1 files changed, 36 insertions, 0 deletions
diff --git a/basys3/basys3.srcs/apu.vhd b/basys3/basys3.srcs/apu.vhd
new file mode 100644
index 0000000..ea2a342
--- /dev/null
+++ b/basys3/basys3.srcs/apu.vhd
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+library ieee;
+use ieee.std_logic_1164.all;
+--use ieee.numeric_std.all;
+
+entity apu is
+	port(
+		CLK100: in std_logic; -- system clock
+		RESET: in std_logic; -- global (async) system reset
+		DATA: in std_logic_vector(15 downto 0);
+        SOUND: out std_logic);
+
+		-- EN: in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
+		-- WEN: in std_logic; -- PPU VRAM write enable
+		-- ADDR: in std_logic_vector(15 downto 0); -- PPU VRAM ADDR
+		-- R,G,B: out std_logic_vector(3 downto 0);
+		-- NVSYNC, NHSYNC: out std_logic; -- native VGA out
+		-- TVSYNC, TVBLANK, THSYNC, THBLANK: out std_logic); -- tiny VGA out
+end apu;
+
+architecture Behavioral of apu is
+
+	component apu_note_to_frequency port (
+			data : in std_logic_vector(7 downto 0);
+			freq : out std_logic_vector(7 downto 0) --frequency
+		);
+	end component;
+	component apu_LUT_reader port (
+			clk   : in std_logic;
+			rst : in std_logic;
+			wave : in std_logic_vector(1 downto 0);
+			level : out std_logic_vector(7 downto 0)
+		);
+	end component;
+
+begin
+end architecture;
+\ No newline at end of file