idc_rcall : std_logic; -- INSTRUCTION RCALL signal idc_ret : std_logic; -- INSTRUCTION RET signal idc_reti : std_logic; -- INSTRUCTION RETI signal idc_rjmp : std_logic; -- INSTRUCTION RJMP signal idc_ror : std_logic; -- INSTRUCTION ROR signal idc_sbc : std_logic; -- INSTRUCTION SBC signal idc_sbci : std_logic; -- INSTRUCTION SBCI signal idc_sbi : std_logic; -- INSTRUCTION SBI signal idc_sbic : std_logic; -- INSTRUCTION SBIC signal idc_sbis : std_logic; -- INSTRUCTION SBIS signal idc_sbiw : std_logic; -- INSTRUCTION SBIW signal idc_sbrc : std_logic; -- INSTRUCTION SBRC signal idc_sbrs : std_logic; -- INSTRUCTION SBRS signal idc_sleep : std_logic; -- INSTRUCTION SLEEP signal idc_st_x : std_logic; -- INSTRUCTION LD X,Rx ; LD X+,Rx ;LD -X,Rx signal idc_st_y : std_logic; -- INSTRUCTION LD Y,Rx ; LD Y+,Rx ;LD -Y,Rx signal idc_std_y : std_logic; -- INSTRUCTION LDD Y+q,Rx signal idc_st_z : std_logic; -- INSTRUCTION LD Z,Rx ; LD Z+,Rx ;LD -Z,Rx signal idc_std_z : std_logic; -- INSTRUCTION LDD Z+q,Rx signal idc_sts : std_logic; -- INSTRUCTION STS signal idc_sub : std_logic; -- INSTRUCTION SUB signal idc_subi : std_logic; -- INSTRUCTION SUBI signal idc_swap : std_logic; -- INSTRUCTION SWAP signal idc_wdr : std_logic; -- INSTRUCTION WDR -- ADDITIONAL SIGNALS signal idc_psinc : std_logic; -- POST INCREMENT FLAG FOR LD,ST INSTRUCTIONS signal idc_prdec : std_logic; -- PRE DECREMENT FLAG FOR LD,ST INSTRUCTIONS -- ################################################## -- SREG FLAGS WRITE ENABLE SIGNALS --alias sreg_c_wr_en : std_logic is sreg_fl_wr_en(0); --alias sreg_z_wr_en : std_logic is sreg_fl_wr_en(1); --alias sreg_n_wr_en : std_logic is sreg_fl_wr_en(2); --alias sreg_v_wr_en : std_logic is sreg_fl_wr_en(3); --alias sreg_s_wr_en : std_logic is sreg_fl_wr_en(4); --alias sreg_h_wr_en : std_logic is sreg_fl_wr_en(5); --alias sreg_t_wr_en : std_logic is sreg_fl_wr_en(6); --alias sreg_i_wr_en : std_logic is sreg_fl_wr_en(7); signal sreg_c_wr_en : std_logic; -- is sreg_fl_wr_en(0); signal sreg_z_wr_en : std_logic; -- is sreg_fl_wr_en(1); signal sreg_n_wr_en : std_logic; -- is sreg_fl_wr_en(2); signal sreg_v_wr_en : std_logic; -- is sreg_fl_wr_en(3); signal sreg_s_wr_en : std_logic; -- is sreg_fl_wr_en(4); signal sreg_h_wr_en : std_logic; -- is sreg_fl_wr_en(5); signal sreg_t_wr_en : std_logic; -- is sreg_fl_wr_en(6); signal sreg_i_wr_en : std_logic; -- is sreg_fl_wr_en(7); signal sreg_bop_wr_en : std_logic_vector (7 downto 0); signal sreg_adr_eq : std_logic; -- &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& begin sreg_fl_wr_en <= sreg_i_wr_en & sreg_t_wr_en & sreg_h_wr_en & sreg_s_wr_en & sreg_v_wr_en & sreg_n_wr_en & sreg_z_wr_en & sreg_c_wr_en; -- INSTRUCTION FETCH instruction_reg_ena <= '1'; -- FOR TEST instruction_fetch:process(cp2,ireset) begin if ireset='0' then -- RESET instruction_reg <= (others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if instruction_reg_ena='1' then instruction_reg <= inst; end if; end if; end if; end process; -- TWO WORDS INSTRUCTION DETECTOR (CONNECTED DIRECTLY TO THE INSTRUCTION REGISTER) two_word_inst <= '1' when ((instruction_reg(15 downto 9)&instruction_reg(3 downto 1)="1001010111") or -- CALL (instruction_reg(15 downto 9)&instruction_reg(3 downto 1)="1001010110")) or -- JMP (instruction_reg(15 downto 9)&instruction_reg(3 downto 0) = "10010000000") or -- LDS (instruction_reg(15 downto 9)&instruction_reg(3 downto 0) = "10010010000") -- STS else '0'; -- TO DETECT CALL/JMP/LDS/STS INSTRUCTIONS FOR SBRS/SBRC/SBIS/SBIC/CPSE -- DATA EXTRACTOR (CONNECTED DIRECTLY TO THE INSTRUCTION REGISTER) dex_dat8_immed <= instruction_reg(11 downto 8) & instruction_reg(3 downto 0); dex_dat6_immed <= instruction_reg(7 downto 6) & instruction_reg(3 downto 0); dex_adr12mem_s <= instruction_reg(11 downto 0); dex_adr6port <= instruction_reg(10 downto 9) & instruction_reg(3 downto 0); dex_adr5port <= instruction_reg(7 downto 3); dex_adr_disp <= instruction_reg(13) & instruction_reg(11 downto 10) & instruction_reg(2 downto 0); dex_condition <= instruction_reg(2 downto 0); dex_bitop_bitnum <= instruction_reg(2 downto 0); -- NUMBER(POSITION) OF TESTING BIT IN SBRC/SBRS/SBIC/SBIS INSTRUCTION dex_bitnum_sreg <= instruction_reg(6 downto 4); dex_adrreg_r <= instruction_reg(9) & instruction_reg(3 downto 0); dex_adrreg_d <= instruction_reg(8 downto 4); dex_brxx_offset <= instruction_reg(9 downto 3); -- OFFSET FOR BRBC/BRBS dex_adiw_sbiw_reg_adr <= instruction_reg(5 downto 4); -- ADDRESS OF THE LOW REGISTER FOR ADIW/SBIW INSTRUCTIONS --dex_adrindreg <= instruction_reg(3 downto 2); -- LATCH Rd ADDDRESS FOR LDS/STS/POP INSTRUCTIONS latcht_rd_adr:process(cp2,ireset) begin if ireset ='0' then dex_adrreg_d_latched <= (others => '0'); elsif (cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable if ((idc_ld_x or idc_ld_y or idc_ldd_y or idc_ld_z or idc_ldd_z) or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)or idc_lds or idc_pop)='1' then dex_adrreg_d_latched <= dex_adrreg_d; end if; end if; end if; end process; -- +++++++++++++++++++++++++++++++++++++++++++++++++ -- R24:R25/R26:R27/R28:R29/R30:R31 ADIW/SBIW ADDRESS CONTROL LOGIC adiw_sbiw_encoder_out <= "11"&dex_adiw_sbiw_reg_adr&'0'; adiw_sbiw_high_reg_adr:process(cp2,ireset) begin if ireset ='0' then adiw_sbiw_encoder_mux_out <= (others=>'0'); elsif(cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable adiw_sbiw_encoder_mux_out <= adiw_sbiw_encoder_out +1; end if; end if; end process; -- ########################## -- NOP INSERTION --instruction_code_reg <= instruction_reg when nop_insert_st='0' else (others => '0'); instruction_code_reg <= (others => '0') when (nop_insert_st='1') else -- NOP instruction_reg; -- Instruction nop_insert_st <= adiw_st or sbiw_st or cbi_st or sbi_st or rjmp_st or ijmp_st or pop_st or push_st or brxx_st or ld_st or st_st or ncall_st0 or nirq_st0 or nret_st0 or nreti_st0 or nlpm_st0 or njmp_st0 or nrcall_st0 or nicall_st0 or sts_st or lds_st or nskip_inst_st0; -- INSTRUCTION DECODER (CONNECTED AFTER NOP INSERTION LOGIC) idc_adc <= '1' when instruction_code_reg(15 downto 10) = "000111" else '0'; -- 000111XXXXXXXXXX idc_add <= '1' when instruction_code_reg(15 downto 10) = "000011" else '0'; -- 000011XXXXXXXXXX idc_adiw <= '1' when instruction_code_reg(15 downto 8) = "10010110" else '0'; -- 10010110XXXXXXXX idc_and <= '1' when instruction_code_reg(15 downto 10) = "001000" else '0'; -- 001000XXXXXXXXXX idc_andi <= '1' when instruction_code_reg(15 downto 12) = "0111" else '0'; -- 0111XXXXXXXXXXXX idc_asr <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100101" else '0'; -- 1001010XXXXX0101 idc_bclr <= '1' when instruction_code_reg(15 downto 7)&instruction_code_reg(3 downto 0) = "1001010011000" else '0'; -- 100101001XXX1000 idc_bld <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3) = "11111000" else '0'; -- 1111100XXXXX0XXX idc_brbc <= '1' when instruction_code_reg(15 downto 10) = "111101" else '0'; -- 111101XXXXXXXXXX idc_brbs <= '1' when instruction_code_reg(15 downto 10) = "111100" else '0'; -- 111100XXXXXXXXXX idc_bset <= '1' when instruction_code_reg(15 downto 7)&instruction_code_reg(3 downto 0) = "1001010001000" else '0'; -- 100101000XXX1000 idc_bst <= '1' when instruction_code_reg(15 downto 9) = "1111101" else '0'; -- 1111101XXXXXXXXX idc_call <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 1) = "1001010111" else '0'; -- 1001010XXXXX111X idc_cbi <= '1' when instruction_code_reg(15 downto 8) = "10011000" else '0'; -- 10011000XXXXXXXX idc_com <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100000" else '0'; -- 1001010XXXXX0000 idc_cp <= '1' when instruction_code_reg(15 downto 10) = "000101" else '0'; -- 000101XXXXXXXXXX idc_cpc <= '1' when instruction_code_reg(15 downto 10) = "000001" else '0'; -- 000001XXXXXXXXXX idc_cpi <= '1' when instruction_code_reg(15 downto 12) = "0011" else '0'; -- 0011XXXXXXXXXXXX idc_cpse <= '1' when instruction_code_reg(15 downto 10) = "000100" else '0'; -- 000100XXXXXXXXXX idc_dec <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010101010" else '0'; -- 1001010XXXXX1010 idc_elpm <= '1' when instruction_code_reg = "1001010111011000" else '0'; -- 1001010111011000 idc_eor <= '1' when instruction_code_reg(15 downto 10) = "001001" else '0'; -- 001001XXXXXXXXXX idc_icall<= '1' when instruction_code_reg(15 downto 8)&instruction_code_reg(3 downto 0) = "100101011001" else '0'; -- 10010101XXXX1001 idc_ijmp <= '1' when instruction_code_reg(15 downto 8)&instruction_code_reg(3 downto 0) = "100101001001" else '0'; -- 10010100XXXX1001 idc_in <= '1' when instruction_code_reg(15 downto 11) = "10110" else '0'; -- 10110XXXXXXXXXXX idc_inc <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100011" else '0'; -- 1001010XXXXX0011 idc_jmp <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 1) = "1001010110" else '0'; -- 1001010XXXXX110X -- LD,LDD idc_ld_x <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010001100" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010001101" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010001110" else '0'; idc_ld_y <= '1' when (instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010001001" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010001010") else '0'; idc_ldd_y<= '1' when instruction_code_reg(15 downto 14)&instruction_code_reg(12)&instruction_code_reg(9)&instruction_code_reg(3) = "10001" else '0'; -- 10X0XX0XXXXX1XXX idc_ld_z <= '1' when (instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010000001" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010000010") else '0'; idc_ldd_z<= '1' when instruction_code_reg(15 downto 14)&instruction_code_reg(12)&instruction_code_reg(9)&instruction_code_reg(3) = "10000" else '0'; -- 10X0XX0XXXXX0XXX -- ###### idc_ldi <= '1' when instruction_code_reg(15 downto 12) = "1110" else '0'; -- 1110XXXXXXXXXXXX idc_lds <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010000000" else '0'; -- 1001000XXXXX0000 idc_lpm <= '1' when instruction_code_reg = "1001010111001000" else '0'; -- 1001010111001000 idc_lsr <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100110" else '0'; -- 1001010XXXXX0110 idc_mov <= '1' when instruction_code_reg(15 downto 10) = "001011" else '0'; -- 001011XXXXXXXXXX idc_mul <= '1' when instruction_code_reg(15 downto 10) = "100111" else '0'; -- 100111XXXXXXXXXX idc_neg <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100001" else '0'; -- 1001010XXXXX0001 idc_nop <= '1' when instruction_code_reg = "0000000000000000" else '0'; -- 0000000000000000 idc_or <= '1' when instruction_code_reg(15 downto 10) = "001010" else '0'; -- 001010XXXXXXXXXX idc_ori <= '1' when instruction_code_reg(15 downto 12) = "0110" else '0'; -- 0110XXXXXXXXXXXX idc_out <= '1' when instruction_code_reg(15 downto 11) = "10111" else '0'; -- 10111XXXXXXXXXXX idc_pop <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010001111" else '0'; -- 1001000XXXXX1111 idc_push<= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010011111" else '0'; -- 1001001XXXXX1111 idc_rcall<= '1' when instruction_code_reg(15 downto 12) = "1101" else '0'; -- 1101XXXXXXXXXXXX idc_ret <= '1' when instruction_code_reg(15 downto 7)&instruction_code_reg(4 downto 0) = "10010101001000" else '0'; -- 100101010XX01000 idc_reti <= '1' when instruction_code_reg(15 downto 7)&instruction_code_reg(4 downto 0) = "10010101011000" else '0'; -- 100101010XX11000 idc_rjmp <= '1' when instruction_code_reg(15 downto 12) = "1100" else '0'; -- 1100XXXXXXXXXXXX idc_ror <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100111" else '0'; -- 1001010XXXXX0111 idc_sbc <= '1' when instruction_code_reg(15 downto 10) = "000010" else '0'; -- 000010XXXXXXXXXX idc_sbci <= '1' when instruction_code_reg(15 downto 12) = "0100" else '0'; -- 0100XXXXXXXXXXXX idc_sbi <= '1' when instruction_code_reg(15 downto 8) = "10011010" else '0'; -- 10011010XXXXXXXX idc_sbic <= '1' when instruction_code_reg(15 downto 8) = "10011001" else '0'; -- 10011001XXXXXXXX idc_sbis <= '1' when instruction_code_reg(15 downto 8) = "10011011" else '0'; -- 10011011XXXXXXXX idc_sbiw <= '1' when instruction_code_reg(15 downto 8) = "10010111" else '0'; -- 10010111XXXXXXXX idc_sbrc <= '1' when instruction_code_reg(15 downto 9) = "1111110" else '0'; -- 1111110XXXXXXXXX idc_sbrs <= '1' when instruction_code_reg(15 downto 9) = "1111111" else '0'; -- 1111111XXXXXXXXX idc_sleep<= '1' when instruction_code_reg(15 downto 5)&instruction_code_reg(3 downto 0) = "100101011001000" else '0'; -- 10010101100X1000 -- ST,STD idc_st_x <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010011100" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010011101" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010011110" else '0'; idc_st_y <= '1' when (instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010011001" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010011010") else '0'; idc_std_y<= '1' when instruction_code_reg(15 downto 14)&instruction_code_reg(12)&instruction_code_reg(9)&instruction_code_reg(3) = "10011" else '0'; -- 10X0XX1XXXXX1XXX idc_st_z <= '1' when (instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010010001" or instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0)="10010010010") else '0'; idc_std_z<= '1' when instruction_code_reg(15 downto 14)&instruction_code_reg(12)&instruction_code_reg(9)&instruction_code_reg(3) = "10010" else '0'; -- 10X0XX1XXXXX0XXX -- ###### idc_sts <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010010000" else '0'; -- 1001001XXXXX0000 idc_sub <= '1' when instruction_code_reg(15 downto 10) = "000110" else '0'; -- 000110XXXXXXXXXX idc_subi <= '1' when instruction_code_reg(15 downto 12) = "0101" else '0'; -- 0101XXXXXXXXXXXX idc_swap <= '1' when instruction_code_reg(15 downto 9)&instruction_code_reg(3 downto 0) = "10010100010" else '0'; -- 1001010XXXXX0010 idc_wdr <= '1' when instruction_code_reg(15 downto 5)&instruction_code_reg(3 downto 0) = "100101011011000" else '0'; -- 10010101101X1000 -- ADDITIONAL SIGNALS idc_psinc <= '1' when (instruction_code_reg(1 downto 0) = "01" and (idc_st_x or idc_st_y or idc_st_z or idc_ld_x or idc_ld_y or idc_ld_z)='1') else '0'; -- POST INCREMENT FOR LD/ST INSTRUCTIONS idc_prdec <= '1' when (instruction_code_reg(1 downto 0) = "10" and (idc_st_x or idc_st_y or idc_st_z or idc_ld_x or idc_ld_y or idc_ld_z)='1') else '0'; -- PRE DECREMENT FOR LD/ST INSTRUCTIONS -- ########################################################################################################## -- WRITE ENABLE SIGNALS FOR ramadr_reg ramadr_reg_en <= idc_ld_x or idc_ld_y or idc_ldd_y or idc_ld_z or idc_ldd_z or idc_lds or -- LD/LDD/LDS(two cycle execution) idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z or idc_sts or -- ST/STS/STS(two cycle execution) idc_push or idc_pop or idc_rcall or (rcall_st1 and not cpuwait) or idc_icall or (icall_st1 and not cpuwait) or -- RCALL/ICALL call_st1 or (call_st2 and not cpuwait) or irq_st1 or (irq_st2 and not cpuwait) or -- CALL/IRQ idc_ret or (ret_st1 and not cpuwait ) or idc_reti or (reti_st1 and not cpuwait); -- RET/RETI -- ?? -- RAMADR MUX ramadr_reg_in <= sph_out&spl_out when (idc_rcall or (rcall_st1 and not cpuwait)or idc_icall or (icall_st1 and not cpuwait)or -- RCALL/ICALL call_st1 or (call_st2 and not cpuwait) or irq_st1 or (irq_st2 and not cpuwait) or -- CALL/IRQ idc_push )='1' else -- PUSH (sph_out&spl_out)+1 when (idc_ret or (ret_st1 and not cpuwait) or idc_reti or (reti_st1 and not cpuwait) or idc_pop)='1' else -- RET/RETI/POP inst when (idc_lds or idc_sts) ='1' else -- LDS/STS (two cycle execution) reg_h_out when (idc_ld_x or idc_ld_y or idc_ld_z or idc_st_x or idc_st_y or idc_st_z)='1' else -- LD/ST (reg_h_out + ("000000000"&dex_adr_disp)); -- LDD/STD -- ADDRESS REGISTER ramadr_reg:process(cp2,ireset) begin if ireset='0' then ramadr_int <= (others => '0'); elsif(cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable if (ramadr_reg_en='1') then ramadr_int <= ramadr_reg_in; end if; end if; end if; end process; ramadr <= ramadr_int; -- GENERAL PURPOSE REGISTERS ADDRESSING FLAG FOR ST/STD/STS INSTRUCTIONS gp_reg_adr:process(cp2,ireset) begin if ireset='0' then reg_file_adr_space <='0'; elsif(cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable if (ramadr_reg_en='1') then if (ramadr_reg_in(15 downto 5)=const_ram_to_reg) then reg_file_adr_space <= '1'; -- ADRESS RANGE 0x0000-0x001F -> REGISTERS (R0-R31) else reg_file_adr_space <= '0'; end if; end if; end if; end if; end process; -- I/O REGISTERS ADDRESSING FLAG FOR ST/STD/STS INSTRUCTIONS io_reg_adr:process(cp2,ireset) begin if ireset='0' then io_file_adr_space<='0'; elsif(cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable if (ramadr_reg_en='1') then if (ramadr_reg_in(15 downto 5)=const_ram_to_io_a or ramadr_reg_in(15 downto 5)=const_ram_to_io_b) then io_file_adr_space <= '1'; -- ADRESS RANGE 0x0020-0x005F -> I/O PORTS (0x00-0x3F) else io_file_adr_space <= '0'; end if; end if; end if; end if; end process; -- ########################################################################################################## -- REGRE/REGWE LOGIC (5 BIT ADDSRESS BUS (INTERNAL ONLY) 32 LOCATIONS (R0-R31)) -- WRITE ENABLE FOR Rd REGISTERS alu_reg_wr <= idc_adc or idc_add or idc_adiw or adiw_st or idc_sub or idc_subi or idc_sbc or idc_sbci or idc_sbiw or sbiw_st or idc_and or idc_andi or idc_or or idc_ori or idc_eor or idc_com or idc_neg or idc_inc or idc_dec or idc_lsr or idc_ror or idc_asr or idc_swap; reg_rd_wr <= idc_in or alu_reg_wr or idc_bld or -- ALU INSTRUCTIONS + IN/BLD INSRTRUCTION (pop_st or ld_st or lds_st)or -- POP/LD/LDD/LDS INSTRUCTIONS ((st_st or sts_st) and reg_file_adr_space)or -- ST/STD/STS INSTRUCTION lpm_st2 or idc_ldi or idc_mov; -- LPM/LDI/MOV INSTRUCTION reg_rd_adr <= '1'&dex_adrreg_d(3 downto 0) when (idc_subi or idc_sbci or idc_andi or idc_ori or idc_cpi or idc_ldi)='1' else "00000" when lpm_st2='1' else adiw_sbiw_encoder_out when (idc_adiw or idc_sbiw)='1' else adiw_sbiw_encoder_mux_out when (adiw_st or sbiw_st)='1' else dex_adrreg_d_latched when (((st_st or sts_st) and not reg_file_adr_space) or ld_st or lds_st or pop_st)='1' else ramadr_int(4 downto 0) when ((st_st or sts_st) and reg_file_adr_space)='1'else --!!?? dex_adrreg_d; reg_rd_adr_int <= '1'&dex_adrreg_d(3 downto 0) when (idc_subi or idc_sbci or idc_andi or idc_ori or idc_cpi or idc_ldi)='1' else "00000" when lpm_st2='1' else adiw_sbiw_encoder_out when (idc_adiw or idc_sbiw)='1' else adiw_sbiw_encoder_mux_out when (adiw_st or sbiw_st)='1' else dex_adrreg_d_latched when (((st_st or sts_st) and not reg_file_adr_space) or ld_st or lds_st or pop_st)='1' else ramadr_int(4 downto 0) when ((st_st or sts_st) and reg_file_adr_space)='1'else --!!?? dex_adrreg_d; reg_rr_adr <= ramadr_int(4 downto 0) when ((ld_st or lds_st) and reg_file_adr_space)='1'else --!!?? dex_adrreg_d_latched when ((st_st or sts_st) and reg_file_adr_space)='1'else --!!?? dex_adrreg_r; -- MULTIPLEXER FOR REGISTER FILE Rd INPUT reg_rd_in <= dbusin when (idc_in or ((lds_st or ld_st)and not reg_file_adr_space) or pop_st)='1' else -- FROM INPUT DATA BUS reg_rr_out when ((lds_st or ld_st) and reg_file_adr_space)='1' else gp_reg_tmp when ((st_st or sts_st) and reg_file_adr_space)='1' else -- ST/STD/STS & ADDRESS FROM 0 TO 31 (REGISTER FILE) bld_op_out when (idc_bld='1')else -- FROM BIT PROCESSOR BLD COMMAND reg_rr_out when (idc_mov='1')else -- FOR MOV INSTRUCTION instruction_reg(15 downto 8) when (lpm_st2='1' and reg_z_out(0)='1') else -- LPM/ELPM instruction_reg(7 downto 0) when (lpm_st2='1' and reg_z_out(0)='0') else -- LPM/ELPM dex_dat8_immed when idc_ldi='1' else alu_data_out; -- FROM ALU DATA OUT -- IORE/IOWE LOGIC (6 BIT ADDRESS adr[5..0] FOR I/O PORTS(64 LOCATIONS)) iore_int <= idc_in or idc_sbi or idc_cbi or idc_sbic or idc_sbis or ((ld_st or lds_st) and io_file_adr_space); -- IN/SBI/CBI iowe_int <= '1' when ((idc_out or sbi_st or cbi_st) or ((st_st or sts_st) and io_file_adr_space))='1' else '0'; -- OUT/SBI/CBI + !! ST/STS/STD -- adr[5..0] BUS MULTIPLEXER adr_int <= dex_adr6port when (idc_in or idc_out) = '1' else -- IN/OUT INSTRUCTIONS '0'&dex_adr5port when (idc_cbi or idc_sbi or idc_sbic or idc_sbis) ='1' else -- CBI/SBI (READ PHASE) + SBIS/SBIC '0'&cbi_sbi_io_adr_tmp when (cbi_st or sbi_st)='1' else -- CBI/SBI (WRITE PHASE) ramadr_int(6)&ramadr_int(4 downto 0); -- LD/LDS/LDD/ST/STS/STD -- ramre LOGIC (16 BIT ADDRESS ramadr[15..0] FOR DATA RAM (64*1024-64-32 LOCATIONS)) --ramre_int <= not(reg_file_adr_space or io_file_adr_space) and -- (ld_st or lds_st2 or pop_st or -- LD/LDD/LDS/POP/ -- ret_st1 or ret_st2 or reti_st1 or reti_st2); -- RET/RETI DataMemoryRead:process(cp2,ireset) begin if ireset='0' then -- Reset ramre_int <= '0'; elsif (cp2='1' and cp2'event) then -- Clock if (cp2en='1') then -- Clock enable case ramre_int is when '0' => if(ramadr_reg_in(15 downto 5)/=const_ram_to_io_a and ramadr_reg_in(15 downto 5)/=const_ram_to_io_b and ramadr_reg_in(15 downto 5)/=const_ram_to_reg and (idc_ld_x or idc_ld_y or idc_ldd_y or idc_ld_z or idc_ldd_z or -- LD/LDD instruction idc_lds or -- LDS instruction(two cycle execution) idc_pop or -- POP instruction idc_ret or -- RET instruction idc_reti)='1') -- RETI instruction then ramre_int <='1'; end if; when '1' => if ((ld_st or lds_st or pop_st or ret_st2 or reti_st2)and not cpuwait)='1' then ramre_int <='0'; end if; when others => null; end case; end if; end if; end process; -- ramwe LOGIC (16 BIT ADDRESS ramadr[15..0] FOR DATA RAM (64*1024-64-32 LOCATIONS)) --ramwe_int <= not(reg_file_adr_space or io_file_adr_space) and -- (st_st or sts_st2 or push_st or rcall_st1 or rcall_st2 or -- ST/STD/STS/PUSH/RCALL -- icall_st1 or icall_st2 or -- ICALL -- call_st2 or call_st3 or -- CALL -- irq_st2 or irq_st3); -- INTERRUPT DataMemoryWrite:process(cp2,ireset) begin if ireset='0' then -- Reset ramwe_int <= '0'; elsif (cp2='1' and cp2'event) then -- Clock if (cp2en='1') then -- Clock enable case ramwe_int is when '0' => if(ramadr_reg_in(15 downto 5)/=const_ram_to_io_a and ramadr_reg_in(15 downto 5)/=const_ram_to_io_b and ramadr_reg_in(15 downto 5)/=const_ram_to_reg and (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z or -- ST/STD instruction idc_sts or -- STS instruction (two cycle execution) idc_push or -- PUSH instruction idc_rcall or -- RCALL instruction idc_icall or -- ICALL instruction call_st1 or -- CALL instruction irq_st1)='1') -- Interrupt then ramwe_int <='1'; end if; when '1' => if ((st_st or sts_st or push_st or rcall_st2 or icall_st2 or call_st3 or irq_st3)and not cpuwait)='1' then ramwe_int <='0'; end if; when others => null; end case; end if; end if; end process; -- DBUSOUT MULTIPLEXER --dbusout_mux_logic: for i in dbusout_int'range generate --dbusout_int(i)<= (reg_rd_out(i) and (idc_push or idc_sts or -- (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS -- (gp_reg_tmp(i) and (st_st or sts_st))or -- NEW -- (bitpr_io_out(i) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS -- (program_counter(i) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(i) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC -- (pc_for_interrupt(i) and irq_st1) or -- (pc_for_interrupt(8) and irq_st2) or -- (reg_rd_out(i) and idc_out); -- OUT --end generate; dbusout_int(0)<= (reg_rd_out(0) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(0) and (st_st or sts_st))or -- NEW (bitpr_io_out(0) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(0) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(0) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(0) and irq_st1) or (pc_for_interrupt(8) and irq_st2) or (reg_rd_out(0) and idc_out); -- OUT dbusout_int(1)<= (reg_rd_out(1) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(1) and (st_st or sts_st))or -- NEW (bitpr_io_out(1) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(1) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(1) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(1) and irq_st1) or (pc_for_interrupt(9) and irq_st2) or (reg_rd_out(1) and idc_out); -- OUT dbusout_int(2)<= (reg_rd_out(2) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(2) and (st_st or sts_st))or -- NEW (bitpr_io_out(2) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(2) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(2) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(2) and irq_st1) or (pc_for_interrupt(10) and irq_st2) or (reg_rd_out(2) and idc_out); -- OUT dbusout_int(3)<= (reg_rd_out(3) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(3) and (st_st or sts_st))or -- NEW (bitpr_io_out(3) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(3) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(3) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(3) and irq_st1) or (pc_for_interrupt(11) and irq_st2) or (reg_rd_out(3) and idc_out); -- OUT dbusout_int(4)<= (reg_rd_out(4) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(4) and (st_st or sts_st))or -- NEW (bitpr_io_out(4) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(4) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(4) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(4) and irq_st1) or (pc_for_interrupt(12) and irq_st2) or (reg_rd_out(4) and idc_out); -- OUT dbusout_int(5)<= (reg_rd_out(5) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(5) and (st_st or sts_st))or -- NEW (bitpr_io_out(5) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(5) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(5) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(5) and irq_st1) or (pc_for_interrupt(13) and irq_st2) or (reg_rd_out(5) and idc_out); -- OUT dbusout_int(6)<= (reg_rd_out(6) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(6) and (st_st or sts_st))or -- NEW (bitpr_io_out(6) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(6) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(6) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(6) and irq_st1) or (pc_for_interrupt(14) and irq_st2) or (reg_rd_out(6) and idc_out); -- OUT dbusout_int(7)<= (reg_rd_out(7) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(7) and (st_st or sts_st))or -- NEW (bitpr_io_out(7) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(7) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(7) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(7) and irq_st1) or (pc_for_interrupt(15) and irq_st2) or (reg_rd_out(7) and idc_out); -- OUT dbusout_int_route <= dbusout_int; dbusout(0)<= (reg_rd_out_int(0) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(0) and (st_st or sts_st))or -- NEW (bitpr_io_out(0) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(0) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(0) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(0) and irq_st1) or (pc_for_interrupt(8) and irq_st2) or (reg_rd_out_int(0) and idc_out); -- OUT dbusout(1)<= (reg_rd_out_int(1) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(1) and (st_st or sts_st))or -- NEW (bitpr_io_out(1) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(1) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(1) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(1) and irq_st1) or (pc_for_interrupt(9) and irq_st2) or (reg_rd_out_int(1) and idc_out); -- OUT dbusout(2)<= (reg_rd_out_int(2) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(2) and (st_st or sts_st))or -- NEW (bitpr_io_out(2) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(2) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(2) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(2) and irq_st1) or (pc_for_interrupt(10) and irq_st2) or (reg_rd_out_int(2) and idc_out); -- OUT dbusout(3)<= (reg_rd_out_int(3) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(3) and (st_st or sts_st))or -- NEW (bitpr_io_out(3) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(3) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(3) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(3) and irq_st1) or (pc_for_interrupt(11) and irq_st2) or (reg_rd_out_int(3) and idc_out); -- OUT dbusout(4)<= (reg_rd_out_int(4) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(4) and (st_st or sts_st))or -- NEW (bitpr_io_out(4) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(4) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(4) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(4) and irq_st1) or (pc_for_interrupt(12) and irq_st2) or (reg_rd_out_int(4) and idc_out); -- OUT dbusout(5)<= (reg_rd_out_int(5) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(5) and (st_st or sts_st))or -- NEW (bitpr_io_out(5) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(5) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(5) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(5) and irq_st1) or (pc_for_interrupt(13) and irq_st2) or (reg_rd_out_int(5) and idc_out); -- OUT dbusout(6)<= (reg_rd_out_int(6) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(6) and (st_st or sts_st))or -- NEW (bitpr_io_out(6) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(6) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(6) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(6) and irq_st1) or (pc_for_interrupt(14) and irq_st2) or (reg_rd_out_int(6) and idc_out); -- OUT dbusout(7)<= (reg_rd_out_int(7) and (idc_push or idc_sts or (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)))or -- PUSH/ST/STD/STS INSTRUCTIONS (gp_reg_tmp(7) and (st_st or sts_st))or -- NEW (bitpr_io_out(7) and (cbi_st or sbi_st))or -- CBI/SBI INSTRUCTIONS (program_counter(7) and (idc_rcall or idc_icall or call_st1))or -- LOW PART OF PC (program_counter_high_fr(7) and (rcall_st1 or icall_st1 or call_st2))or -- HIGH PART OF PC (pc_for_interrupt(7) and irq_st1) or (pc_for_interrupt(15) and irq_st2) or (reg_rd_out_int(7) and idc_out); -- OUT -- ALU CONNECTION -- ALU Rr INPUT MUX alu_data_r_in <= dex_dat8_immed when (idc_subi or idc_sbci or idc_andi or idc_ori or idc_cpi)='1' else "00"&dex_dat6_immed when (idc_adiw or idc_sbiw) ='1' else "00000000" when (adiw_st or sbiw_st) ='1' else reg_rr_out; -- gp_reg_tmp STORES TEMPREOARY THE VALUE OF SOURCE REGISTER DURING ST/STD/STS INSTRUCTION gp_registers_trig:process(cp2,ireset) begin if (ireset='0') then gp_reg_tmp <= (others=>'0'); elsif (cp2='1' and cp2'event) then if (cp2en='1') then -- Clock enable -- if ((idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z) or sts_st1)='1' then -- CLOCK ENABLE if ((idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z) or idc_sts)='1' then -- CLOCK ENABLE gp_reg_tmp <= reg_rd_out; end if; end if; end if; end process; -- ********************************************************************************************************** -- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -- +++++++++++++++++++++++++++++++++++++++ PROGRAM COUNTER ++++++++++++++++++++++++++++++++++++++++++++++++++ -- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ program_counter_high_store:process(cp2,ireset) begin if ireset='0' then -- RESET program_counter_high_fr <=(others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if (idc_rcall or idc_icall or call_st1 or irq_st1) ='1' then program_counter_high_fr <= program_counter(15 downto 8); -- STORE HIGH BYTE OF THE PROGRAMM COUNTER FOR RCALL/ICALL/CALL INSTRUCTIONS AND INTERRUPTS end if; end if; end if; end process; program_counter_for_lpm_elpm:process(cp2,ireset) begin if ireset='0' then -- RESET program_counter_tmp<=(others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if (idc_lpm or idc_elpm) ='1' then program_counter_tmp <= program_counter; end if; end if; end if; end process; pa15_pm <= rampz_out(0) and idc_elpm; -- '0' WHEN LPM INSTRUCTIONS RAMPZ(0) WHEN ELPM INSTRUCTION -- OFFSET FOR BRBC/BRBS INSTRUCTIONS +63/-64 offset_brbx <= "0000000000"&dex_brxx_offset(5 downto 0) when (dex_brxx_offset(6)='0') else -- + "1111111111"&dex_brxx_offset(5 downto 0); -- - -- OFFSET FOR RJMP/RCALL INSTRUCTIONS +2047/-2048 offset_rxx <= "00000"&dex_adr12mem_s(10 downto 0) when (dex_adr12mem_s(11)='0') else -- + "11111"&dex_adr12mem_s(10 downto 0); -- - program_counter <= pc_high&pc_low; program_counter_in <= program_counter + offset_brbx when ((idc_brbc or idc_brbs) and bit_test_op_out) ='1'else -- BRBC/BRBS program_counter + offset_rxx when (idc_rjmp or idc_rcall)='1'else -- RJMP/RCALL reg_z_out when (idc_ijmp or idc_icall)='1'else -- IJMP/ICALL pa15_pm®_z_out(15 downto 1) when (idc_lpm or idc_elpm) ='1'else -- LPM/ELPM instruction_reg when (jmp_st1 or call_st1)='1'else -- JMP/CALL "0000000000"&irqackad_int&'0' when irq_st1 ='1' else -- INTERRUPT dbusin&"00000000" when (ret_st1 or reti_st1)='1' else -- RET/RETI -> PC HIGH BYTE "00000000"&dbusin when (ret_st2 or reti_st2)='1' else -- RET/RETI -> PC LOW BYTE program_counter_tmp when (lpm_st1)='1' -- AFTER LPM/ELPM INSTRUCTION else program_counter+1; -- THE MOST USUAL CASE pc_low_en <= not (idc_ld_x or idc_ld_y or idc_ld_z or idc_ldd_y or idc_ldd_z or idc_st_x or idc_st_y or idc_st_z or idc_std_y or idc_std_z or ((sts_st or lds_st) and cpuwait)or idc_adiw or idc_sbiw or idc_push or idc_pop or idc_cbi or idc_sbi or rcall_st1 or icall_st1 or call_st2 or irq_st2 or cpuwait or ret_st1 or reti_st1); pc_high_en <= not (idc_ld_x or idc_ld_y or idc_ld_z or idc_ldd_y or idc_ldd_z or idc_st_x or idc_st_y or idc_st_z or idc_std_y or idc_std_z or ((sts_st or lds_st) and cpuwait) or idc_adiw or idc_sbiw or idc_push or idc_pop or idc_cbi or idc_sbi or rcall_st1 or icall_st1 or call_st2 or irq_st2 or cpuwait or ret_st2 or reti_st2); program_counter_low:process(cp2,ireset) begin if ireset='0' then -- RESET pc_low<=(others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if pc_low_en ='1' then pc_low <= program_counter_in(7 downto 0); end if; end if; end if; end process; program_counter_high:process(cp2,ireset) begin if ireset='0' then -- RESET pc_high<=(others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if pc_high_en ='1' then pc_high <= program_counter_in(15 downto 8); end if; end if; end if; end process; pc <= program_counter; program_counter_for_interrupt:process(cp2,ireset) begin if ireset='0' then -- RESET pc_for_interrupt <=(others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable if irq_start ='1' then pc_for_interrupt <= program_counter; end if; end if; end if; end process; -- END OF PROGRAM COUNTER -- STATE MACHINES skip_inst_start <= ((idc_sbrc or idc_sbrs or idc_sbic or idc_sbis) and bit_test_op_out)or (idc_cpse and alu_z_flag_out); skip_instruction_sm:process(cp2,ireset) begin if ireset='0' then -- RESET nskip_inst_st0 <= '0'; skip_inst_st1 <= '0'; skip_inst_st2 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nskip_inst_st0 <= (not nskip_inst_st0 and skip_inst_start) or (nskip_inst_st0 and not((skip_inst_st1 and not two_word_inst) or skip_inst_st2)); skip_inst_st1 <= (not skip_inst_st1 and not nskip_inst_st0 and skip_inst_start); skip_inst_st2 <= not skip_inst_st2 and skip_inst_st1 and two_word_inst; end if; end if; end process; alu_state_machines:process(cp2,ireset) begin if ireset='0' then -- RESET adiw_st <= '0'; sbiw_st <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable adiw_st <= not adiw_st and idc_adiw; sbiw_st <= not sbiw_st and idc_sbiw; end if; end if; end process; lpm_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nlpm_st0 <= '0'; lpm_st1 <= '0'; lpm_st2 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nlpm_st0 <= (not nlpm_st0 and (idc_lpm or idc_elpm)) or (nlpm_st0 and not lpm_st2); lpm_st1 <= (not lpm_st1 and not nlpm_st0 and (idc_lpm or idc_elpm)); -- ?? lpm_st2 <= not lpm_st2 and lpm_st1; end if; end if; end process; lds_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET lds_st <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable lds_st <= (not lds_st and idc_lds) or (lds_st and cpuwait); end if; end if; end process; sts_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET sts_st <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable sts_st <= (not sts_st and idc_sts) or (sts_st and cpuwait); end if; end if; end process; jmp_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET njmp_st0 <= '0'; jmp_st1 <= '0'; jmp_st2 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable njmp_st0 <= (not njmp_st0 and idc_jmp) or (njmp_st0 and not jmp_st2); jmp_st1 <= not jmp_st1 and not njmp_st0 and idc_jmp; -- ?? jmp_st2 <= not jmp_st2 and jmp_st1; end if; end if; end process; rcall_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nrcall_st0 <= '0'; rcall_st1 <= '0'; rcall_st2 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nrcall_st0 <= (not nrcall_st0 and idc_rcall) or (nrcall_st0 and not (rcall_st2 and not cpuwait)); rcall_st1 <= (not rcall_st1 and not nrcall_st0 and idc_rcall) or (rcall_st1 and cpuwait); rcall_st2 <= (not rcall_st2 and rcall_st1 and not cpuwait) or (rcall_st2 and cpuwait); end if; end if; end process; icall_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nicall_st0 <= '0'; icall_st1 <= '0'; icall_st2 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nicall_st0 <= (not nicall_st0 and idc_icall) or (nicall_st0 and not (icall_st2 and not cpuwait)); icall_st1 <= (not icall_st1 and not nicall_st0 and idc_icall) or (icall_st1 and cpuwait); icall_st2 <= (not icall_st2 and icall_st1 and not cpuwait) or (icall_st2 and cpuwait); end if; end if; end process; call_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET ncall_st0 <= '0'; call_st1 <= '0'; call_st2 <= '0'; call_st3 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable ncall_st0 <= (not ncall_st0 and idc_call) or (ncall_st0 and not( call_st3 and not cpuwait)); call_st1 <= not call_st1 and not ncall_st0 and idc_call; call_st2 <= (not call_st2 and call_st1) or (call_st2 and cpuwait); call_st3 <= (not call_st3 and call_st2 and not cpuwait) or (call_st3 and cpuwait); end if; end if; end process; ret_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nret_st0 <= '0'; ret_st1 <= '0'; ret_st2 <= '0'; ret_st3 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nret_st0 <= (not nret_st0 and idc_ret) or (nret_st0 and not ret_st3); ret_st1 <= (not ret_st1 and not nret_st0 and idc_ret) or (ret_st1 and cpuwait); ret_st2 <= (not ret_st2 and ret_st1 and not cpuwait) or (ret_st2 and cpuwait) ; ret_st3 <= not ret_st3 and ret_st2 and not cpuwait; end if; end if; end process; reti_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nreti_st0 <= '0'; reti_st1 <= '0'; reti_st2 <= '0'; reti_st3 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nreti_st0 <= (not nreti_st0 and idc_reti) or (nreti_st0 and not reti_st3); reti_st1 <= (not reti_st1 and not nreti_st0 and idc_reti) or (reti_st1 and cpuwait); reti_st2 <= (not reti_st2 and reti_st1 and not cpuwait) or (reti_st2 and cpuwait) ; reti_st3 <= not reti_st3 and reti_st2 and not cpuwait; end if; end if; end process; -- INTERRUPT LOGIC AND STATE MACHINE irq_int <= '0' when irqlines="00000000000000000000000" else '1'; irq_vector_adr(15 downto 6)<=(others => '0'); irq_vector_adr(0) <= '0'; -- PRIORITY ENCODER irq_vector_adr(5 downto 1) <= "00001" when irqlines(0)='1' else -- 0x0002 "00010" when irqlines(1)='1' else -- 0x0004 "00011" when irqlines(2)='1' else -- 0x0006 "00100" when irqlines(3)='1' else -- 0x0008 "00101" when irqlines(4)='1' else -- 0x000A "00110" when irqlines(5)='1' else -- 0x000C "00111" when irqlines(6)='1' else -- 0x000E "01000" when irqlines(7)='1' else -- 0x0010 "01001" when irqlines(8)='1' else -- 0x0012 "01010" when irqlines(9)='1' else -- 0x0014 "01011" when irqlines(10)='1' else -- 0x0016 "01100" when irqlines(11)='1' else -- 0x0018 "01101" when irqlines(12)='1' else -- 0x001A "01110" when irqlines(13)='1' else -- 0x001C "01111" when irqlines(14)='1' else -- 0x001E "10000" when irqlines(15)='1' else -- 0x0020 "10001" when irqlines(16)='1' else -- 0x0022 "10010" when irqlines(17)='1' else -- 0x0024 "10011" when irqlines(18)='1' else -- 0x0026 "10100" when irqlines(19)='1' else -- 0x0028 "10101" when irqlines(20)='1' else -- 0x002A "10110" when irqlines(21)='1' else -- 0x002C "10111" when irqlines(22)='1' else -- 0x002E "00000"; -- MULTI CYCLE INSTRUCTION FLAG FOR IRQ cpu_busy <= idc_adiw or idc_sbiw or idc_cbi or idc_sbi or idc_rjmp or idc_ijmp or idc_jmp or jmp_st1 or -- idc_brbs or idc_brbc or -- Old variant ((idc_brbc or idc_brbs) and bit_test_op_out) or idc_lpm or lpm_st1 or skip_inst_start or (skip_inst_st1 and two_word_inst) or idc_ld_x or idc_ld_y or idc_ldd_y or idc_ld_z or idc_ldd_z or (ld_st and cpuwait) or idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z or (st_st and cpuwait) or idc_lds or (lds_st and cpuwait) or idc_sts or (sts_st and cpuwait) or idc_rcall or rcall_st1 or (rcall_st2 and cpuwait) or -- RCALL idc_icall or icall_st1 or (icall_st2 and cpuwait) or -- ICALL idc_call or call_st1 or call_st2 or (call_st3 and cpuwait) or -- CALL idc_push or (push_st and cpuwait) or -- PUSH (added 14.07.05) idc_pop or (pop_st and cpuwait) or -- POP (added 14.07.05) (idc_bclr and sreg_bop_wr_en(7)) or -- ??? CLI (iowe_int and sreg_adr_eq and not dbusout_int(7))or -- ??? Writing '0' to I flag (OUT/STD/ST/STD) nirq_st0 or -- idc_ret or nret_st0 or -- Old variant idc_ret or ret_st1 or ret_st2 or -- idc_reti or nreti_st0; -- At least one instruction must be executed after RETI and before the new interrupt. idc_reti or reti_st1 or reti_st2; sreg_adr_eq <= '1' when adr_int=SREG_Address else '0'; --irq_start <= irq_int and not cpu_busy and globint; irq_start <= irq_int and not cpu_busy and globint; irq_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET nirq_st0 <= '0'; irq_st1 <= '0'; irq_st2 <= '0'; irq_st3 <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable nirq_st0 <= (not nirq_st0 and irq_start) or (nirq_st0 and not (irq_st3 and not cpuwait)); irq_st1 <= (not irq_st1 and not nirq_st0 and irq_start); irq_st2 <= (not irq_st2 and irq_st1) or (irq_st2 and cpuwait); irq_st3 <= (not irq_st3 and irq_st2 and not cpuwait) or (irq_st3 and cpuwait); end if; end if; end process; irqack_reg:process(cp2,ireset) begin if ireset='0' then -- RESET irqack_int<='0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable irqack_int<= not irqack_int and irq_start; end if; end if; end process; irqack <= irqack_int; irqackad_reg:process(cp2,ireset) begin if ireset='0' then -- RESET irqackad_int<=(others=>'0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable irqackad_int <= irq_vector_adr(5 downto 1); end if; end if; end process; irqackad <= irqackad_int; -- ******************************************************************************************* rjmp_push_pop_ijmp_state_brxx_machine:process(cp2,ireset) begin if ireset='0' then -- RESET rjmp_st <= '0'; ijmp_st <= '0'; push_st <= '0'; pop_st <= '0'; brxx_st <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable rjmp_st <= idc_rjmp; -- ?? ijmp_st <= idc_ijmp; push_st <= (not push_st and idc_push) or (push_st and cpuwait); pop_st <= (not pop_st and idc_pop) or (pop_st and cpuwait); brxx_st <= not brxx_st and (idc_brbc or idc_brbs) and bit_test_op_out; end if; end if; end process; -- LD/LDD/ST/STD ld_st_state_machine:process(cp2,ireset) begin if ireset='0' then -- RESET ld_st <= '0'; st_st <= '0'; elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable ld_st <= (not ld_st and (idc_ld_x or idc_ld_y or idc_ldd_y or idc_ld_z or idc_ldd_z)) or (ld_st and cpuwait); st_st <= (not st_st and (idc_st_x or idc_st_y or idc_std_y or idc_st_z or idc_std_z)) or (st_st and cpuwait); end if; end if; end process; -- SBI/CBI sbi_cbi_machine:process(cp2,ireset) begin if ireset='0' then -- RESET sbi_st <= '0'; cbi_st <= '0'; cbi_sbi_io_adr_tmp <= (others => '0'); cbi_sbi_bit_num_tmp <= (others => '0'); elsif (cp2='1' and cp2'event) then -- CLOCK if (cp2en='1') then -- Clock enable sbi_st <= not sbi_st and idc_sbi; cbi_st <= not cbi_st and idc_cbi; cbi_sbi_io_adr_tmp <= dex_adr5port; cbi_sbi_bit_num_tmp <= dex_bitop_bitnum; end if; end if; end process; -- ######################################################################################## -- SREG FLAGS WRITE ENABLE LOGIC --bclr_bset_op_en_logic:for i in sreg_bop_wr_en'range generate --sreg_bop_wr_en(i) <= '1' when (dex_bitnum_sreg=i and (idc_bclr or idc_bset)='1') else '0'; --end generate; sreg_bop_wr_en(0) <= '1' when (dex_bitnum_sreg=0 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(1) <= '1' when (dex_bitnum_sreg=1 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(2) <= '1' when (dex_bitnum_sreg=2 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(3) <= '1' when (dex_bitnum_sreg=3 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(4) <= '1' when (dex_bitnum_sreg=4 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(5) <= '1' when (dex_bitnum_sreg=5 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(6) <= '1' when (dex_bitnum_sreg=6 and (idc_bclr or idc_bset)='1') else '0'; sreg_bop_wr_en(7) <= '1' when (dex_bitnum_sreg=7 and (idc_bclr or idc_bset)='1') else '0'; sreg_c_wr_en <= idc_add or idc_adc or (idc_adiw or adiw_st) or idc_sub or idc_subi or idc_sbc or idc_sbci or (idc_sbiw or sbiw_st) or idc_com or idc_neg or idc_cp or idc_cpc or idc_cpi or idc_lsr or idc_ror or idc_asr or sreg_bop_wr_en(0); sreg_z_wr_en <= idc_add or idc_adc or (idc_adiw or adiw_st) or idc_sub or idc_subi or idc_sbc or idc_sbci or (idc_sbiw or sbiw_st) or idc_cp or idc_cpc or idc_cpi or idc_and or idc_andi or idc_or or idc_ori or idc_eor or idc_com or idc_neg or idc_inc or idc_dec or idc_lsr or idc_ror or idc_asr or sreg_bop_wr_en(1); sreg_n_wr_en <= idc_add or idc_adc or adiw_st or idc_sub or idc_subi or idc_sbc or idc_sbci or sbiw_st or idc_cp or idc_cpc or idc_cpi or idc_and or idc_andi or idc_or or idc_ori or idc_eor or idc_com or idc_neg or idc_inc or idc_dec or idc_lsr or idc_ror or idc_asr or sreg_bop_wr_en(2); sreg_v_wr_en <= idc_add or idc_adc or adiw_st or idc_sub or idc_subi or -- idc_adiw idc_sbc or idc_sbci or sbiw_st or idc_neg or idc_com or -- idc_sbiw idc_inc or idc_dec or idc_cp or idc_cpc or idc_cpi or idc_lsr or idc_ror or idc_asr or sreg_bop_wr_en(3) or idc_and or idc_andi or idc_or or idc_ori or idc_eor; -- V-flag bug fixing sreg_s_wr_en <= idc_add or idc_adc or adiw_st or idc_sub or idc_subi or idc_sbc or idc_sbci or sbiw_st or idc_cp or idc_cpc or idc_cpi or idc_and or idc_andi or idc_or or idc_ori or idc_eor or idc_com or idc_neg or idc_inc or idc_dec or idc_lsr or idc_ror or idc_asr or sreg_bop_wr_en(4); sreg_h_wr_en <= idc_add or idc_adc or idc_sub or idc_subi or idc_cp or idc_cpc or idc_cpi or idc_sbc or idc_sbci or idc_neg or sreg_bop_wr_en(5); sreg_t_wr_en <= idc_bst or sreg_bop_wr_en(6); sreg_i_wr_en <= irq_st1 or reti_st3 or sreg_bop_wr_en(7); -- WAS "irq_start" sreg_fl_in <= bit_pr_sreg_out when (idc_bst or idc_bclr or idc_bset)='1' else -- TO THE SREG reti_st3&'0'&alu_h_flag_out&alu_s_flag_out&alu_v_flag_out&alu_n_flag_out&alu_z_flag_out&alu_c_flag_out; -- ################################################################################################################# -- ********************************************************************************************* -- ************** INSTRUCTION DECODER OUTPUTS FOR THE OTHER BLOCKS **************************** -- ********************************************************************************************* -- FOR ALU idc_add_out <= idc_add; idc_adc_out <= idc_adc; idc_adiw_out <= idc_adiw; idc_sub_out <= idc_sub; idc_subi_out <= idc_subi; idc_sbc_out <= idc_sbc; idc_sbci_out <= idc_sbci; idc_sbiw_out <= idc_sbiw; adiw_st_out <= adiw_st; sbiw_st_out <= sbiw_st; idc_and_out <= idc_and; idc_andi_out <= idc_andi; idc_or_out <= idc_or; idc_ori_out <= idc_ori; idc_eor_out <= idc_eor; idc_com_out <= idc_com; idc_neg_out <= idc_neg; idc_inc_out <= idc_inc; idc_dec_out <= idc_dec; idc_cp_out <= idc_cp; idc_cpc_out <= idc_cpc; idc_cpi_out <= idc_cpi; idc_cpse_out <= idc_cpse; idc_lsr_out <= idc_lsr; idc_ror_out <= idc_ror; idc_asr_out <= idc_asr; idc_swap_out <= idc_swap; -- FOR THE BIT PROCESSOR sbi_st_out <= sbi_st; cbi_st_out <= cbi_st; idc_bst_out <= idc_bst; idc_bset_out <= idc_bset; idc_bclr_out <= idc_bclr; idc_sbic_out <= idc_sbic; idc_sbis_out <= idc_sbis; idc_sbrs_out <= idc_sbrs; idc_sbrc_out <= idc_sbrc; idc_brbs_out <= idc_brbs; idc_brbc_out <= idc_brbc; idc_reti_out <= idc_reti; -- POST INCREMENT/PRE DECREMENT FOR THE X,Y,Z REGISTERS post_inc <= idc_psinc; pre_dec <= idc_prdec; reg_h_wr <= (idc_st_x or idc_st_y or idc_st_z or idc_ld_x or idc_ld_y or idc_ld_z) and (idc_psinc or idc_prdec); reg_h_adr(0)<= idc_st_x or idc_ld_x; reg_h_adr(1)<= idc_st_y or idc_std_y or idc_ld_y or idc_ldd_y; reg_h_adr(2)<= idc_st_z or idc_std_z or idc_ld_z or idc_ldd_z; -- STACK POINTER CONTROL sp_ndown_up <= idc_pop or idc_ret or (ret_st1 and not cpuwait) or idc_reti or (reti_st1 and not cpuwait); -- ????????? sp_en <= idc_push or idc_pop or idc_rcall or (rcall_st1 and not cpuwait) or idc_icall or (icall_st1 and not cpuwait) or idc_ret or (ret_st1 and not cpuwait) or idc_reti or (reti_st1 and not cpuwait) or call_st1 or (call_st2 and not cpuwait) or irq_st1 or (irq_st2 and not cpuwait); --???????? branch <= dex_condition; bit_num_r_io <= cbi_sbi_bit_num_tmp when (cbi_st or sbi_st)='1' else dex_bitop_bitnum; adr <= adr_int; ramre <= ramre_int; ramwe <= ramwe_int; iore <= iore_int; iowe <= iowe_int; --dbusout <= dbusout_int; -- Sleep Control sleepi <= idc_sleep; irqok <= irq_int; -- Watchdog wdri <= idc_wdr; -- ************************** JTAG OCD support ************************************ -- Change of flow change_flow <= '0'; valid_instr <= '0'; end RTL;