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ossc/rtl/scanconverter.v
paulb-nl f276cda190 Add support for GBI 360p
2018-10-13 17:33:10 +02:00

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//
// Copyright (C) 2015-2018 Markus Hiienkari <mhiienka@niksula.hut.fi>
//
// This file is part of Open Source Scan Converter project.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
`include "lat_tester_includes.v"
`define TRUE 1'b1
`define FALSE 1'b0
`define HI 1'b1
`define LO 1'b0
`define HSYNC_POL `LO
`define VSYNC_POL `LO
`define V_MULTMODE_1X 3'd0
`define V_MULTMODE_2X 3'd1
`define V_MULTMODE_3X 3'd2
`define V_MULTMODE_4X 3'd3
`define V_MULTMODE_5X 3'd4
`define PCLK_MUX_1X 3'd0
`define PCLK_MUX_2X 3'd1
`define PCLK_MUX_3X 3'd2
`define PCLK_MUX_4X 3'd3
`define PCLK_MUX_5X 3'd4
`define H_MULTMODE_FULLWIDTH 2'h0
`define H_MULTMODE_ASPECTFIX 2'h1
`define H_MULTMODE_OPTIMIZED 2'h2
`define H_MULTMODE_OPTIMIZED_1X 2'h3
`define SCANLINES_OFF 2'h0
`define SCANLINES_H 2'h1
`define SCANLINES_V 2'h2
`define SCANLINES_ALT 2'h3
`define SCANLINES_HYBR_CONTR_LOW 2'h1
`define SCANLINES_HYBR_CONTR_MED 2'h2
`define SCANLINES_HYBR_CONTR_HIGH 2'h3
`define VSYNCGEN_LEN 6
`define VSYNCGEN_GENMID_BIT 0
`define VSYNCGEN_CHOPMID_BIT 1
`define FID_EVEN 1'b0
`define FID_ODD 1'b1
`define MIN_VALID_LINES 256 //power of 2 optimization -> ignore lower bits with comparison
`define DBLFRAME_THOLD 5
`define FALSE_FIELD (fpga_vsyncgen[`VSYNCGEN_CHOPMID_BIT] & (FID_in == `FID_ODD))
`define HSYNC_LEADING_EDGE ((HSYNC_in_L == `HI) & (HSYNC_in == `LO))
`define VSYNC_LEADING_EDGE ((VSYNC_in_L == `HI) & (VSYNC_in == `LO))
//`define PP_RLPF_PL_START_EARLY // set if start with 2
`define PP_RLPF_PL_START 3 // minimum 2
`define PP_RLPF_PL_LENGTH 3 // counted from aquisition
`define PP_SLGEN_PL_LENGTH 5
`define PP_LT_BORDER_GEN_LENGTH 1 // lt_box / border_mask gen
`define PP_RLPF_PL_END (`PP_RLPF_PL_START+`PP_RLPF_PL_LENGTH)
`define PP_SLGEN_PL_END (`PP_RLPF_PL_END+`PP_SLGEN_PL_LENGTH)
`define PP_PIPELINE_LENGTH (`PP_SLGEN_PL_END+`PP_LT_BORDER_GEN_LENGTH-1'b1)
module scanconverter (
input reset_n,
input [7:0] R_in,
input [7:0] G_in,
input [7:0] B_in,
input FID_in,
input VSYNC_in,
input HSYNC_in,
input PCLK_in,
input clk27,
input [31:0] h_info,
input [31:0] h_info2,
input [31:0] v_info,
input [31:0] extra_info,
output reg [7:0] R_out,
output reg [7:0] G_out,
output reg [7:0] B_out,
output reg HSYNC_out,
output reg VSYNC_out,
output PCLK_out,
output reg DE_out,
output h_unstable,
output reg [1:0] fpga_vsyncgen,
output [1:0] pclk_lock,
output [1:0] pll_lock_lost,
output reg [10:0] vmax,
output reg [10:0] vmax_tvp,
output reg [19:0] pcnt_frame,
output ilace_flag,
input lt_active,
input [1:0] lt_mode
);
//clock-related signals
wire pclk_act;
wire pclk_1x, pclk_2x, pclk_3x, pclk_4x, pclk_5x;
wire pclk_2x_lock, pclk_3x_lock;
wire [2:0] pclk_mux_sel;
//RGB signals&registers: 8 bits per component -> 16.7M colors
wire [7:0] R_act, G_act, B_act;
wire [7:0] R_lbuf, G_lbuf, B_lbuf;
reg [7:0] R_in_L, G_in_L, B_in_L, R_in_LL, G_in_LL, B_in_LL, R_1x, G_1x, B_1x;
//H+V syncs + data enable signals&registers
wire HSYNC_act, VSYNC_act, DE_act;
reg HSYNC_in_L, VSYNC_in_L;
reg HSYNC_1x, HSYNC_2x, HSYNC_3x, HSYNC_4x, HSYNC_5x;
reg VSYNC_1x, VSYNC_2x, VSYNC_3x, VSYNC_4x, VSYNC_5x;
reg DE_1x, DE_2x, DE_3x, DE_4x, DE_5x, DE_3x_prev4x;
//registers indicating line/frame change and field type
reg FID_cur, FID_last, FID_prev, FID_1x;
reg frame_change, frame_change_longpulse, line_change;
//H+V counters
wire [11:0] linebuf_hoffset; //Offset for line (max. 2047 pixels), MSB indicates which line is read/written
wire [11:0] hcnt_act;
reg [11:0] hcnt_1x, hcnt_2x, hcnt_3x, hcnt_4x, hcnt_5x, hcnt_4x_aspfix, hcnt_2x_opt, hcnt_3x_opt, hcnt_4x_opt, hcnt_5x_opt, hcnt_5x_hscomp;
reg [2:0] hcnt_2x_opt_ctr, hcnt_3x_opt_ctr, hcnt_4x_opt_ctr, hcnt_5x_opt_ctr;
wire [10:0] vcnt_act;
reg [10:0] vcnt_tvp, vcnt_1x, vcnt_2x, vcnt_3x, vcnt_4x, vcnt_5x; //max. 2047
//other counters
wire [2:0] line_id_act, col_id_act;
reg [11:0] hmax[0:1];
reg line_idx;
reg [1:0] line_out_idx_2x, line_out_idx_3x, line_out_idx_4x;
reg [2:0] line_out_idx_5x;
reg [23:0] warn_h_unstable, warn_pll_lock_lost, warn_pll_lock_lost_3x;
// post-processing pipeline
reg HSYNC_pp[1:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
reg VSYNC_pp[1:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
reg DE_pp[1:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
reg [7:0] R_pp[3:`PP_PIPELINE_LENGTH], G_pp[3:`PP_PIPELINE_LENGTH], B_pp[3:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
reg [11:0] hcnt_pp /* synthesis ramstyle = "logic" */;
reg [10:0] vcnt_pp /* synthesis ramstyle = "logic" */;
reg rlpf_trigger_r[1:`PP_RLPF_PL_START-1] /* synthesis ramstyle = "logic" */;
reg [7:0] R_prev_pp[`PP_RLPF_PL_START:`PP_RLPF_PL_END-1], G_prev_pp[`PP_RLPF_PL_START:`PP_RLPF_PL_END-1], B_prev_pp[`PP_RLPF_PL_START:`PP_RLPF_PL_END-1] /* synthesis ramstyle = "logic" */;
reg [2:0] line_id_pp[1:`PP_SLGEN_PL_END-2], col_id_pp[1:`PP_SLGEN_PL_END-2] /* synthesis ramstyle = "logic" */;
reg border_enable_pp[2:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
reg lt_box_enable_pp[2:`PP_PIPELINE_LENGTH] /* synthesis ramstyle = "logic" */;
//helper registers for sampling at synchronized clock edges
reg pclk_1x_prev3x;
reg [1:0] pclk_3x_cnt;
reg pclk_1x_prev4x;
reg [1:0] pclk_4x_cnt;
reg pclk_1x_prev5x;
reg pclk_1x_prevprev5x;
reg [2:0] pclk_5x_cnt;
//configuration registers
reg [10:0] H_ACTIVE; //max. 2047
reg [9:0] H_AVIDSTART; //max. 1023
reg [10:0] V_ACTIVE; //max. 2047
reg [6:0] V_AVIDSTART; //max. 127
reg [7:0] H_SYNCLEN;
reg [2:0] V_SYNCLEN;
reg [1:0] V_SCANLINEMODE;
reg [4:0] V_SCANLINEID;
reg [5:0] V_MASK;
reg [2:0] V_MULTMODE;
reg [1:0] H_MULTMODE;
reg [10:0] H_MASK;
reg [9:0] H_OPT_STARTOFF;
reg [2:0] H_OPT_SCALE;
reg [2:0] H_OPT_SAMPLE_MULT;
reg [2:0] H_OPT_SAMPLE_SEL;
reg [9:0] H_L5BORDER;
reg [9:0] H_L3BORDER;
reg [6:0] H_L3_OPT_SAMPLE_COMP;
reg [3:0] X_MASK_BR;
reg X_SCANLINE_METHOD;
reg [4:0] X_SCANLINE_HYBRSTR;
reg [7:0] X_SCANLINESTR;
reg [5:0] X_REV_LPF_STR;
reg X_REV_LPF_ENABLE;
// constants for each frame to be calculated off config-registers
reg CALC_CONSTS;
reg [11:0] H_AVIDSTOP;
reg [10:0] V_AVIDSTOP;
reg [10:0] H_AVIDMASK_START;
reg [11:0] H_AVIDMASK_STOP;
reg [7:0] V_AVIDMASK_START;
reg [10:0] V_AVIDMASK_STOP;
reg [11:0] LT_POS_TOPLEFT_BOX_H_STOP;
reg [10:0] LT_POS_TOPLEFT_BOX_V_STOP;
reg [11:0] LT_POS_CENTER_BOX_H_START;
reg [11:0] LT_POS_CENTER_BOX_H_STOP;
reg [10:0] LT_POS_CENTER_BOX_V_START;
reg [10:0] LT_POS_CENTER_BOX_V_STOP;
reg [11:0] LT_POS_BOTTOMRIGHT_H_START;
reg [10:0] LT_POS_BOTTOMRIGHT_V_START;
//clk27 related registers
reg VSYNC_in_cc_L, VSYNC_in_cc_LL, VSYNC_in_cc_LLL;
reg [21:0] clk27_ctr; // min. 6.5Hz
reg [2:0] dbl_frame_ctr;
reg frame_change_longpulse_cc_L, frame_change_longpulse_cc_LL, frame_change_longpulse_cc_LLL;
reg [19:0] pcnt_ctr;
assign pclk_1x = PCLK_in;
assign PCLK_out = pclk_act;
assign pclk_lock = {pclk_2x_lock, pclk_3x_lock};
assign ilace_flag = (FID_cur != FID_last);
//Scanline generation
reg [8:0] Y_rb_tmp;
reg [9:0] Y;
wire [8:0] Y_sl_hybr_ref_pre, R_sl_hybr_ref_pre, G_sl_hybr_ref_pre, B_sl_hybr_ref_pre;
lpm_mult_4_hybr_ref_pre Y_sl_hybr_ref_pre_u
(
.clock(pclk_act),
.dataa(Y[9:2]),
.datab(X_SCANLINE_HYBRSTR),
.result(Y_sl_hybr_ref_pre)
);
lpm_mult_4_hybr_ref_pre R_sl_hybr_ref_pre_u
(
.clock(pclk_act),
.dataa(R_pp[`PP_RLPF_PL_END]),
.datab(X_SCANLINE_HYBRSTR),
.result(R_sl_hybr_ref_pre)
);
lpm_mult_4_hybr_ref_pre G_sl_hybr_ref_pre_u
(
.clock(pclk_act),
.dataa(G_pp[`PP_RLPF_PL_END]),
.datab(X_SCANLINE_HYBRSTR),
.result(G_sl_hybr_ref_pre)
);
lpm_mult_4_hybr_ref_pre B_sl_hybr_ref_pre_u
(
.clock(pclk_act),
.dataa(B_pp[`PP_RLPF_PL_END]),
.datab(X_SCANLINE_HYBRSTR),
.result(B_sl_hybr_ref_pre)
);
wire [8:0] Y_sl_hybr_ref, R_sl_hybr_ref, G_sl_hybr_ref, B_sl_hybr_ref;
lpm_mult_4_hybr_ref Y_sl_hybr_ref_u
(
.clock(pclk_act),
.dataa(Y_sl_hybr_ref_pre),
.datab(X_SCANLINESTR),
.result(Y_sl_hybr_ref)
);
lpm_mult_4_hybr_ref R_sl_hybr_ref_u
(
.clock(pclk_act),
.dataa(R_sl_hybr_ref_pre),
.datab(X_SCANLINESTR),
.result(R_sl_hybr_ref)
);
lpm_mult_4_hybr_ref G_sl_hybr_ref_u
(
.clock(pclk_act),
.dataa(G_sl_hybr_ref_pre),
.datab(X_SCANLINESTR),
.result(G_sl_hybr_ref)
);
lpm_mult_4_hybr_ref B_sl_hybr_ref_u
(
.clock(pclk_act),
.dataa(B_sl_hybr_ref_pre),
.datab(X_SCANLINESTR),
.result(B_sl_hybr_ref)
);
reg [7:0] Y_sl_str, R_sl_str, G_sl_str, B_sl_str;
reg [7:0] R_sl_sub, G_sl_sub, B_sl_sub;
wire [7:0] R_sl_mult, G_sl_mult, B_sl_mult;
lpm_mult_4_sl R_sl_mult_u
(
.clock(pclk_act),
.dataa(R_pp[`PP_SLGEN_PL_END-2]),
.datab(~Y_sl_str),
.result(R_sl_mult)
);
lpm_mult_4_sl G_sl_mult_u
(
.clock(pclk_act),
.dataa(G_pp[`PP_SLGEN_PL_END-2]),
.datab(~Y_sl_str),
.result(G_sl_mult)
);
lpm_mult_4_sl B_sl_mult_u
(
.clock(pclk_act),
.dataa(B_pp[`PP_SLGEN_PL_END-2]),
.datab(~Y_sl_str),
.result(B_sl_mult)
);
reg draw_sl;
//Reverse LPF
wire rlpf_trigger_act;
reg signed [14:0] R_diff_s15_pre, G_diff_s15_pre, B_diff_s15_pre, R_diff_s15, G_diff_s15, B_diff_s15;
reg signed [10:0] R_rlpf_result, G_rlpf_result, B_rlpf_result;
function [7:0] apply_reverse_lpf;
input [7:0] data_prev;
input signed [14:0] diff;
reg signed [10:0] result;
begin
// result = ({3'b0,data_prev,4'b0} - diff) >>> 4;
result = {3'b0,data_prev} + ~diff[14:4]; // allow for a small error to reduce adder length
apply_reverse_lpf = result[10] ? 8'h00 : |result[9:8] ? 8'hFF : result[7:0];
end
endfunction
//Mux for active data selection
//
//List of critical signals:
// [RGB]_act, DE_act, HSYNC_act, VSYNC_act
//
//Non-critical signals and inactive clock combinations filtered out in SDC
always @(*)
case (V_MULTMODE)
default: begin //`V_MULTMODE_1X
R_act = R_1x;
G_act = G_1x;
B_act = B_1x;
HSYNC_act = HSYNC_1x;
VSYNC_act = VSYNC_1x;
DE_act = DE_1x;
line_id_act = {2'b00, vcnt_1x[0]};
hcnt_act = hcnt_1x;
vcnt_act = vcnt_1x;
pclk_mux_sel = `PCLK_MUX_1X;
linebuf_hoffset = 0;
col_id_act = {2'b00, hcnt_1x[0]};
rlpf_trigger_act = 1'b1;
end
`V_MULTMODE_2X: begin
R_act = R_lbuf;
G_act = G_lbuf;
B_act = B_lbuf;
HSYNC_act = HSYNC_2x;
VSYNC_act = VSYNC_2x;
DE_act = DE_2x;
line_id_act = {1'b0, line_out_idx_2x[1], line_out_idx_2x[0]^FID_1x};
hcnt_act = hcnt_2x;
vcnt_act = vcnt_2x;
case (H_MULTMODE)
default: begin //`H_MULTMODE_FULLWIDTH
pclk_mux_sel = `PCLK_MUX_2X;
linebuf_hoffset = hcnt_2x;
col_id_act = {2'b00, hcnt_2x[0]};
rlpf_trigger_act = 1'b1;
end
`H_MULTMODE_OPTIMIZED_1X: begin
pclk_mux_sel = `PCLK_MUX_1X; //special case: pclk bypass to enable 2x native sampling
linebuf_hoffset = hcnt_2x_opt;
col_id_act = {2'b00, hcnt_2x[1]};
rlpf_trigger_act = (hcnt_2x_opt_ctr == 0);
end
`H_MULTMODE_OPTIMIZED: begin
pclk_mux_sel = `PCLK_MUX_2X;
linebuf_hoffset = hcnt_2x_opt;
col_id_act = hcnt_2x_opt_ctr;
rlpf_trigger_act = (hcnt_2x_opt_ctr == 0);
end
endcase
end
`V_MULTMODE_3X: begin
R_act = R_lbuf;
G_act = G_lbuf;
B_act = B_lbuf;
HSYNC_act = HSYNC_3x;
VSYNC_act = VSYNC_3x;
DE_act = DE_3x;
line_id_act = {1'b0, line_out_idx_3x};
vcnt_act = vcnt_3x;
case (H_MULTMODE)
default: begin //`H_MULTMODE_FULLWIDTH
pclk_mux_sel = `PCLK_MUX_3X;
linebuf_hoffset = hcnt_3x;
hcnt_act = hcnt_3x;
col_id_act = {2'b00, hcnt_3x[0]};
rlpf_trigger_act = 1'b1;
end
`H_MULTMODE_ASPECTFIX: begin
pclk_mux_sel = `PCLK_MUX_4X;
linebuf_hoffset = hcnt_4x_aspfix;
hcnt_act = hcnt_4x_aspfix;
col_id_act = {2'b00, hcnt_4x[0]};
rlpf_trigger_act = 1'b1;
end
`H_MULTMODE_OPTIMIZED: begin
pclk_mux_sel = `PCLK_MUX_3X;
linebuf_hoffset = hcnt_3x_opt;
hcnt_act = hcnt_3x;
col_id_act = hcnt_3x_opt_ctr;
rlpf_trigger_act = (hcnt_3x_opt_ctr == 0);
end
endcase
end
`V_MULTMODE_4X: begin
R_act = R_lbuf;
G_act = G_lbuf;
B_act = B_lbuf;
HSYNC_act = HSYNC_4x;
VSYNC_act = VSYNC_4x;
DE_act = DE_4x;
line_id_act = {1'b0, line_out_idx_4x};
hcnt_act = hcnt_4x;
vcnt_act = vcnt_4x;
pclk_mux_sel = `PCLK_MUX_4X;
case (H_MULTMODE)
default: begin //`H_MULTMODE_FULLWIDTH
linebuf_hoffset = hcnt_4x;
col_id_act = {2'b00, hcnt_4x[0]};
rlpf_trigger_act = 1'b1;
end
`H_MULTMODE_OPTIMIZED: begin
linebuf_hoffset = hcnt_4x_opt;
col_id_act = hcnt_4x_opt_ctr;
rlpf_trigger_act = (hcnt_4x_opt_ctr == 0);
end
endcase
end
`V_MULTMODE_5X: begin
R_act = R_lbuf;
G_act = G_lbuf;
B_act = B_lbuf;
HSYNC_act = HSYNC_5x;
VSYNC_act = VSYNC_5x;
DE_act = DE_5x;
line_id_act = line_out_idx_5x;
hcnt_act = hcnt_5x;
vcnt_act = vcnt_5x;
pclk_mux_sel = `PCLK_MUX_5X;
case (H_MULTMODE)
default: begin //`H_MULTMODE_FULLWIDTH
linebuf_hoffset = hcnt_5x_hscomp;
col_id_act = {2'b00, hcnt_5x[0]};
rlpf_trigger_act = 1'b1;
end
`H_MULTMODE_OPTIMIZED: begin
linebuf_hoffset = hcnt_5x_opt;
col_id_act = hcnt_5x_opt_ctr;
rlpf_trigger_act = (hcnt_5x_opt_ctr == 0);
end
endcase
end
endcase
//TODO: use single PLL and ALTPLL_RECONFIG
pll_2x pll_linedouble (
.areset ( (V_MULTMODE != `V_MULTMODE_2X) & (V_MULTMODE != `V_MULTMODE_5X) ),
.inclk0 ( PCLK_in ),
.c0 ( pclk_2x ),
.c1 ( pclk_5x ),
.locked ( pclk_2x_lock )
);
pll_3x pll_linetriple (
.areset ( (V_MULTMODE != `V_MULTMODE_3X) & (V_MULTMODE != `V_MULTMODE_4X) ),
.inclk0 ( PCLK_in ),
.c0 ( pclk_3x ),
.c1 ( pclk_4x ),
.locked ( pclk_3x_lock )
);
wire [11:0] linebuf_rdaddr = linebuf_hoffset-H_AVIDSTART;
wire [11:0] linebuf_wraddr = hcnt_1x-H_AVIDSTART;
//TODO: add secondary buffers for interlaced signals with alternative field order
linebuf linebuf_rgb (
.data({R_in_L, G_in_L, B_in_L}),
.rdaddress ( {~line_idx, linebuf_rdaddr[10:0]} ),
.rdclock ( pclk_act ),
.wraddress( {line_idx, linebuf_wraddr[10:0]} ),
.wrclock ( pclk_1x ),
.wren ( !linebuf_wraddr[11] ),
.q ( {R_lbuf, G_lbuf, B_lbuf} )
);
mux5 mux5_inst (
.data0 ( pclk_1x ),
.data1 ( pclk_2x ),
.data2 ( pclk_3x ),
.data3 ( pclk_4x ),
.data4 ( pclk_5x ),
.sel ( pclk_mux_sel ),
.result ( pclk_act )
);
//Postprocess pipeline
//
// Latency with respect to h_cnt/v_cnt before 1st stage:
// line_id, col_id: 0 cycles
// HSYNC, VSYNC, DE: 1 cycle
// RGB: 2 cycles
//
// Pipeline structure
// | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
// |-------|-------|-------|-------|-------|-------|-------|-------|-------|-------|-------|
// | LBUF | LBUF | | | | | | | | | |
// | | | RLPF | RLPF | RLPF | | | | | | |
// | | | | Y | Y | | | | | | |
// | | | | | | SLG | SLG | SLG | SLG | SLG | |
// | | | | | | | | | | | MASK |
// | | | | | | | | | | | LTBOX |
integer pp_idx;
always @(posedge pclk_act)
begin
line_id_pp[1] <= line_id_act;
col_id_pp[1] <= col_id_act;
for(pp_idx = 2; pp_idx <= `PP_SLGEN_PL_END-2; pp_idx = pp_idx+1) begin
line_id_pp[pp_idx] <= line_id_pp[pp_idx-1];
col_id_pp[pp_idx] <= col_id_pp[pp_idx-1];
end
hcnt_pp <= hcnt_act;
vcnt_pp <= vcnt_act;
border_enable_pp[2] <= ((hcnt_pp < H_AVIDMASK_START) | (hcnt_pp >= H_AVIDMASK_STOP) | (vcnt_pp < V_AVIDMASK_START) | (vcnt_pp >= V_AVIDMASK_STOP));
for(pp_idx = 3; pp_idx <= `PP_PIPELINE_LENGTH; pp_idx = pp_idx+1) begin
border_enable_pp[pp_idx] <= border_enable_pp[pp_idx-1];
end
case (lt_mode)
default: begin
lt_box_enable_pp[2] <= 0;
end
`LT_POS_TOPLEFT: begin
lt_box_enable_pp[2] <= ((hcnt_pp < LT_POS_TOPLEFT_BOX_H_STOP) && (vcnt_pp < LT_POS_TOPLEFT_BOX_V_STOP)) ? 1'b1 : 1'b0;
end
`LT_POS_CENTER: begin
lt_box_enable_pp[2] <= ((hcnt_pp >= LT_POS_CENTER_BOX_H_START) && (hcnt_pp < LT_POS_CENTER_BOX_H_STOP) && (vcnt_pp >= LT_POS_CENTER_BOX_V_START) && (vcnt_pp < LT_POS_CENTER_BOX_V_STOP)) ? 1'b1 : 1'b0;
end
`LT_POS_BOTTOMRIGHT: begin
lt_box_enable_pp[2] <= ((hcnt_pp >= LT_POS_BOTTOMRIGHT_H_START) && (vcnt_pp >= LT_POS_BOTTOMRIGHT_V_START)) ? 1'b1 : 1'b0;
end
endcase
for(pp_idx = 3; pp_idx <= `PP_PIPELINE_LENGTH; pp_idx = pp_idx+1) begin
lt_box_enable_pp[pp_idx] <= lt_box_enable_pp[pp_idx-1];
end
HSYNC_pp[2] <= HSYNC_act;
VSYNC_pp[2] <= VSYNC_act;
DE_pp[2] <= DE_act;
for(pp_idx = 3; pp_idx <= `PP_PIPELINE_LENGTH; pp_idx = pp_idx+1) begin
HSYNC_pp[pp_idx] <= HSYNC_pp[pp_idx-1];
VSYNC_pp[pp_idx] <= VSYNC_pp[pp_idx-1];
DE_pp[pp_idx] <= DE_pp[pp_idx-1];
end
HSYNC_out <= HSYNC_pp[`PP_PIPELINE_LENGTH];
VSYNC_out <= VSYNC_pp[`PP_PIPELINE_LENGTH];
DE_out <= DE_pp[`PP_PIPELINE_LENGTH];
// get RGB and delay it
R_pp[3] <= R_act;
G_pp[3] <= G_act;
B_pp[3] <= B_act;
for(pp_idx = 4; pp_idx <= `PP_PIPELINE_LENGTH; pp_idx = pp_idx + 1) begin
R_pp[pp_idx] <= R_pp[pp_idx-1];
G_pp[pp_idx] <= G_pp[pp_idx-1];
B_pp[pp_idx] <= B_pp[pp_idx-1];
end
R_out <= R_pp[`PP_PIPELINE_LENGTH];
G_out <= G_pp[`PP_PIPELINE_LENGTH];
B_out <= B_pp[`PP_PIPELINE_LENGTH];
// reverse LPF ...
rlpf_trigger_r[1] <= rlpf_trigger_act;
for(pp_idx = 2; pp_idx <= `PP_RLPF_PL_START-1; pp_idx = pp_idx + 1)
rlpf_trigger_r[`PP_RLPF_PL_START-1] <= rlpf_trigger_r[1];
// Optimized modes repeat pixels. Save previous pixel only when linebuffer offset changes.
if (rlpf_trigger_r[`PP_RLPF_PL_START-1]) begin
`ifdef PP_RLPF_PL_START_EARLY
R_prev_pp[`PP_RLPF_PL_START] <= R_act;
G_prev_pp[`PP_RLPF_PL_START] <= G_act;
B_prev_pp[`PP_RLPF_PL_START] <= B_act;
`else
R_prev_pp[`PP_RLPF_PL_START] <= R_pp[`PP_RLPF_PL_START];
G_prev_pp[`PP_RLPF_PL_START] <= G_pp[`PP_RLPF_PL_START];
B_prev_pp[`PP_RLPF_PL_START] <= B_pp[`PP_RLPF_PL_START];
`endif
end
for(pp_idx = `PP_RLPF_PL_START+1; pp_idx <= `PP_RLPF_PL_END-1; pp_idx = pp_idx + 1) begin
R_prev_pp[pp_idx] <= R_prev_pp[pp_idx-1];
G_prev_pp[pp_idx] <= G_prev_pp[pp_idx-1];
B_prev_pp[pp_idx] <= B_prev_pp[pp_idx-1];
end
// ... step 1
`ifdef PP_RLPF_PL_START_EARLY
R_diff_s15_pre <= (R_prev_pp[`PP_RLPF_PL_START] - R_act);
G_diff_s15_pre <= (G_prev_pp[`PP_RLPF_PL_START] - G_act);
B_diff_s15_pre <= (B_prev_pp[`PP_RLPF_PL_START] - B_act);
`else
R_diff_s15_pre <= (R_prev_pp[`PP_RLPF_PL_START] - R_pp[`PP_RLPF_PL_START]);
G_diff_s15_pre <= (G_prev_pp[`PP_RLPF_PL_START] - G_pp[`PP_RLPF_PL_START]);
B_diff_s15_pre <= (B_prev_pp[`PP_RLPF_PL_START] - B_pp[`PP_RLPF_PL_START]);
`endif
// ... step 2
// R_diff_s15, G_diff_s15, B_diff_s15 are outputs of multiplier IPs 12 pp-stage delay)
R_diff_s15 <= (R_diff_s15_pre * X_REV_LPF_STR);
G_diff_s15 <= (G_diff_s15_pre * X_REV_LPF_STR);
B_diff_s15 <= (B_diff_s15_pre * X_REV_LPF_STR);
// ... step 3
if (X_REV_LPF_ENABLE) begin
R_pp[`PP_RLPF_PL_END] <= apply_reverse_lpf(R_prev_pp[`PP_RLPF_PL_END-1], R_diff_s15);
G_pp[`PP_RLPF_PL_END] <= apply_reverse_lpf(G_prev_pp[`PP_RLPF_PL_END-1], G_diff_s15);
B_pp[`PP_RLPF_PL_END] <= apply_reverse_lpf(B_prev_pp[`PP_RLPF_PL_END-1], B_diff_s15);
end
// calculate Y (based on non-reverseLPF values to keep pipeline length a bit lower)
Y_rb_tmp <= {1'b0,R_pp[`PP_RLPF_PL_END-2]} + {1'b0,B_pp[`PP_RLPF_PL_END-2]};
Y <= {1'b0,Y_rb_tmp} + {1'b0,G_pp[`PP_RLPF_PL_END-1],1'b0};
// modify scanline strength (3 pp-stages)
// ... step 1/3
// Y_sl_hybr_ref_tmp, R_sl_hybr_ref_tmp, G_sl_hybr_ref_tmp, B_sl_hybr_ref_tmp are outputs of multiplier IPs (1 pp-stage delay)
// ... step 2/3
// Y_sl_hybr_ref,R_sl_hybr_ref,G_sl_hybr_ref,B_sl_hybr_ref are outputs of multiplier IPs (1 pp-stage delay)
// ... step 3/3
Y_sl_str <= {1'b0,X_SCANLINESTR} < Y_sl_hybr_ref ? 8'h0 : X_SCANLINESTR - Y_sl_hybr_ref[7:0];
R_sl_str <= {1'b0,X_SCANLINESTR} < R_sl_hybr_ref ? 8'h0 : X_SCANLINESTR - R_sl_hybr_ref[7:0];
G_sl_str <= {1'b0,X_SCANLINESTR} < G_sl_hybr_ref ? 8'h0 : X_SCANLINESTR - G_sl_hybr_ref[7:0];
B_sl_str <= {1'b0,X_SCANLINESTR} < B_sl_hybr_ref ? 8'h0 : X_SCANLINESTR - B_sl_hybr_ref[7:0];
// perform scanline generation (1 pp-stage)
// R_sl_mult, G_sl_mult and B_sl_mult are registered outputs of IP blocks (1 pp-stage delay)
R_sl_sub <= (R_pp[`PP_SLGEN_PL_END-2] > R_sl_str) ? (R_pp[`PP_SLGEN_PL_END-2]-R_sl_str) : 8'h00;
G_sl_sub <= (G_pp[`PP_SLGEN_PL_END-2] > G_sl_str) ? (G_pp[`PP_SLGEN_PL_END-2]-G_sl_str) : 8'h00;
B_sl_sub <= (B_pp[`PP_SLGEN_PL_END-2] > B_sl_str) ? (B_pp[`PP_SLGEN_PL_END-2]-B_sl_str) : 8'h00;
draw_sl <= |{(V_SCANLINEMODE == `SCANLINES_H) && (V_SCANLINEID & (5'h1<<line_id_pp[`PP_SLGEN_PL_END-2])),
(V_SCANLINEMODE == `SCANLINES_V) && (5'h0 == col_id_pp[`PP_SLGEN_PL_END-2]),
(V_SCANLINEMODE == `SCANLINES_ALT) && (V_SCANLINEID & (5'h1<<(line_id_pp[`PP_SLGEN_PL_END-2]^FID_1x)))};
// draw scanline (1 pp-stage)
if (draw_sl) begin
R_pp[`PP_SLGEN_PL_END] <= X_SCANLINE_METHOD ? R_sl_sub : R_sl_mult;
G_pp[`PP_SLGEN_PL_END] <= X_SCANLINE_METHOD ? G_sl_sub : G_sl_mult;
B_pp[`PP_SLGEN_PL_END] <= X_SCANLINE_METHOD ? B_sl_sub : B_sl_mult;
end
// apply LT box / mask
if (lt_active) begin
R_out <= {8{lt_box_enable_pp[`PP_PIPELINE_LENGTH]}};
G_out <= {8{lt_box_enable_pp[`PP_PIPELINE_LENGTH]}};
B_out <= {8{lt_box_enable_pp[`PP_PIPELINE_LENGTH]}};
end else if (border_enable_pp[`PP_PIPELINE_LENGTH]) begin
R_out <= {2{X_MASK_BR}};
G_out <= {2{X_MASK_BR}};
B_out <= {2{X_MASK_BR}};
end
end
//Generate a warning signal from horizontal instability or PLL sync loss
always @(posedge pclk_1x or negedge reset_n)
begin
if (!reset_n) begin
warn_h_unstable <= 1'b0;
warn_pll_lock_lost <= 1'b0;
warn_pll_lock_lost_3x <= 1'b0;
end else begin
if (hmax[0] != hmax[1])
warn_h_unstable <= 1;
else if (warn_h_unstable != 0)
warn_h_unstable <= warn_h_unstable + 1'b1;
if (((V_MULTMODE == `V_MULTMODE_2X) | (V_MULTMODE == `V_MULTMODE_5X)) & ~pclk_2x_lock)
warn_pll_lock_lost <= 1;
else if (warn_pll_lock_lost != 0)
warn_pll_lock_lost <= warn_pll_lock_lost + 1'b1;
if (((V_MULTMODE == `V_MULTMODE_3X) | (V_MULTMODE == `V_MULTMODE_4X)) & ~pclk_3x_lock)
warn_pll_lock_lost_3x <= 1;
else if (warn_pll_lock_lost_3x != 0)
warn_pll_lock_lost_3x <= warn_pll_lock_lost_3x + 1'b1;
end
end
assign h_unstable = (warn_h_unstable != 0);
assign pll_lock_lost = {(warn_pll_lock_lost != 0), (warn_pll_lock_lost_3x != 0)};
//Detect if TVP7002 is skipping VSYNCs. This occurs for interlaced signals fed via digital sync inputs,
//causing TVP7002 not to regenerate VSYNC for field 1. Moreover, if leading edges of HSYNC and VSYNC are
//too far from each other for field 0, no VSYNC is regenerated at all. This can be avoided by disabling
//doubled sampling rates ("AV3 interlacefix") and/or minimizing VSYNC delay induced by RC filter on PCB.
//However, TVP7002 datasheet warns that HSYNC/VSYNC should not change simultaneously, so leaving out the
//filter may lead to stability issues and is not recommended. A combination of 220ohm resistor and 1nF
//capacitor seems to be optimal for 480i/576i, including doubled sampling rates.
always @(posedge clk27 or negedge reset_n)
begin
if (!reset_n) begin
fpga_vsyncgen[`VSYNCGEN_GENMID_BIT] <= 1'b0;
VSYNC_in_cc_L <= 1'b0;
VSYNC_in_cc_LL <= 1'b0;
VSYNC_in_cc_LLL <= 1'b0;
clk27_ctr <= 0;
dbl_frame_ctr <= 0;
end else begin
if ((VSYNC_in_cc_LLL == `HI) && (VSYNC_in_cc_LL == `LO)) begin
// If calculated refresh rate is between 22Hz and 44Hz, assume TVP7002 has skipped a vsync
if ((clk27_ctr >= (27000000/44)) && (clk27_ctr <= (27000000/22)) && (dbl_frame_ctr < `DBLFRAME_THOLD))
dbl_frame_ctr <= dbl_frame_ctr + 1'b1;
else if ((clk27_ctr < (27000000/44)) && (dbl_frame_ctr > 0))
dbl_frame_ctr <= dbl_frame_ctr - 1'b1;
clk27_ctr <= 0;
end else if (clk27_ctr < (27000000/10)) begin //prevent overflow
clk27_ctr <= clk27_ctr + 1'b1;
end
if (dbl_frame_ctr == 0)
fpga_vsyncgen[`VSYNCGEN_GENMID_BIT] <= 1'b0;
else if (dbl_frame_ctr == `DBLFRAME_THOLD)
fpga_vsyncgen[`VSYNCGEN_GENMID_BIT] <= 1'b1;
VSYNC_in_cc_L <= VSYNC_in;
VSYNC_in_cc_LL <= VSYNC_in_cc_L;
VSYNC_in_cc_LLL <= VSYNC_in_cc_LL;
end
end
//Calculate exact vertical frequency
always @(posedge clk27 or negedge reset_n)
begin
if (!reset_n) begin
frame_change_longpulse_cc_L <= 1'b0;
frame_change_longpulse_cc_LL <= 1'b0;
frame_change_longpulse_cc_LLL <= 1'b0;
pcnt_ctr <= 1;
pcnt_frame <= 1;
end else begin
if (frame_change_longpulse_cc_LL & !frame_change_longpulse_cc_LLL) begin
pcnt_ctr <= 1;
pcnt_frame <= pcnt_ctr;
end else if (pcnt_ctr < 20'hfffff) begin
pcnt_ctr <= pcnt_ctr + 1'b1;
end
frame_change_longpulse_cc_L <= frame_change_longpulse;
frame_change_longpulse_cc_LL <= frame_change_longpulse_cc_L;
frame_change_longpulse_cc_LLL <= frame_change_longpulse_cc_LL;
end
end
wire [11:0] H_L5BORDER_1920_tmp = (11'd1920-h_info[10:0]);
wire [11:0] H_L5BORDER_1600_tmp = (11'd1600-h_info[10:0]);
//Buffer the inputs using input pixel clock and generate 1x signals
always @(posedge pclk_1x or negedge reset_n)
begin
if (!reset_n) begin
hcnt_1x <= 0;
vcnt_1x <= 0;
vcnt_tvp <= 0;
hmax[0] <= 0;
hmax[1] <= 0;
vmax <= 0;
vmax_tvp <= 0;
line_idx <= 0;
FID_cur <= 1'b0;
FID_last <= 1'b0;
line_change <= 1'b0;
frame_change <= 1'b0;
frame_change_longpulse <= 1'b0;
fpga_vsyncgen[`VSYNCGEN_CHOPMID_BIT] <= 1'b0;
H_MULTMODE <= 0;
V_MULTMODE <= 0;
end else begin
if (`HSYNC_LEADING_EDGE) begin
hcnt_1x <= 0;
hmax[line_idx] <= hcnt_1x;
line_idx <= line_idx ^ 1'b1;
line_change <= 1'b1;
end else begin
hcnt_1x <= hcnt_1x + 1'b1;
line_change <= 1'b0;
end
if (`HSYNC_LEADING_EDGE) begin
if (`VSYNC_LEADING_EDGE) begin // non-interlace frame or even field (interlace) start
FID_cur <= 1'b0;
FID_last <= FID_cur;
vcnt_1x <= 0;
frame_change <= 1'b1;
vmax <= vcnt_1x;
vcnt_tvp <= 0;
vmax_tvp <= vcnt_tvp;
end else begin
vcnt_1x <= vcnt_1x + 1'b1;
vcnt_tvp <= vcnt_tvp + 1'b1;
end
end else if (`VSYNC_LEADING_EDGE) begin // odd field (interlace) start
if (!`FALSE_FIELD) begin
FID_cur <= 1'b1;
FID_last <= FID_cur;
vcnt_1x <= 11'h7ff; // -1 for 11 bit word
frame_change <= 1'b1;
//vmax <= vcnt_1x;
end
vcnt_tvp <= 0;
vmax_tvp <= vcnt_tvp;
end else if ((fpga_vsyncgen[`VSYNCGEN_GENMID_BIT]) && (vcnt_tvp == (vmax_tvp>>1)) && (hcnt_1x == (hmax[~line_idx]>>1))) begin //VSM=1
FID_cur <= 1'b1;
FID_last <= FID_cur;
vcnt_1x <= 11'h7ff; // -1 for 11 bit word
frame_change <= 1'b1;
//vmax <= vcnt_1x;
end else
frame_change <= 1'b0;
if (`VSYNC_LEADING_EDGE) begin
FID_prev <= FID_in;
// detect non-interlaced signal with odd-odd field signaling (TVP7002 detects it as interlaced with analog sync inputs).
// FID is updated at leading edge of VSYNC
if (FID_in == FID_prev)
fpga_vsyncgen[`VSYNCGEN_CHOPMID_BIT] <= `FALSE;
else if (FID_in == `FID_ODD) // TVP7002 falsely indicates field change with (vcnt < active_lines)
fpga_vsyncgen[`VSYNCGEN_CHOPMID_BIT] <= (vcnt_tvp < `MIN_VALID_LINES);
end
if (frame_change) begin
//Read configuration data from CPU
H_MULTMODE <= h_info[31:30]; // Horizontal scaling mode
V_MULTMODE <= v_info[31:29]; // Line multiply mode
H_SYNCLEN <= h_info[27:20]; // Horizontal sync length (0...255)
H_AVIDSTART <= h_info[19:11] + h_info[27:20]; // Horizontal sync+backporch length (0...1023)
H_ACTIVE <= h_info[10:0]; // Horizontal active length (0...2047)
V_SYNCLEN <= v_info[19:17]; // Vertical sync length (0...7)
V_AVIDSTART <= v_info[16:11] + v_info[19:17]; // Vertical sync+backporch length (0...127)
V_ACTIVE <= v_info[10:0]; // Vertical active length (0...2047)
H_MASK <= h_info2[29:19];
V_MASK <= v_info[25:20];
V_SCANLINEMODE <= v_info[28:27];
case (v_info[31:29])
`V_MULTMODE_1X, `V_MULTMODE_2X: V_SCANLINEID <= (5'b00001 << v_info[26]);
`V_MULTMODE_3X: V_SCANLINEID <= (5'b00001 << {v_info[26], 1'b0});
`V_MULTMODE_4X: V_SCANLINEID <= (5'b00011 << {v_info[26], 1'b0});
`V_MULTMODE_5X: V_SCANLINEID <= (5'b00011 << {2{v_info[26]}});
endcase
// H_L5BORDER <= h_info[29] ? (11'd1920-h_info[10:0])/2 : (11'd1600-h_info[10:0])/2;
H_L5BORDER <= h_info[29] ? H_L5BORDER_1920_tmp[10:1] : H_L5BORDER_1600_tmp[10:1];
// For Line3x 240x360
H_L3BORDER <= h_info[28] ? H_L5BORDER_1920_tmp[10:1] : 10'd0;
H_L3_OPT_SAMPLE_COMP <= h_info[28] ? 7'd90 : 7'd0;
H_OPT_SCALE <= h_info2[18:16];
H_OPT_SAMPLE_SEL <= h_info2[15:13];
H_OPT_SAMPLE_MULT <= h_info2[12:10];
H_OPT_STARTOFF <= h_info2[9:0];
X_REV_LPF_ENABLE <= (extra_info[18:14] != 5'b00000);
X_REV_LPF_STR <= (extra_info[18:14] + 6'd16);
X_MASK_BR <= extra_info[13:10];
X_SCANLINE_METHOD <= extra_info[9];
X_SCANLINE_HYBRSTR <= extra_info[8:4];
X_SCANLINESTR <= ((extra_info[3:0]+8'h01)<<4)-1'b1;
CALC_CONSTS <= 1'b1;
end
// generate long pulse for hz counter
if (frame_change)
frame_change_longpulse <= 1'b1;
else if (vcnt_1x > 0)
frame_change_longpulse <= 1'b0;
if (CALC_CONSTS) begin
H_AVIDSTOP <= H_AVIDSTART+H_ACTIVE;
V_AVIDSTOP <= V_AVIDSTART+V_ACTIVE;
H_AVIDMASK_START <= H_AVIDSTART+H_MASK;
H_AVIDMASK_STOP <= H_AVIDSTART+H_ACTIVE-H_MASK;
V_AVIDMASK_START <= V_AVIDSTART+V_MASK;
V_AVIDMASK_STOP <= V_AVIDSTART+V_ACTIVE-V_MASK;
LT_POS_TOPLEFT_BOX_H_STOP <= H_AVIDSTART+(H_ACTIVE/`LT_WIDTH_DIV);
LT_POS_TOPLEFT_BOX_V_STOP <= V_AVIDSTART+(V_ACTIVE/`LT_HEIGHT_DIV);
LT_POS_CENTER_BOX_H_START <= H_AVIDSTART+(H_ACTIVE/2)-(H_ACTIVE/(`LT_WIDTH_DIV*2));
LT_POS_CENTER_BOX_H_STOP <= H_AVIDSTART+(H_ACTIVE/2)+(H_ACTIVE/(`LT_WIDTH_DIV*2));
LT_POS_CENTER_BOX_V_START <= V_AVIDSTART+(V_ACTIVE/2)-(V_ACTIVE/(`LT_HEIGHT_DIV*2));
LT_POS_CENTER_BOX_V_STOP <= V_AVIDSTART+(V_ACTIVE/2)+(V_ACTIVE/(`LT_HEIGHT_DIV*2));
LT_POS_BOTTOMRIGHT_H_START <= H_AVIDSTART+H_ACTIVE-(H_ACTIVE/`LT_WIDTH_DIV);
LT_POS_BOTTOMRIGHT_V_START <= V_AVIDSTART+V_ACTIVE-(V_ACTIVE/`LT_HEIGHT_DIV);
CALC_CONSTS <= 1'b0;
end
R_in_L <= R_in;
G_in_L <= G_in;
B_in_L <= B_in;
HSYNC_in_L <= HSYNC_in;
VSYNC_in_L <= VSYNC_in;
// Add one delay stage to match linebuf delay
R_in_LL <= R_in_L;
G_in_LL <= G_in_L;
B_in_LL <= B_in_L;
R_1x <= R_in_LL;
G_1x <= G_in_LL;
B_1x <= B_in_LL;
HSYNC_1x <= (hcnt_1x < H_SYNCLEN) ? `HSYNC_POL : ~`HSYNC_POL;
if (FID_cur == `FID_EVEN)
VSYNC_1x <= (vcnt_1x < V_SYNCLEN) ? `VSYNC_POL : ~`VSYNC_POL;
else
VSYNC_1x <= (((vcnt_1x+1'b1) < V_SYNCLEN) | ((vcnt_1x+1'b1 == V_SYNCLEN) & (hcnt_1x <= (hmax[~line_idx]>>1)))) ? `VSYNC_POL : ~`VSYNC_POL;
DE_1x <= ((hcnt_1x >= H_AVIDSTART) & (hcnt_1x < H_AVIDSTOP)) & ((vcnt_1x >= V_AVIDSTART) & (vcnt_1x < V_AVIDSTOP));
FID_1x <= FID_cur;
end
end
//Generate 2x signals for linedouble
always @(posedge pclk_2x or negedge reset_n)
begin
if (!reset_n) begin
hcnt_2x <= 0;
vcnt_2x <= 0;
line_out_idx_2x <= 0;
end else begin
if ((pclk_1x == 1'b1) & (line_change | frame_change)) begin //aligned with negedge of pclk_1x
hcnt_2x <= 0;
hcnt_2x_opt <= H_OPT_SAMPLE_SEL;
hcnt_2x_opt_ctr <= 0;
line_out_idx_2x <= 0;
if (frame_change)
vcnt_2x <= 11'h7ff; // -1 for 11 bit word
else if (line_change & (FID_cur == `FID_EVEN))
vcnt_2x <= vcnt_2x + 1'b1;
end else if (hcnt_2x == hmax[~line_idx]) begin
hcnt_2x <= 0;
line_out_idx_2x <= line_out_idx_2x + 1'b1;
hcnt_2x_opt <= H_OPT_SAMPLE_SEL;
hcnt_2x_opt_ctr <= 0;
if (FID_cur == `FID_ODD)
vcnt_2x <= vcnt_2x + 1'b1;
end else begin
hcnt_2x <= hcnt_2x + 1'b1;
if (hcnt_2x >= H_OPT_STARTOFF) begin
if (hcnt_2x_opt_ctr == H_OPT_SCALE-1'b1) begin
hcnt_2x_opt <= hcnt_2x_opt + H_OPT_SAMPLE_MULT;
hcnt_2x_opt_ctr <= 0;
end else
hcnt_2x_opt_ctr <= hcnt_2x_opt_ctr + 1'b1;
end
end
HSYNC_2x <= (hcnt_2x < H_SYNCLEN) ? `HSYNC_POL : ~`HSYNC_POL;
VSYNC_2x <= (vcnt_2x < V_SYNCLEN) ? `VSYNC_POL : ~`VSYNC_POL;
DE_2x <= ((hcnt_2x >= H_AVIDSTART) & (hcnt_2x < H_AVIDSTOP)) & ((vcnt_2x >= V_AVIDSTART) & (vcnt_2x < V_AVIDSTOP));
end
end
always @(posedge pclk_3x or negedge reset_n)
begin
if (!reset_n) begin
hcnt_3x <= 0;
vcnt_3x <= 0;
line_out_idx_3x <= 0;
end else begin
if ((pclk_3x_cnt == 0) & (line_change | frame_change)) begin //aligned with posedge of pclk_1x
if (!(frame_change & (FID_cur == `FID_ODD))) begin
hcnt_3x <= 0;
hcnt_3x_opt <= H_OPT_SAMPLE_SEL + H_L3_OPT_SAMPLE_COMP;
hcnt_3x_opt_ctr <= 0;
line_out_idx_3x <= 0;
end
if (frame_change)
vcnt_3x <= -11'b1-FID_cur;
else if (line_change)
vcnt_3x <= vcnt_3x + 1'b1;
end else if (hcnt_3x == hmax[~line_idx]) begin
hcnt_3x <= 0;
line_out_idx_3x <= line_out_idx_3x + 1'b1;
hcnt_3x_opt <= H_OPT_SAMPLE_SEL + H_L3_OPT_SAMPLE_COMP;
hcnt_3x_opt_ctr <= 0;
end else begin
hcnt_3x <= hcnt_3x + 1'b1;
if (hcnt_3x >= H_OPT_STARTOFF) begin
if (hcnt_3x_opt_ctr == H_OPT_SCALE-1'b1) begin
hcnt_3x_opt <= hcnt_3x_opt + H_OPT_SAMPLE_MULT;
hcnt_3x_opt_ctr <= 0;
end else
hcnt_3x_opt_ctr <= hcnt_3x_opt_ctr + 1'b1;
end
end
//track pclk_3x alignment to pclk_1x rising edge (pclk_1x=1 @ 120deg & pclk_1x=0 @ 240deg)
if (((pclk_1x_prev3x == 1'b1) & (pclk_1x == 1'b0)) | (pclk_3x_cnt == 2'h2))
pclk_3x_cnt <= 0;
else
pclk_3x_cnt <= pclk_3x_cnt + 1'b1;
pclk_1x_prev3x <= pclk_1x;
HSYNC_3x <= (hcnt_3x < H_SYNCLEN) ? `HSYNC_POL : ~`HSYNC_POL;
if (FID_cur == `FID_EVEN)
VSYNC_3x <= (vcnt_3x < V_SYNCLEN) ? `VSYNC_POL : ~`VSYNC_POL;
else begin
if ((vcnt_3x+1'b1 == 11'd0) & (line_out_idx_3x == 1) & (hcnt_3x == (hmax[~line_idx]>>1)+1'b1))
VSYNC_3x <= `VSYNC_POL;
else if ((vcnt_3x+1'b1 == V_SYNCLEN) & (line_out_idx_3x == 1) & (hcnt_3x == (hmax[~line_idx]>>1)+1'b1))
VSYNC_3x <= ~`VSYNC_POL;
end
DE_3x <= ((hcnt_3x >= H_AVIDSTART-H_L3BORDER) & (hcnt_3x < H_AVIDSTOP+H_L3BORDER)) & ((vcnt_3x >= V_AVIDSTART) & (vcnt_3x < V_AVIDSTOP));
end
end
always @(posedge pclk_4x or negedge reset_n)
begin
if (!reset_n) begin
hcnt_4x <= 0;
vcnt_4x <= 0;
line_out_idx_4x <= 0;
end else begin
// TODO: better implementation
if ((DE_3x == 1) & (DE_3x_prev4x == 0))
hcnt_4x_aspfix <= hcnt_3x - 12'd160;
else
hcnt_4x_aspfix <= hcnt_4x_aspfix + 1'b1;
DE_3x_prev4x <= DE_3x;
if ((pclk_4x_cnt == 0) & (line_change | frame_change)) begin //aligned with posedge of pclk_1x
hcnt_4x <= 0;
hcnt_4x_opt <= H_OPT_SAMPLE_SEL;
hcnt_4x_opt_ctr <= 0;
line_out_idx_4x <= 0;
if (frame_change)
vcnt_4x <= 11'h7ff; // -1 for 11 bit word
else if (line_change & (FID_cur == `FID_EVEN))
vcnt_4x <= vcnt_4x + 1'b1;
end else if (hcnt_4x == hmax[~line_idx]) begin
hcnt_4x <= 0;
line_out_idx_4x <= line_out_idx_4x + 1'b1;
hcnt_4x_opt <= H_OPT_SAMPLE_SEL;
hcnt_4x_opt_ctr <= 0;
if ((FID_cur == `FID_ODD) && (line_out_idx_4x == 1))
vcnt_4x <= vcnt_4x + 1'b1;
end else begin
hcnt_4x <= hcnt_4x + 1'b1;
if (hcnt_4x >= H_OPT_STARTOFF) begin
if (hcnt_4x_opt_ctr == H_OPT_SCALE-1'b1) begin
hcnt_4x_opt <= hcnt_4x_opt + H_OPT_SAMPLE_MULT;
hcnt_4x_opt_ctr <= 0;
end else
hcnt_4x_opt_ctr <= hcnt_4x_opt_ctr + 1'b1;
end
end
//track pclk_4x alignment to pclk_1x rising edge (pclk_1x=1 @ 180deg & pclk_1x=0 @ 270deg)
if (((pclk_1x_prev4x == 1'b1) & (pclk_1x == 1'b0)) | (pclk_4x_cnt == 2'h3))
pclk_4x_cnt <= 0;
else
pclk_4x_cnt <= pclk_4x_cnt + 1'b1;
pclk_1x_prev4x <= pclk_1x;
HSYNC_4x <= (hcnt_4x < H_SYNCLEN) ? `HSYNC_POL : ~`HSYNC_POL;
VSYNC_4x <= (vcnt_4x < V_SYNCLEN) ? `VSYNC_POL : ~`VSYNC_POL;
DE_4x <= ((hcnt_4x >= H_AVIDSTART) & (hcnt_4x < H_AVIDSTOP)) & ((vcnt_4x >= V_AVIDSTART) & (vcnt_4x < V_AVIDSTOP));
end
end
always @(posedge pclk_5x or negedge reset_n)
begin
if (!reset_n) begin
hcnt_5x <= 0;
vcnt_5x <= 0;
line_out_idx_5x <= 0;
end else begin
if ((pclk_5x_cnt == 0) & (line_change | frame_change)) begin //aligned with posedge of pclk_1x
hcnt_5x <= 0;
hcnt_5x_opt <= H_OPT_SAMPLE_SEL + 11'd120;
hcnt_5x_opt_ctr <= 0;
line_out_idx_5x <= 0;
if (frame_change)
vcnt_5x <= 11'h7ff; // -1 for 11 bit word
else if (line_change)
vcnt_5x <= vcnt_5x + 1'b1;
end else if (hcnt_5x == hmax[~line_idx]) begin
hcnt_5x <= 0;
line_out_idx_5x <= line_out_idx_5x + 1'b1;
hcnt_5x_opt <= H_OPT_SAMPLE_SEL + 11'd120;
hcnt_5x_opt_ctr <= 0;
end else begin
hcnt_5x <= hcnt_5x + 1'b1;
if (hcnt_5x >= H_OPT_STARTOFF) begin
if (hcnt_5x_opt_ctr == H_OPT_SCALE-1'b1) begin
hcnt_5x_opt <= hcnt_5x_opt + H_OPT_SAMPLE_MULT;
hcnt_5x_opt_ctr <= 0;
end else
hcnt_5x_opt_ctr <= hcnt_5x_opt_ctr + 1'b1;
end
end
//track pclk_5x alignment to pclk_1x rising edge (pclk_1x=1 @ 144deg & pclk_1x=0 @ 216deg & pclk_1x=0 @ 288deg)
if (((pclk_1x_prevprev5x == 1'b1) & (pclk_1x_prev5x == 1'b0)) | (pclk_5x_cnt == 3'h4))
pclk_5x_cnt <= 0;
else
pclk_5x_cnt <= pclk_5x_cnt + 1'b1;
pclk_1x_prev5x <= pclk_1x;
pclk_1x_prevprev5x <= pclk_1x_prev5x;
hcnt_5x_hscomp <= hcnt_5x + 11'd121;
HSYNC_5x <= (hcnt_5x < H_SYNCLEN) ? `HSYNC_POL : ~`HSYNC_POL;
VSYNC_5x <= (vcnt_5x < V_SYNCLEN) ? `VSYNC_POL : ~`VSYNC_POL;
DE_5x <= ((hcnt_5x >= H_AVIDSTART-H_L5BORDER) & (hcnt_5x < H_AVIDSTOP+H_L5BORDER)) & ((vcnt_5x >= V_AVIDSTART) & (vcnt_5x < V_AVIDSTOP));
end
end
endmodule
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