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MacPlus_MiSTer/sys/pll_hdmi_adj.vhd
sorgelig b04c6c7eec Update sys.
2019-07-12 06:22:16 +08:00

434 lines
12 KiB
VHDL
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--------------------------------------------------------------------------------
-- HDMI PLL Adjust
--------------------------------------------------------------------------------
-- Changes the HDMI PLL frequency according to the scaler suggestions.
--------------------------------------------
-- LLTUNE :
-- 0 : Input Display Enable
-- 1 : Input Vsync
-- 2 : Input Interlaced mode
-- 3 : Input Interlaced field
-- 4 : Output Image frame
-- 5 :
-- 6 : Input clock
-- 7 : Output clock
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
ENTITY pll_hdmi_adj IS
PORT (
-- Scaler
llena : IN std_logic; -- 0=Disabled 1=Enabled
lltune : IN unsigned(15 DOWNTO 0); -- Outputs from scaler
locked : OUT std_logic;
-- Signals from reconfig commands
i_waitrequest : OUT std_logic;
i_write : IN std_logic;
i_address : IN unsigned(5 DOWNTO 0);
i_writedata : IN unsigned(31 DOWNTO 0);
-- Outputs to PLL_HDMI_CFG
o_waitrequest : IN std_logic;
o_write : OUT std_logic;
o_address : OUT unsigned(5 DOWNTO 0);
o_writedata : OUT unsigned(31 DOWNTO 0);
------------------------------------
clk : IN std_logic;
reset_na : IN std_logic
);
BEGIN
END ENTITY pll_hdmi_adj;
--##############################################################################
ARCHITECTURE rtl OF pll_hdmi_adj IS
SIGNAL i_clk,i_de,i_de2,i_vss,i_vss2,i_vss_delay,i_ce : std_logic;
SIGNAL i_linecpt,i_line : natural RANGE 0 TO 2**12-1;
SIGNAL i_delay : natural RANGE 0 TO 2**14-1;
SIGNAL pwrite : std_logic;
SIGNAL paddress : unsigned(5 DOWNTO 0);
SIGNAL pdata : unsigned(31 DOWNTO 0);
TYPE enum_state IS (sIDLE,sW1,sW2,sW3,sW4,sW5,sW6);
SIGNAL state : enum_state;
SIGNAL tune_freq,tune_phase : unsigned(5 DOWNTO 0);
SIGNAL lltune_sync,lltune_sync2,lltune_sync3 : unsigned(15 DOWNTO 0);
SIGNAL mfrac,mfrac_mem,mfrac_ref,diff : unsigned(40 DOWNTO 0);
SIGNAL mul : unsigned(15 DOWNTO 0);
SIGNAL sign,sign_pre : std_logic;
SIGNAL expand : boolean;
SIGNAL up,modo,phm,dir : std_logic;
SIGNAL cpt : natural RANGE 0 TO 3;
SIGNAL col : natural RANGE 0 TO 15;
SIGNAL icpt,ocpt,o2cpt,ssh,ofsize,ifsize : natural RANGE 0 TO 2**24-1;
SIGNAL ivss,ivss2,itog : std_logic;
SIGNAL ovss,ovss2,otog : std_logic;
SIGNAL sync,pulse,los,lop : std_logic;
SIGNAL osize,offset,osizep,offsetp : signed(23 DOWNTO 0);
SIGNAL logcpt : natural RANGE 0 TO 31;
SIGNAL udiff : integer RANGE -2**23 TO 2**23-1 :=0;
BEGIN
----------------------------------------------------------------------------
-- 4 lines delay to input
i_vss<=lltune(0);
i_de <=lltune(1);
i_ce <=lltune(5);
i_clk<=lltune(6);
Delay:PROCESS(i_clk) IS
BEGIN
IF rising_edge(i_clk) THEN
IF i_ce='1' THEN
-- Measure input line time.
i_de2<=i_de;
IF i_de='1' AND i_de2='0' THEN
i_linecpt<=0;
IF i_vss='1' THEN
i_line<=i_linecpt;
END IF;
ELSE
i_linecpt<=i_linecpt+1;
END IF;
-- Delay 4 lines
i_vss2<=i_vss;
IF i_vss/=i_vss2 THEN
i_delay<=0;
ELSIF i_delay=i_line * 4 THEN
i_vss_delay<=i_vss;
ELSE
i_delay<=i_delay+1;
END IF;
END IF;
END IF;
END PROCESS Delay;
----------------------------------------------------------------------------
-- Sample image sizes
Sampler:PROCESS(clk,reset_na) IS
BEGIN
IF reset_na='0' THEN
--pragma synthesis_off
otog<='0';
itog<='0';
ivss<='0';
ivss2<='0';
ovss<='0';
ovss2<='0';
--pragma synthesis_on
ELSIF rising_edge(clk) THEN
-- Clock domain crossing
ivss<=i_vss_delay; -- <ASYNC>
ivss2<=ivss;
ovss<=lltune(4); -- <ASYNC>
ovss2<=ovss;
otog<=otog XOR (ovss AND NOT ovss2);
-- Measure output frame time
IF ovss='1' AND ovss2='0' AND otog='1' THEN
ocpt<=0;
osizep<=to_signed(ocpt,24);
ELSE
ocpt<=ocpt+1;
END IF;
IF ovss='0' AND ovss2='1' AND otog='0' THEN
o2cpt<=0;
ELSE
o2cpt<=o2cpt+1;
END IF;
-- Measure output image time
IF ovss='0' AND ovss2='1' AND otog='0' THEN
ofsize<=ocpt;
END IF;
itog<=itog XOR (ivss AND NOT ivss2);
-- Measure input frame time
IF ivss='1' AND ivss2='0' AND itog='1' THEN
icpt<=0;
osize<=osizep;
udiff<=integer(to_integer(osizep)) - integer(icpt);
sync<='1';
ELSE
icpt<=icpt+1;
sync<='0';
END IF;
-- Measure input image time
IF ivss='0' AND ivss2='1' AND itog='0' THEN
ifsize<=icpt;
END IF;
expand<=(ofsize>=ifsize);
-- IN | ######### | EXPAND = 1
-- OUT | ############# |
-- IN | ######### | EXPAND = 0
-- OUT | ###### |
IF expand THEN
IF ivss='1' AND ivss2='0' AND itog='1' THEN
offset<=to_signed(ocpt,24);
END IF;
ELSE
IF ivss='0' AND ivss2='1' AND itog='0' THEN
offset<=to_signed(o2cpt,24);
END IF;
END IF;
--------------------------------------------
pulse<='0';
IF sync='1' THEN
logcpt<=0;
ssh<=to_integer(osize);
los<='0';
lop<='0';
ELSIF logcpt<24 THEN
-- Frequency difference
IF udiff>0 AND ssh<udiff AND los='0' THEN
tune_freq<='0' & to_unsigned(logcpt,5);
los<='1';
ELSIF udiff<=0 AND ssh<-udiff AND los='0' THEN
tune_freq<='1' & to_unsigned(logcpt,5);
los<='1';
END IF;
-- Phase difference
IF offset<osize/2 AND ssh<offset AND lop='0' THEN
tune_phase<='0' & to_unsigned(logcpt,5);
lop<='1';
ELSIF offset>=osize/2 AND ssh<(osize-offset) AND lop='0' THEN
tune_phase<='1' & to_unsigned(logcpt,5);
lop<='1';
END IF;
ssh<=ssh/2;
logcpt<=logcpt+1;
ELSIF logcpt=24 THEN
pulse<='1';
ssh<=ssh/2;
logcpt<=logcpt+1;
END IF;
END IF;
END PROCESS Sampler;
----------------------------------------------------------------------------
-- 000010 : Start reg "Write either 0 or 1 to start fractional PLL reconf.
-- 000100 : M counter
-- 000111 : M counter Fractional Value K
Comb:PROCESS(i_write,i_address,
i_writedata,pwrite,paddress,pdata) IS
BEGIN
IF i_write='1' THEN
o_write <=i_write;
o_address <=i_address;
o_writedata <=i_writedata;
ELSE
o_write <=pwrite;
o_address <=paddress;
o_writedata<=pdata;
END IF;
END PROCESS Comb;
i_waitrequest<=o_waitrequest WHEN state=sIDLE ELSE '0';
----------------------------------------------------------------------------
Schmurtz:PROCESS(clk,reset_na) IS
VARIABLE off_v,ofp_v : natural RANGE 0 TO 63;
VARIABLE diff_v : unsigned(40 DOWNTO 0);
VARIABLE mulco : unsigned(15 DOWNTO 0);
VARIABLE up_v,sign_v : std_logic;
BEGIN
IF reset_na='0' THEN
modo<='0';
state<=sIDLE;
ELSIF rising_edge(clk) THEN
------------------------------------------------------
-- Snoop accesses to PLL reconfiguration
IF i_address="000100" AND i_write='1' THEN
mfrac (40 DOWNTO 32)<=('0' & i_writedata(15 DOWNTO 8)) +
('0' & i_writedata(7 DOWNTO 0));
mfrac_ref(40 DOWNTO 32)<=('0' & i_writedata(15 DOWNTO 8)) +
('0' & i_writedata(7 DOWNTO 0));
mfrac_mem(40 DOWNTO 32)<=('0' & i_writedata(15 DOWNTO 8)) +
('0' & i_writedata(7 DOWNTO 0));
mul<=i_writedata(15 DOWNTO 0);
modo<='1';
END IF;
IF i_address="000111" AND i_write='1' THEN
mfrac (31 DOWNTO 0)<=i_writedata;
mfrac_ref(31 DOWNTO 0)<=i_writedata;
mfrac_mem(31 DOWNTO 0)<=i_writedata;
modo<='1';
END IF;
------------------------------------------------------
-- Tuning
off_v:=to_integer('0' & tune_freq(4 DOWNTO 0));
ofp_v:=to_integer('0' & tune_phase(4 DOWNTO 0));
--IF off_v<8 THEN off_v:=8; END IF;
--IF ofp_v<7 THEN ofp_v:=7; END IF;
IF off_v<4 THEN off_v:=4; END IF;
IF ofp_v<4 THEN ofp_v:=4; END IF;
IF off_v>=18 AND ofp_v>=18 THEN
locked<=llena;
ELSE
locked<='0';
END IF;
up_v:='0';
IF pulse='1' THEN
cpt<=(cpt+1) MOD 4;
IF llena='0' THEN
-- Recover original freq when disabling low lag mode
cpt<=0;
col<=0;
IF modo='1' THEN
mfrac<=mfrac_mem;
mfrac_ref<=mfrac_mem;
up<='1';
modo<='0';
END IF;
ELSIF phm='0' AND cpt=0 THEN
-- Frequency adjust
sign_v:=tune_freq(5);
IF col<10 THEN col<=col+1; END IF;
IF off_v>=16 AND col>=10 THEN
phm<='1';
col<=0;
ELSE
off_v:=off_v+1;
IF off_v>17 THEN
off_v:=off_v + 3;
END IF;
up_v:='1';
up<='1';
END IF;
ELSIF cpt=0 THEN
-- Phase adjust
sign_v:=NOT tune_phase(5);
col<=col+1;
IF col>=10 THEN
phm<='0';
up_v:='1';
off_v:=31;
col<=0;
ELSE
off_v:=ofp_v + 1;
IF ofp_v>7 THEN
off_v:=off_v + 1;
END IF;
IF ofp_v>14 THEN
off_v:=off_v + 2;
END IF;
IF ofp_v>17 THEN
off_v:=off_v + 3;
END IF;
up_v:='1';
END IF;
up<='1';
END IF;
END IF;
diff_v:=shift_right(mfrac_ref,off_v);
IF sign_v='0' THEN
diff_v:=mfrac_ref + diff_v;
ELSE
diff_v:=mfrac_ref - diff_v;
END IF;
IF up_v='1' THEN
mfrac<=diff_v;
END IF;
IF up_v='1' AND phm='0' THEN
mfrac_ref<=diff_v;
END IF;
------------------------------------------------------
-- Update PLL registers
mulco:=mfrac(40 DOWNTO 33) & (mfrac(40 DOWNTO 33) + ('0' & mfrac(32)));
CASE state IS
WHEN sIDLE =>
pwrite<='0';
IF up='1' THEN
up<='0';
IF mulco/=mul THEN
state<=sW1;
ELSE
state<=sW3;
END IF;
END IF;
WHEN sW1 => -- Change M multiplier
mul<=mulco;
pdata<=x"0000" & mulco;
paddress<="000100";
pwrite<='1';
state<=sW2;
WHEN sW2 =>
IF pwrite='1' AND o_waitrequest='0' THEN
state<=sW3;
pwrite<='0';
END IF;
WHEN sW3 => -- Change M fractional value
pdata<=mfrac(31 DOWNTO 0);
paddress<="000111";
pwrite<='1';
state<=sW4;
WHEN sW4 =>
IF pwrite='1' AND o_waitrequest='0' THEN
state<=sW5;
pwrite<='0';
END IF;
WHEN sW5 =>
pdata<=x"0000_0001";
paddress<="000010";
pwrite<='1';
state<=sW6;
WHEN sW6 =>
IF pwrite='1' AND o_waitrequest='0' THEN
pwrite<='0';
state<=sIDLE;
END IF;
END CASE;
END IF;
END PROCESS Schmurtz;
----------------------------------------------------------------------------
END ARCHITECTURE rtl;
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