Index: atari_chips/pokeyv2/pokeymaxv1.vhd =================================================================== --- atari_chips/pokeyv2/pokeymaxv1.vhd (revision 1529) +++ atari_chips/pokeyv2/pokeymaxv1.vhd (revision 1530) @@ -38,6 +38,7 @@ adc_audio_detect : integer := 0; -- Detect 0 crossing/amplitude etc, otherwise silence adc_fir_filter_v4 : integer := 0; -- Filter out interference from keyboard scan etc + sigmadelta_implementation : integer := 4; -- 4 is dithered 2nd order (recommended if it fits), 2 is 2nd order without dithering ext_bits : integer := 3; pll_v2 : integer := 1; @@ -58,11 +59,14 @@ sid_wave_base : integer := 42496; --to_integer(unsigned(x"a600")); + sample_ram_size : integer := 43008; --to_integer(unsigned(x"a600")); + flash_addr_bits : integer := 16; ext_clk_enable : integer := 0; -- Use PADDLE(6) for sid clk enable, PADDLE(7) for psg - version : STRING := "DEVELOPR" -- 8 char string atascii + version : STRING := "DEVELOPR"; -- 8 char string atascii + board : integer := 00 -- $MAJOR$MINOR ); PORT ( @@ -239,20 +243,18 @@ signal WRITE_DATA : std_logic_vector(7 downto 0); signal DEVICE_ADDR : std_logic_vector(3 downto 0); - signal POKEY_AUDIO_0 : unsigned(15 downto 0); - signal POKEY_AUDIO_1 : unsigned(15 downto 0); - signal POKEY_AUDIO_2 : unsigned(15 downto 0); - signal POKEY_AUDIO_3 : unsigned(15 downto 0); + signal POKEY_AUDIO_UNSIGNED : UNSIGNED_AUDIO_TYPE(3 downto 0); - signal AUDIO_0_UNSIGNED : unsigned(15 downto 0); - signal AUDIO_1_UNSIGNED : unsigned(15 downto 0); - signal AUDIO_2_UNSIGNED : unsigned(15 downto 0); - signal AUDIO_3_UNSIGNED : unsigned(15 downto 0); + signal AUDIO_MIXED_SIGNED : SIGNED_AUDIO_TYPE(3 downto 0); signal AUDIO_0_SIGMADELTA : std_logic; signal AUDIO_1_SIGMADELTA : std_logic; signal AUDIO_2_SIGMADELTA : std_logic; signal AUDIO_3_SIGMADELTA : std_logic; + signal SIGMADELTA_DITHER1 : std_logic_vector(15 downto 0); + signal SIGMADELTA_DITHER2 : std_logic_vector(15 downto 0); + signal SIGMADELTA_DITHER3 : std_logic_vector(15 downto 0); + signal SIGMADELTA_DITHER4 : std_logic_vector(15 downto 0); signal KEYBOARD_SCAN : std_logic_vector(5 downto 0); signal IOX_KEYBOARD_RESPONSE : std_logic_vector(1 downto 0); @@ -267,7 +269,7 @@ -- SID signal SID_CLK_ENABLE : std_logic; - signal SID_AUDIO : SID_AUDIO_TYPE(1 downto 0); + signal SID_AUDIO_SIGNED : SIGNED_AUDIO_TYPE(1 downto 0); signal SID_FLASH1_ADDR : std_logic_vector(16 downto 0); signal SID_FLASH1_ROMREQUEST : std_logic; signal SID_FLASH1_ROMREADY : std_logic; @@ -293,7 +295,7 @@ signal PSG_ENABLE_2Mhz : std_logic; signal PSG_ENABLE_1Mhz : std_logic; signal PSG_ENABLE : std_logic; - signal PSG_AUDIO : PSG_AUDIO_TYPE(1 downto 0); + signal PSG_AUDIO_UNSIGNED : UNSIGNED_AUDIO_TYPE(1 downto 0); signal PSG_CHANNEL : PSG_CHANNEL_TYPE(5 downto 0); signal PSG_CHANGED : std_logic_vector(1 downto 0); @@ -345,7 +347,8 @@ signal FANCY_ENABLE : std_logic; signal FANCY_SWITCH : std_logic; signal A4_DETECTED : std_logic; - signal GTIA_AUDIO : std_logic; + signal GTIA_AUDIO_OUT : std_logic; + signal GTIA_AUDIO_SIGNED : signed(15 downto 0); signal EXT_INT : std_logic_vector(20 downto 0); @@ -359,7 +362,7 @@ signal GTIA_ENABLE_REG : std_logic_vector(3 downto 0); signal ADC_VOLUME_REG : std_logic_vector(1 downto 0); signal SIO_DATA_VOLUME_REG : std_logic_vector(1 downto 0); - signal VERSION_LOC_REG : std_logic_vector(2 downto 0); + signal VERSION_LOC_REG : std_logic_vector(3 downto 0); signal PAL_REG : std_logic; signal DETECT_RIGHT_NEXT : std_logic; @@ -370,7 +373,7 @@ signal GTIA_ENABLE_NEXT : std_logic_vector(3 downto 0); signal ADC_VOLUME_NEXT : std_logic_vector(1 downto 0); signal SIO_DATA_VOLUME_NEXT : std_logic_vector(1 downto 0); - signal VERSION_LOC_NEXT : std_logic_vector(2 downto 0); + signal VERSION_LOC_NEXT : std_logic_vector(3 downto 0); signal PAL_NEXT : std_logic; --config infra @@ -379,7 +382,7 @@ signal CONFIG_ENABLE_NEXT: std_logic; -- SAMPLE/COVOX - signal SAMPLE_AUDIO : SAMPLE_AUDIO_TYPE(1 downto 0); + signal SAMPLE_AUDIO_SIGNED : SIGNED_AUDIO_TYPE(1 downto 0); signal SAMPLE_IRQ : std_logic; signal SAMPLE_RAM_ADDRESS : std_logic_vector(15 downto 0); signal SAMPLE_RAM_WRITE_ENABLE : std_logic; @@ -482,7 +485,7 @@ signal fir_data_address :std_logic_vector(9 downto 0); signal fir_data_ready :std_logic; - signal SIO_AUDIO : unsigned(15 downto 0); + signal SIO_AUDIO_UNSIGNED : unsigned(15 downto 0); -- paddles signal PADDLE_ADJ : std_logic_vector(7 downto 0); @@ -500,6 +503,22 @@ else return RIGHT; end if; end function min; + + function unsigned_to_signed(audio_in : unsigned(15 downto 0)) return signed is + variable ret : std_logic_vector(15 downto 0); + begin + ret(15) := not(audio_in(15)); + ret(14 downto 0) := std_logic_vector(audio_in(14 downto 0)); + return signed(ret); + end function unsigned_to_signed; + + function signed_to_unsigned(audio_in : signed(15 downto 0)) return unsigned is + variable ret : std_logic_vector(15 downto 0); + begin + ret(15) := not(audio_in(15)); + ret(14 downto 0) := std_logic_vector(audio_in(14 downto 0)); + return unsigned(ret); + end function signed_to_unsigned; BEGIN EXT <= (others=>'Z'); @@ -639,7 +658,7 @@ EXT_INT(ext_bits downto 1) <= EXT; synchronizer_gtia_audio : entity work.synchronizer - port map (clk=>clk, raw=>EXT_INT(gtia_audio_bit), sync=>GTIA_AUDIO); + port map (clk=>clk, raw=>EXT_INT(gtia_audio_bit), sync=>GTIA_AUDIO_OUT); synchronizer_fancy_enable : entity work.synchronizer port map (clk=>clk, raw=>EXT_INT(fancy_switch_bit), sync=>FANCY_SWITCH); @@ -802,10 +821,10 @@ CHANNEL_1 => CHANNEL1SUM_REG, CHANNEL_2 => CHANNEL2SUM_REG, CHANNEL_3 => CHANNEL3SUM_REG, - VOLUME_OUT_0 => POKEY_AUDIO_0, - VOLUME_OUT_1 => POKEY_AUDIO_1, - VOLUME_OUT_2 => POKEY_AUDIO_2, - VOLUME_OUT_3 => POKEY_AUDIO_3, + VOLUME_OUT_0 => POKEY_AUDIO_UNSIGNED(0), + VOLUME_OUT_1 => POKEY_AUDIO_UNSIGNED(1), + VOLUME_OUT_2 => POKEY_AUDIO_UNSIGNED(2), + VOLUME_OUT_3 => POKEY_AUDIO_UNSIGNED(3), PROFILE_ADDR => POKEY_PROFILE_ADDR, PROFILE_REQUEST => POKEY_PROFILE_REQUEST, PROFILE_READY => POKEY_PROFILE_READY, @@ -920,8 +939,8 @@ -- SID -------------------------------------------------------- sid_off : if enable_sid=0 generate - SID_AUDIO(0) <= (others=>'0'); - SID_AUDIO(1) <= (others=>'0'); + SID_AUDIO_SIGNED(0) <= to_signed(0,16); + SID_AUDIO_SIGNED(1) <= to_signed(0,16); SID_DO(0) <= (others=>'0'); SID_DO(1) <= (others=>'0'); SID_DRIVE_DO(0) <= '0'; @@ -987,7 +1006,7 @@ --POT_X => (others=>'0'), --POT_Y => (others=>'0'), --EXTFILTER_EN => '0', - AUDIO => SID_AUDIO(0), + AUDIO => SID_AUDIO_SIGNED(0), SIDTYPE => SID_FILTER1_REG(0), EXT => "0"&SID_FILTER1_REG(1), @@ -1027,7 +1046,7 @@ --POT_X => (others=>'0'), --POT_Y => (others=>'0'), --EXTFILTER_EN => '0', - AUDIO => SID_AUDIO(1), + AUDIO => SID_AUDIO_SIGNED(1), SIDTYPE => SID_FILTER2_REG(0), EXT => "0"&SID_FILTER2_REG(1), @@ -1052,8 +1071,8 @@ -- PSG -------------------------------------------------------- psg_off : if enable_psg=0 generate - PSG_AUDIO(0) <= (others=>'0'); - PSG_AUDIO(1) <= (others=>'0'); + PSG_AUDIO_UNSIGNED(0) <= to_unsigned(0,16); + PSG_AUDIO_UNSIGNED(1) <= to_unsigned(0,16); PSG_DO(0) <= (others=>'0'); PSG_DO(1) <= (others=>'0'); end generate psg_off; @@ -1166,8 +1185,8 @@ CHANNEL_MASK_1=>PSG_MIX1, --LABC:RABC CHANNEL_MASK_2=>PSG_MIX2, - AUDIO_OUT_1 => PSG_AUDIO(0), - AUDIO_OUT_2 => PSG_AUDIO(1), + AUDIO_OUT_1 => PSG_AUDIO_UNSIGNED(0), + AUDIO_OUT_2 => PSG_AUDIO_UNSIGNED(1), --PROFILE_SELECT=>PSG_PROFILESEL_REG, PROFILE_ADDR => PSG_PROFILE_ADDR, @@ -1184,8 +1203,8 @@ covox_off : if enable_covox=0 generate SAMPLE_IRQ <= '0'; SAMPLE_DO <= (others=>'0'); - SAMPLE_AUDIO(0) <= (others=>'0'); - SAMPLE_AUDIO(1) <= (others=>'0'); + SAMPLE_AUDIO_SIGNED(0) <= to_signed(0,16); + SAMPLE_AUDIO_SIGNED(1) <= to_signed(0,16); ADPCM_STEP_REQUEST <= '0'; end generate covox_off; @@ -1202,8 +1221,8 @@ ADDR => ADDR_IN(1 downto 0), DI => WRITE_DATA(7 downto 0), DO => SAMPLE_DO, - AUDIO0 => SAMPLE_AUDIO(0), - AUDIO1 => SAMPLE_AUDIO(1) + AUDIO0 => SAMPLE_AUDIO_SIGNED(0), + AUDIO1 => SAMPLE_AUDIO_SIGNED(1) ); end generate covox_on; @@ -1223,8 +1242,8 @@ ADDR => ADDR_IN(4 downto 0), DI => WRITE_DATA(7 downto 0), DO => SAMPLE_DO, - AUDIO0 => SAMPLE_AUDIO(0), - AUDIO1 => SAMPLE_AUDIO(1), + AUDIO0 => SAMPLE_AUDIO_SIGNED(0), + AUDIO1 => SAMPLE_AUDIO_SIGNED(1), IRQ => SAMPLE_IRQ, RAM_ADDR => SAMPLE_RAM_ADDRESS, @@ -1237,11 +1256,48 @@ ADPCM_STEP_VALUE => FLASH_DO_SLOW(14 downto 0) ); +packed_ram45 : if sample_ram_size=46080 generate + sample_ram_inst : entity work.m9k_grouped + GENERIC MAP + ( + NUM_GROUPS => 5, + --EXTRA_RAM_BLOCKS => 3 + EXTRA_RAM_BLOCKS => 0 + ) + PORT MAP + ( + clock => clk, + reset_n => reset_n, + data => write_data, + address => sample_ram_address, + we => sample_ram_write_enable, + q => sample_ram_data + ); +end generate; + +packed_ram64 : if sample_ram_size=65536 generate + sample_ram_inst : entity work.m9k_grouped + --GENERIC MAP + --( + -- DATA_WIDTH => 8 + --) + PORT MAP + ( + clock => clk, + reset_n => reset_n, + data => write_data, + address => sample_ram_address, + we => sample_ram_write_enable, + q => sample_ram_data + ); +end generate; + +normal_ram : if not(sample_ram_size=65536 or sample_ram_size=46080) generate sample_ram_inst : entity work.generic_ram_infer GENERIC MAP ( ADDRESS_WIDTH => 16, - SPACE => 43008, + SPACE => SAMPLE_RAM_SIZE, DATA_WIDTH => 8 ) PORT MAP @@ -1253,6 +1309,7 @@ we => sample_ram_write_enable, q => sample_ram_data ); +end generate; end generate sample_on; @@ -1347,7 +1404,7 @@ DO_MUX <= SID_DO(1); DRIVE_DO_MUX <= SID_DRIVE_DO(1); SID_WRITE_ENABLE(1) <= writereq_s; - SID_READ_ENABLE(0) <= readreq_s; + SID_READ_ENABLE(1) <= readreq_s; when "1000"|"1001" => enable_region := RESTRICT_CAPABILITY_REG(4); DO_MUX <= SAMPLE_DO; @@ -1551,7 +1608,7 @@ end if; if (addr_decoded4(4)='1') then - VERSION_LOC_NEXT <= WRITE_DATA(2 downto 0); + VERSION_LOC_NEXT <= WRITE_DATA(3 downto 0); end if; if (addr_decoded4(5)='1') then @@ -1666,6 +1723,9 @@ end if; if (enable_sample=1) then ACTUAL_CAPABILITY(5) := '1'; + if sample_ram_size=65536 then + ACTUAL_CAPABILITY(7) := '1'; + end if; else ACTUAL_CAPABILITY(5) := '0'; end if; @@ -1694,23 +1754,25 @@ if (addr_decoded4(4)='1') then -- version - case VERSION_LOC_REG(2 downto 0) is - when "000" => + case VERSION_LOC_REG(3 downto 0) is + when "0000" => CONFIG_DO <= getByte(version,1); - when "001" => + when "0001" => CONFIG_DO <= getByte(version,2); - when "010" => + when "0010" => CONFIG_DO <= getByte(version,3); - when "011" => + when "0011" => CONFIG_DO <= getByte(version,4); - when "100" => + when "0100" => CONFIG_DO <= getByte(version,5); - when "101" => + when "0101" => CONFIG_DO <= getByte(version,6); - when "110" => + when "0110" => CONFIG_DO <= getByte(version,7); - when "111" => + when "0111" => CONFIG_DO <= getByte(version,8); + when "1000" => + CONFIG_DO <= std_logic_vector(to_unsigned(board/10,4))&std_logic_vector(to_unsigned(board mod 10,4)); when others => end case; end if; @@ -1779,6 +1841,15 @@ ------------------------------------------------------- -- AUDIO mixing +process(GTIA_AUDIO_OUT) is +begin + if GTIA_AUDIO_OUT='1' then + GTIA_AUDIO_SIGNED <= to_signed(5120,16); + else + GTIA_AUDIO_SIGNED <= to_signed(-5120,16); + end if; +end process; + mixer1 : entity work.mixer PORT MAP ( @@ -1790,36 +1861,46 @@ POST_DIVIDE => POST_DIVIDE_REG, DETECT_RIGHT => DETECT_RIGHT_REG, FANCY_ENABLE => FANCY_ENABLE, - GTIA_EN => GTIA_ENABLE_REG, - ADC_EN => "1100", + B_CH0_EN => GTIA_ENABLE_REG, + B_CH1_EN => "1100", - CH0 => POKEY_AUDIO_0, - CH1 => POKEY_AUDIO_1, - CH2 => POKEY_AUDIO_2, - CH3 => POKEY_AUDIO_3, - CH4 => unsigned(SAMPLE_AUDIO(0)), - CH5 => unsigned(SAMPLE_AUDIO(1)), - CH6 => unsigned(SID_AUDIO(0)), - CH7 => unsigned(SID_AUDIO(1)), - CH8 => unsigned(PSG_AUDIO(0)), - CH9 => unsigned(PSG_AUDIO(1)), - CHA(14 downto 0) => (others=>'0'), - CHA(15) => GTIA_AUDIO, - CHB => SIO_AUDIO, + L_CH0 => unsigned_to_signed(POKEY_AUDIO_UNSIGNED(0)), + R_CH0 => unsigned_to_signed(POKEY_AUDIO_UNSIGNED(1)), + L_CH1 => unsigned_to_signed(POKEY_AUDIO_UNSIGNED(2)), + R_CH1 => unsigned_to_signed(POKEY_AUDIO_UNSIGNED(3)), + L_CH2 => SAMPLE_AUDIO_SIGNED(0), + R_CH2 => SAMPLE_AUDIO_SIGNED(1), + L_CH3 => SID_AUDIO_SIGNED(0), + R_CH3 => SID_AUDIO_SIGNED(1), + L_CH4 => unsigned_to_signed(PSG_AUDIO_UNSIGNED(0)), + R_CH4 => unsigned_to_signed(PSG_AUDIO_UNSIGNED(1)), + B_CH0 => GTIA_AUDIO_SIGNED, + B_CH1 => unsigned_to_signed(SIO_AUDIO_UNSIGNED), - AUDIO_0_UNSIGNED => AUDIO_0_UNSIGNED, - AUDIO_1_UNSIGNED => AUDIO_1_UNSIGNED, - AUDIO_2_UNSIGNED => AUDIO_2_UNSIGNED, - AUDIO_3_UNSIGNED => AUDIO_3_UNSIGNED + AUDIO_0_SIGNED => AUDIO_MIXED_SIGNED(0), + AUDIO_1_SIGNED => AUDIO_MIXED_SIGNED(1), + AUDIO_2_SIGNED => AUDIO_MIXED_SIGNED(2), + AUDIO_3_SIGNED => AUDIO_MIXED_SIGNED(3) ); +dac_dithergen : entity work.sigmadelta_dither +port map +( + reset_n => reset_n, + clk => clk, + ENABLE => ENABLE_CYCLE, + DITHER_OUT1 => SIGMADELTA_DITHER1, + DITHER_OUT2 => SIGMADELTA_DITHER2, + DITHER_OUT3 => SIGMADELTA_DITHER3, + DITHER_OUT4 => SIGMADELTA_DITHER4 +); + --approx line level by using 5V/4 -> ok 1.25V, should be ok approx dac_0 : entity work.filtered_sigmadelta --pin37 GENERIC MAP ( - IMPLEMENTATION => 4, - LOWPASS => lowpass, - LFSR_SEED => x"ACE2" + IMPLEMENTATION => sigmadelta_implementation, + LOWPASS => lowpass ) port map ( @@ -1827,7 +1908,8 @@ clk => clk, clk2 => CLK116, ENABLE_179 => ENABLE_CYCLE, - audin => AUDIO_0_UNSIGNED, + DITHER_IN => SIGMADELTA_DITHER1, + audin => signed_to_unsigned(AUDIO_MIXED_SIGNED(0)), AUDOUT => AUDIO_0_SIGMADELTA ); @@ -1836,9 +1918,8 @@ dac_1 : entity work.filtered_sigmadelta GENERIC MAP ( - IMPLEMENTATION => 4, - LOWPASS => lowpass, - LFSR_SEED => x"1D2B" + IMPLEMENTATION => sigmadelta_implementation, + LOWPASS => lowpass ) port map ( @@ -1846,7 +1927,8 @@ clk => clk, clk2 => CLK106, ENABLE_179 => ENABLE_CYCLE, - audin => AUDIO_1_UNSIGNED, + DITHER_IN => SIGMADELTA_DITHER2, + audin => signed_to_unsigned(AUDIO_MIXED_SIGNED(1)), AUDOUT => AUDIO_1_SIGMADELTA ); @@ -1859,9 +1941,8 @@ dac_2 : entity work.filtered_sigmadelta GENERIC MAP ( - IMPLEMENTATION => 4, - LOWPASS => lowpass, - LFSR_SEED => x"BEEF" + IMPLEMENTATION => sigmadelta_implementation, + LOWPASS => lowpass ) port map ( @@ -1869,7 +1950,8 @@ clk => clk, clk2 => CLK116, ENABLE_179 => ENABLE_CYCLE, - audin => AUDIO_2_UNSIGNED, + DITHER_IN => SIGMADELTA_DITHER3, + audin => signed_to_unsigned(AUDIO_MIXED_SIGNED(2)), AUDOUT => AUDIO_2_SIGMADELTA ); @@ -1876,9 +1958,8 @@ dac_3 : entity work.filtered_sigmadelta GENERIC MAP ( - IMPLEMENTATION => 4, - LOWPASS => lowpass, - LFSR_SEED => x"5A3C" + IMPLEMENTATION => sigmadelta_implementation, + LOWPASS => lowpass ) port map ( @@ -1886,7 +1967,8 @@ clk => clk, clk2 => CLK106, ENABLE_179 => ENABLE_CYCLE, - audin => AUDIO_3_UNSIGNED, + DITHER_IN => SIGMADELTA_DITHER4, + audin => signed_to_unsigned(AUDIO_MIXED_SIGNED(3)), AUDOUT => AUDIO_3_SIGMADELTA ); @@ -1897,7 +1979,7 @@ PORT MAP ( CLK => clk, - AUDIO_IN => audio_2_unsigned, + AUDIO_IN => signed_to_unsigned(AUDIO_MIXED_SIGNED(2)), SAMPLE_IN => enable_cycle, AUDIO_OUT => audio_2_filtered ); @@ -1906,7 +1988,7 @@ PORT MAP ( CLK => clk, - AUDIO_IN => audio_3_unsigned, + AUDIO_IN => signed_to_unsigned(AUDIO_MIXED_SIGNED(3)), SAMPLE_IN => enable_cycle, AUDIO_OUT => audio_3_filtered ); @@ -2104,7 +2186,7 @@ adc_out_signed <= adc_in_signed; end generate fir_off; - SIO_AUDIO <= unsigned(not(adc_use_reg(15))&adc_use_reg(14 downto 0)); + SIO_AUDIO_UNSIGNED <= unsigned(not(adc_use_reg(15))&adc_use_reg(14 downto 0)); process(adc_reg,adc_output,adc_valid,ADC_VOLUME_REG) variable adc_shrunk : signed(19 downto 0); @@ -2167,15 +2249,15 @@ adc_off : if enable_adc=0 generate process(SIO_DATA_VOLUME_REG) begin - SIO_AUDIO(15 downto 0) <= (others=>'0'); + SIO_AUDIO_UNSIGNED(15 downto 0) <= (others=>'0'); case SIO_DATA_VOLUME_REG is when "01" => - SIO_AUDIO(10) <= SIO_RXD_ADC; + SIO_AUDIO_UNSIGNED(10) <= SIO_RXD_ADC; when "10" => - SIO_AUDIO(11) <= SIO_RXD_ADC; + SIO_AUDIO_UNSIGNED(11) <= SIO_RXD_ADC; when "11" => - SIO_AUDIO(12) <= SIO_RXD_ADC; + SIO_AUDIO_UNSIGNED(12) <= SIO_RXD_ADC; when others => end case; end process; @@ -2207,12 +2289,12 @@ --1->pin37 -AUD(1) <= AUDIO_0_SIGMADELTA when CHANNEL_EN_REG(0)='1' else '0'; +AUD(1) <= AUDIO_0_SIGMADELTA when CHANNEL_EN_REG(0)='1' else '0'; --L (internal) -- ext AUD pins: -AUD(2) <= AUDIO_1_SIGMADELTA when CHANNEL_EN_REG(1)='1' else '0'; -AUD(3) <= AUDIO_2_SIGMADELTA when CHANNEL_EN_REG(2)='1' else '0'; -AUD(4) <= AUDIO_3_SIGMADELTA when CHANNEL_EN_REG(3)='1' else '0'; +AUD(2) <= AUDIO_1_SIGMADELTA when CHANNEL_EN_REG(1)='1' else '0'; --R (external version of internal, if present on board) +AUD(3) <= AUDIO_2_SIGMADELTA when CHANNEL_EN_REG(2)='1' else '0'; --L +AUD(4) <= AUDIO_3_SIGMADELTA when CHANNEL_EN_REG(3)='1' else '0'; --R IRQ <= '0' when (IRQ_EN_REG='1' and (and_reduce(POKEY_IRQ)='0')) or (IRQ_EN_REG='0' and POKEY_IRQ(0)='0') or (SAMPLE_IRQ='1') else 'Z';