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--------------------------------------------------------------------------- -- (c) 2016 Alexey Spirkov -- I am happy for anyone to use this for non-commercial use. -- If my verilog/vhdl/c files are used commercially or otherwise sold, -- please contact me for explicit permission at me _at_ alsp.net. -- This applies for source and binary form and derived works. --------------------------------------------------------------------------- -- Recommended params: -- N=0x1800 CTS=0x6FD1 (28.625MHz pixel clock -> 48KHz audio clock) -- N=0x1000 CTS=0x6FD1 (28.625MHz pixel clock -> 32KHz audio clock) -- N=0x1000 CTS=0x6978 (27MHz pixel clock -> 32KHz audio clock) -- N=0x1800 CTS=0x6978 (27MHz pixel clock -> 48KHz audio clock) --------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity av_hdmi is generic ( FREQ: integer := 27000000; -- pixel clock frequency FS: integer := 48000; -- audio sample rate - should be 32000, 41000 or 48000 CTS: integer := 27000; -- CTS = Freq(pixclk) * N / (128 * Fs) N: integer := 6144 -- N = 128 * Fs /1000, 128 * Fs /1500 <= N <= 128 * Fs /300 -- Check HDMI spec 7.2 for details ); port ( -- clocks I_CLK_PIXEL_x5 : in std_logic; I_CLK_PIXEL : in std_logic; -- components I_R : in std_logic_vector(7 downto 0); I_G : in std_logic_vector(7 downto 0); I_B : in std_logic_vector(7 downto 0); I_BLANK : in std_logic; I_HSYNC : in std_logic; I_VSYNC : in std_logic; -- PCM audio I_AUDIO_PCM_L : in std_logic_vector(15 downto 0); I_AUDIO_PCM_R : in std_logic_vector(15 downto 0); -- TMDS output O_TMDS_D0 : out std_logic; O_TMDS_D1 : out std_logic; O_TMDS_D2 : out std_logic; O_TMDS_CLK : out std_logic); end entity;
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HDMI Audio/Video signal generation for HW emulators of retro comuters
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