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RGBtoHDMI
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Atom CPLD: Send two 4-bit pixels per psync edge 

Change-Id: I585ee6b74a69405dcbd1ce13e38eadc792a16048
pull/11/head
David Banks 2018-11-27 16:02:34 +00:00
rodzic 20465e78fc
commit a40367459c
2 zmienionych plików z 46 dodań i 33 usunięć
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68
vhdl_atom/RGBtoHDMI.vhdl
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@ -61,11 +61,12 @@ architecture Behavorial of RGBtoHDMI is
constant atom_clamp_end : unsigned(8 downto 0) := to_unsigned(512 - 255 + 248, 9);
-- Sampling points
constant INIT_SAMPLING_POINTS : std_logic_vector(3 downto 0) := "0010";
constant INIT_SAMPLING_POINTS : std_logic_vector(3 downto 0) := "0000";
signal shift_R : std_logic_vector(3 downto 0);
signal shift_G : std_logic_vector(3 downto 0);
signal shift_B : std_logic_vector(3 downto 0);
signal shift_R : std_logic_vector(1 downto 0);
signal shift_G1 : std_logic_vector(1 downto 0);
signal shift_G2 : std_logic_vector(1 downto 0);
signal shift_B : std_logic_vector(1 downto 0);
-- The sampling counter runs at 8x pixel clock of 7.15909MHz = 56.272720MHz
--
@ -86,13 +87,13 @@ architecture Behavorial of RGBtoHDMI is
signal offset : unsigned (3 downto 0);
-- Sample pixel on next clock; pipelined to reduce the number of product terms
signal shift : std_logic;
signal sample_C : std_logic;
signal sample_L : std_logic;
signal sample_C : std_logic;
signal sample_L : std_logic;
-- Decoded RGB signals
signal R : std_logic;
signal G : std_logic;
signal G1 : std_logic;
signal G2 : std_logic;
signal B : std_logic;
-- R/PA/PB processing pipeline
@ -126,7 +127,7 @@ architecture Behavorial of RGBtoHDMI is
begin
offset <= unsigned(sp_reg(3 downto 0));
offset <= unsigned(sp_reg(3 downto 0));
-- Shift the bits in LSB first
process(sp_clk)
@ -169,13 +170,6 @@ begin
sample_C <= '0';
end if;
-- shift
if counter(1 downto 0) = offset(1 downto 0) then
shift <= '1';
else
shift <= '0';
end if;
-- Atom pixel processing
AL1 <= AL_I;
AH1 <= AH_I;
@ -195,7 +189,7 @@ begin
L1 <= L_I;
L2 <= L1;
L3 <= L2;
if sample_C = '1' then
AL <= (AL1 AND AL2) OR (AL1 AND AL3) OR (AL2 AND AL3);
AH <= (AH1 AND AH2) OR (AH1 AND AH3) OR (AH2 AND AH3);
@ -225,7 +219,13 @@ begin
--BUFF 1.5 1.5 0 0 0 0 1 1 1 1 1
--ORANGE 2.0 1.0 0 1 1 0 1 1 1 0 0
G <= (NOT AL AND NOT AH AND BL AND NOT BH) OR (AL AND NOT AH AND NOT BL AND NOT BH) OR (AL AND NOT AH AND BL AND NOT BH AND L) OR (NOT AL AND NOT AH AND NOT BL AND NOT BH AND L) OR (NOT AL AND AH AND BL AND NOT BH AND L);
G1 <= (NOT AL AND NOT AH AND BL AND NOT BH) OR (AL AND NOT AH AND NOT BL AND NOT BH) OR (AL AND NOT AH AND BL AND NOT BH AND L) OR (NOT AL AND NOT AH AND NOT BL AND NOT BH AND L) OR (NOT AL AND AH AND BL AND NOT BH AND L);
-- AL AH BL BH L R G1 G2 B
--ORANGE 2.0 1.0 0 1 1 0 1 1 1 0 0
-- Note: invert this, so orange appears in colours 8..15
G2 <= (NOT AL AND AH AND BL AND NOT BH AND L);
-- AL AH BL BH L R G1 G2 B
--BLUE 1.5 2.0 0 0 0 1 X 0 0 1 1
@ -237,13 +237,15 @@ begin
end if;
if shift = '1' and counter(counter'left) = '0' then
if sample_L = '1' and counter(counter'left) = '0' then
-- R Sample/shift register
shift_R <= R & shift_R(3 downto 1);
-- G Sample/shift register
shift_G <= G & shift_G(3 downto 1);
shift_R <= R & shift_R(1);
-- G1 Sample/shift register
shift_G1 <= G1 & shift_G1(1);
-- G2 Sample/shift register
shift_G2 <= G2 & shift_G2(1);
-- B Sample/shift register
shift_B <= B & shift_B(3 downto 1);
shift_B <= B & shift_B(1);
end if;
-- Output quad register
@ -252,17 +254,17 @@ begin
psync <= '0';
elsif counter(counter'left) = '0' then
if counter(3 downto 0) = "0000" then
quad(11) <= shift_B(3);
quad(10) <= shift_G(3);
quad(9) <= shift_R(3);
quad(8) <= shift_B(2);
quad(7) <= shift_G(2);
quad(6) <= shift_R(2);
quad(5) <= shift_B(1);
quad(4) <= shift_G(1);
quad(3) <= shift_R(1);
quad(11) <= '0';
quad(10) <= '0';
quad(9) <= '0';
quad(8) <= '0';
quad(7) <= shift_G2(1);
quad(6) <= shift_B(1);
quad(5) <= shift_G1(1);
quad(4) <= shift_R(1);
quad(3) <= shift_G2(0);
quad(2) <= shift_B(0);
quad(1) <= shift_G(0);
quad(1) <= shift_G1(0);
quad(0) <= shift_R(0);
psync <= counter(4);
end if;

11
vhdl_atom/fitting.notes
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@ -74,3 +74,14 @@ FB3 18/18* 30/54 69/90 8/ 9
FB4 18/18* 28/54 39/90 7/ 7*
----- ----- ----- -----
69/72 111/216 189/360 27/34
8. Atom CPLD: Send two 4-bit pixels per psync edge
Function Mcells FB Inps Pterms IO
Block Used/Tot Used/Tot Used/Tot Used/Tot
FB1 18/18* 27/54 46/90 8/ 9
FB2 11/18 20/54 21/90 4/ 9
FB3 18/18* 28/54 63/90 8/ 9
FB4 18/18* 27/54 36/90 7/ 7*
----- ----- ----- -----
65/72 102/216 166/360 27/34