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Code Issues Releases Wiki Activity

Fix bidirectional port handling of YM2149

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This commit is contained in:
Till Harbaum
2018-10-17 21:10:47 +02:00
parent b226035e35
commit 958c9291d7
1 changed files with 4 additions and 3 deletions
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7
cores/mist/YM2149_volmix.vhd
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@@ -260,12 +260,13 @@ begin
when x"E" => if (reg(7)(6) = '0') then -- input
O_DA <= ioa_inreg;
else
O_DA <= reg(14); -- read output reg
-- outputs have pullups and can still be driven low externally
O_DA <= reg(14) AND ioa_inreg; -- read output reg
end if;
when x"F" => if (reg(7)(7) = '0') then
O_DA <= iob_inreg;
else
O_DA <= reg(15);
O_DA <= reg(15) AND iob_inreg;
end if;
when others => null;
end case;
@@ -529,7 +530,7 @@ begin
vol_table_in_r(11 downto 8) <= reg(10)(3 downto 0);
else
vol_table_in_l(11 downto 8) <= env_vol(4 downto 1);
vol_table_in_r(11 downto 8) <= env_vol(4 downto 1);
vol_table_in_r(11 downto 8) <= reg(10)(3 downto 0);
end if;
end if;
end if;