Revision 1345
Added by markw almost 4 years ago
| atari_chips/pokeyv2/SID/preFilterSum.vhdl | ||
|---|---|---|
|
signal channel_sel : std_logic_vector(2 downto 0);
|
||
|
|
||
|
function logic_to_unsigned(a : std_logic; b : integer) return unsigned is
|
||
|
variable ret : unsigned(2 downto 0);
|
||
|
variable ret : unsigned(3 downto 0);
|
||
|
begin
|
||
|
ret(2 downto 0) := (others=>'0');
|
||
|
ret(3 downto 0) := (others=>'0');
|
||
|
ret(b) := a;
|
||
|
return ret;
|
||
|
end function logic_to_unsigned;
|
||
| ... | ... | |
|
|
||
|
variable adder_result : signed(17 downto 0);
|
||
|
|
||
|
variable bias : unsigned(2 downto 0);
|
||
|
variable bias : unsigned(3 downto 0);
|
||
|
begin
|
||
|
prefilter_next <= prefilter_reg;
|
||
|
direct_next <= direct_reg;
|
||
| ... | ... | |
|
logic_to_unsigned(not(filter_en(0)) and bias_channel,0) +
|
||
|
logic_to_unsigned(not(filter_en(1)) and bias_channel,0) +
|
||
|
logic_to_unsigned(not(filter_en2cd_ext(0)) and bias_channel,0);
|
||
|
acc_next(16 downto 14) <= signed(std_logic_vector(bias));
|
||
|
acc_next(16 downto 13) <= signed(std_logic_vector(bias));
|
||
|
when "100" =>
|
||
|
channel_sel <= "001" and not(filter_en0_ext);
|
||
|
when "101" =>
|
||
| ... | ... | |
|
logic_to_unsigned(filter_en(0) and bias_channel,0) +
|
||
|
logic_to_unsigned(filter_en(1) and bias_channel,0) +
|
||
|
logic_to_unsigned(filter_en(2) and bias_channel,0);
|
||
|
acc_next(16 downto 14) <= signed(std_logic_vector(bias));
|
||
|
acc_next(16 downto 13) <= signed(std_logic_vector(bias));
|
||
|
when others =>
|
||
|
end case;
|
||
|
|
||
Also available in: Unified diff
Cut 6581 bias, distortion head on basil!