?? vga_pgen.v
字號:
//synopsys translate_off
`include "timescale.v"
//synopsys translate_on
`include "vga_defines.v"
module vga_pgen (
clk_i, ctrl_ven, ctrl_HSyncL, Thsync, Thgdel, Thgate, Thlen,
ctrl_VSyncL, Tvsync, Tvgdel, Tvgate, Tvlen, ctrl_CSyncL, ctrl_BlankL,
eoh, eov,
ctrl_dvi_odf, ctrl_cd, ctrl_pc,
fb_data_fifo_rreq, fb_data_fifo_empty, fb_data_fifo_q, ImDoneFifoQ,
stat_acmp, clut_req, clut_adr, clut_q, clut_ack, ctrl_cbsw, clut_switch,
cursor_adr,
cursor0_en, cursor0_res, cursor0_xy, cc0_adr_o, cc0_dat_i,
cursor1_en, cursor1_res, cursor1_xy, cc1_adr_o, cc1_dat_i,
line_fifo_wreq, line_fifo_full, line_fifo_d, line_fifo_rreq, line_fifo_q,
pclk_i,
`ifdef VGA_12BIT_DVI
dvi_pclk_p_o, dvi_pclk_m_o, dvi_hsync_o, dvi_vsync_o, dvi_de_o, dvi_d_o,
`endif
pclk_o, hsync_o, vsync_o, csync_o, blank_o, r_o, g_o, b_o
);
// inputs & outputs
input clk_i; // master clock
input ctrl_ven; // Video enable signal
// horiontal timing settings
input ctrl_HSyncL; // horizontal sync pulse polarization level (pos/neg)
input [ 7:0] Thsync; // horizontal sync pulse width (in pixels)
input [ 7:0] Thgdel; // horizontal gate delay (in pixels)
input [15:0] Thgate; // horizontal gate length (number of visible pixels per line)
input [15:0] Thlen; // horizontal length (number of pixels per line)
// vertical timing settings
input ctrl_VSyncL; // vertical sync pulse polarization level (pos/neg)
input [ 7:0] Tvsync; // vertical sync pulse width (in lines)
input [ 7:0] Tvgdel; // vertical gate delay (in lines)
input [15:0] Tvgate; // vertical gate length (number of visible lines in frame)
input [15:0] Tvlen; // vertical length (number of lines in frame)
// composite signals
input ctrl_CSyncL; // composite sync pulse polarization level
input ctrl_BlankL; // blank signal polarization level
// status outputs
output eoh; // end of horizontal
reg eoh;
output eov; // end of vertical;
reg eov;
// Pixel signals
input [ 1: 0] ctrl_dvi_odf;
input [ 1: 0] ctrl_cd;
input ctrl_pc;
input [31: 0] fb_data_fifo_q;
input fb_data_fifo_empty;
output fb_data_fifo_rreq;
input ImDoneFifoQ;
output stat_acmp; // active CLUT memory page
reg stat_acmp;
output clut_req;
output [ 8: 0] clut_adr;
input [23: 0] clut_q;
input clut_ack;
input ctrl_cbsw; // enable clut bank switching
output clut_switch; // clut memory bank-switch request: clut page switched (when enabled)
input [ 8: 0] cursor_adr; // cursor data address (from wbm)
input cursor0_en; // enable hardware cursor0
input cursor0_res; // cursor0 resolution
input [31: 0] cursor0_xy; // (x,y) address hardware cursor0
output [ 3: 0] cc0_adr_o; // cursor0 color registers address output
input [15: 0] cc0_dat_i; // cursor0 color registers data input
input cursor1_en; // enable hardware cursor1
input cursor1_res; // cursor1 resolution
input [31: 0] cursor1_xy; // (x,y) address hardware cursor1
output [ 3: 0] cc1_adr_o; // cursor1 color registers address output
input [15: 0] cc1_dat_i; // cursor1 color registers data input
input line_fifo_full;
output line_fifo_wreq;
output [23: 0] line_fifo_d;
output line_fifo_rreq;
input [23: 0] line_fifo_q;
// pixel clock related outputs
input pclk_i; // pixel clock in
output pclk_o; // pixel clock out
output hsync_o; // horizontal sync pulse
output vsync_o; // vertical sync pulse
output csync_o; // composite sync: Hsync OR Vsync (logical OR function)
output blank_o; // blanking signal
output [ 7:0] r_o, g_o, b_o;
reg hsync_o, vsync_o, csync_o, blank_o;
reg [7:0] r_o, g_o, b_o;
`ifdef VGA_12BIT_DVI
output dvi_pclk_p_o; // dvi pclk+
output dvi_pclk_m_o; // dvi pclk-
output dvi_hsync_o; // dvi hsync
output dvi_vsync_o; // dvi vsync
output dvi_de_o; // dvi data enable
output [11:0] dvi_d_o; // dvi 12bit output
`endif
//
// variable declarations
//
reg nVen; // video enable signal (active low)
wire eol, eof;
wire ihsync, ivsync, icsync, iblank;
wire pclk_ena;
//////////////////////////////////
//
// module body
//
// synchronize timing/control settings (from master-clock-domain to pixel-clock-domain)
always @(posedge pclk_i)
nVen <= #1 ~ctrl_ven;
//////////////////////////////////
//
// Pixel Clock generator
//
vga_clkgen clk_gen(
.pclk_i ( pclk_i ),
.rst_i ( nVen ),
.pclk_o ( pclk_o ),
.dvi_pclk_p_o ( dvi_pclk_p_o ),
.dvi_pclk_m_o ( dvi_pclk_m_o ),
.pclk_ena_o ( pclk_ena )
);
//////////////////////////////////
//
// Timing generator
//
// hookup video timing generator
vga_tgen vtgen(
.clk(pclk_i),
.clk_ena ( pclk_ena ),
.rst ( nVen ),
.Thsync ( Thsync ),
.Thgdel ( Thgdel ),
.Thgate ( Thgate ),
.Thlen ( Thlen ),
.Tvsync ( Tvsync ),
.Tvgdel ( Tvgdel ),
.Tvgate ( Tvgate ),
.Tvlen ( Tvlen ),
.eol ( eol ),
.eof ( eof ),
.gate ( gate ),
.hsync ( ihsync ),
.vsync ( ivsync ),
.csync ( icsync ),
.blank ( iblank )
);
//
// from pixel-clock-domain to master-clock-domain
//
reg seol, seof; // synchronized end-of-line, end-of-frame
reg dseol, dseof; // delayed seol, seof
always @(posedge clk_i)
if (~ctrl_ven)
begin
seol <= #1 1'b0;
dseol <= #1 1'b0;
seof <= #1 1'b0;
dseof <= #1 1'b0;
eoh <= #1 1'b0;
eov <= #1 1'b0;
end
else
begin
seol <= #1 eol;
dseol <= #1 seol;
seof <= #1 eof;
dseof <= #1 seof;
eoh <= #1 seol & !dseol;
eov <= #1 seof & !dseof;
end
always @(posedge pclk_i)
if (pclk_ena)
begin
hsync_o <= #1 ihsync ^ ctrl_HSyncL;
vsync_o <= #1 ivsync ^ ctrl_VSyncL;
csync_o <= #1 icsync ^ ctrl_CSyncL;
blank_o <= #1 iblank ^ ctrl_BlankL;
end
//////////////////////////////////
//
// Pixel generator section
//
wire [23:0] color_proc_q; // data from color processor
wire color_proc_wreq;
wire [ 7:0] clut_offs; // color lookup table offset
wire ImDoneFifoQ;
reg dImDoneFifoQ, ddImDoneFifoQ;
wire [23:0] cur1_q;
wire cur1_wreq;
wire [23:0] rgb_fifo_d;
wire rgb_fifo_empty, rgb_fifo_full, rgb_fifo_rreq, rgb_fifo_wreq;
wire sclr = ~ctrl_ven;
//
// hookup color processor
vga_colproc color_proc (
.clk ( clk_i ),
.srst ( sclr ),
.vdat_buffer_di ( fb_data_fifo_q ), //data_fifo_q),
.ColorDepth ( ctrl_cd ),
.PseudoColor ( ctrl_pc ),
.vdat_buffer_empty ( fb_data_fifo_empty ), //data_fifo_empty),
.vdat_buffer_rreq ( fb_data_fifo_rreq ), //data_fifo_rreq),
.rgb_fifo_full ( rgb_fifo_full ),
.rgb_fifo_wreq ( color_proc_wreq ),
.r ( color_proc_q[23:16] ),
.g ( color_proc_q[15: 8] ),
.b ( color_proc_q[ 7: 0] ),
.clut_req ( clut_req ),
.clut_ack ( clut_ack ),
.clut_offs ( clut_offs ),
.clut_q ( clut_q )
);
//
// clut bank switch / cursor data delay2: Account for ColorProcessor DataBuffer delay
always @(posedge clk_i)
if (sclr)
dImDoneFifoQ <= #1 1'b0;
else if (fb_data_fifo_rreq)
dImDoneFifoQ <= #1 ImDoneFifoQ;
always @(posedge clk_i)
if (sclr)
ddImDoneFifoQ <= #1 1'b0;
else
ddImDoneFifoQ <= #1 dImDoneFifoQ;
assign clut_switch = ddImDoneFifoQ & !dImDoneFifoQ;
always @(posedge clk_i)
if (sclr)
stat_acmp <= #1 1'b0;
else if (ctrl_cbsw)
stat_acmp <= #1 stat_acmp ^ clut_switch; // select next clut when finished reading clut for current video bank (and bank switch enabled)
// generate clut-address
assign clut_adr = {stat_acmp, clut_offs};
//
// hookup data-source-selector && hardware cursor module
`ifdef VGA_HWC1 // generate Hardware Cursor1 (if enabled)
wire cursor1_ld_strb;
reg scursor1_en;
reg scursor1_res;
reg [31:0] scursor1_xy;
assign cursor1_ld_strb = ddImDoneFifoQ & !dImDoneFifoQ;
always @(posedge clk_i)
if (sclr)
scursor1_en <= #1 1'b0;
else if (cursor1_ld_strb)
scursor1_en <= #1 cursor1_en;
always @(posedge clk_i)
if (cursor1_ld_strb)
scursor1_xy <= #1 cursor1_xy;
always @(posedge clk_i)
if (cursor1_ld_strb)
scursor1_res <= #1 cursor1_res;
vga_curproc hw_cursor1 (
.clk ( clk_i ),
.rst_i ( sclr ),
.Thgate ( Thgate ),
.Tvgate ( Tvgate ),
.idat ( color_proc_q ),
.idat_wreq ( color_proc_wreq ),
.cursor_xy ( scursor1_xy ),
.cursor_res ( scursor1_res ),
.cursor_en ( scursor1_en ),
.cursor_wadr ( cursor_adr ),
.cursor_we ( cursor1_we ),
.cursor_wdat ( dat_i ),
.cc_adr_o ( cc1_adr_o ),
.cc_dat_i ( cc1_dat_i ),
.rgb_fifo_wreq ( cur1_wreq ),
.rgb ( cur1_q )
);
`ifdef VGA_HWC0 // generate additional signals for Hardware Cursor0 (if enabled)
reg sddImDoneFifoQ, sdImDoneFifoQ;
always @(posedge clk_i)
if (cur1_wreq)
begin
sdImDoneFifoQ <= #1 dImDoneFifoQ;
sddImDoneFifoQ <= #1 sdImDoneFifoQ;
end
`endif
`else // Hardware Cursor1 disabled, generate pass-through signals
assign cur1_wreq = color_proc_wreq;
assign cur1_q = color_proc_q;
assign cc1_adr_o = 4'h0;
`ifdef VGA_HWC0 // generate additional signals for Hardware Cursor0 (if enabled)
wire sddImDoneFifoQ, sdImDoneFifoQ;
assign sdImDoneFifoQ = dImDoneFifoQ;
assign sddImDoneFifoQ = ddImDoneFifoQ;
`endif
`endif
`ifdef VGA_HWC0 // generate Hardware Cursor0 (if enabled)
wire cursor0_ld_strb;
reg scursor0_en;
reg scursor0_res;
reg [31:0] scursor0_xy;
assign cursor0_ld_strb = sddImDoneFifoQ & !sdImDoneFifoQ;
always @(posedge clk_i)
if (sclr)
scursor0_en <= #1 1'b0;
else if (cursor0_ld_strb)
scursor0_en <= #1 cursor0_en;
always @(posedge clk_i)
if (cursor0_ld_strb)
scursor0_xy <= #1 cursor0_xy;
always @(posedge clk_i)
if (cursor0_ld_strb)
scursor0_res <= #1 cursor0_res;
vga_curproc hw_cursor0 (
.clk ( clk_i ),
.rst_i ( sclr ),
.Thgate ( Thgate ),
.Tvgate ( Tvgate ),
.idat ( ssel1_q ),
.idat_wreq ( ssel1_wreq ),
.cursor_xy ( scursor0_xy ),
.cursor_en ( scursor0_en ),
.cursor_res ( scursor0_res ),
.cursor_wadr ( cursor_adr ),
.cursor_we ( cursor0_we ),
.cursor_wdat ( dat_i ),
.cc_adr_o ( cc0_adr_o ),
.cc_dat_i ( cc0_dat_i ),
.rgb_fifo_wreq ( rgb_fifo_wreq ),
.rgb ( rgb_fifo_d )
);
`else // Hardware Cursor0 disabled, generate pass-through signals
assign rgb_fifo_wreq = cur1_wreq;
assign rgb_fifo_d = cur1_q;
assign cc0_adr_o = 4'h0;
`endif
//
// hookup RGB buffer (temporary station between WISHBONE-clock-domain
// and pixel-clock-domain)
// The cursor_processor pipelines introduce a delay between the color
// processor's rgb_fifo_wreq and the rgb_fifo_full signals. To compensate
// for this we double the rgb_fifo.
wire [3:0] rgb_fifo_nword;
vga_fifo #(4, 24) rgb_fifo (
.clk ( clk_i ),
.aclr ( 1'b1 ),
.sclr ( sclr ),
.d ( rgb_fifo_d ),
.wreq ( rgb_fifo_wreq ),
.q ( line_fifo_d ),
.rreq ( rgb_fifo_rreq ),
.empty ( rgb_fifo_empty ),
.nword ( rgb_fifo_nword ),
.full ( ),
.aempty ( ),
.afull ( )
);
assign rgb_fifo_full = rgb_fifo_nword[3];
assign line_fifo_rreq = gate & pclk_ena;
assign rgb_fifo_rreq = ~line_fifo_full & ~rgb_fifo_empty;
assign line_fifo_wreq = rgb_fifo_rreq;
wire [7:0] r = line_fifo_q[23:16];
wire [7:0] g = line_fifo_q[15: 8];
wire [7:0] b = line_fifo_q[ 7: 0];
always @(posedge pclk_i)
if (pclk_ena) begin
r_o <= #1 r;
g_o <= #1 g;
b_o <= #1 b;
end
//
// DVI section
//
`ifdef VGA_12BIT_DVI
reg [11:0] dvi_d_o;
reg dvi_de_o;
reg dvi_hsync_o;
reg dvi_vsync_o;
reg [11:0] pA, pB;
reg dgate, ddgate;
reg dhsync, ddhsync;
reg dvsync, ddvsync;
always @(posedge pclk_i)
if (pclk_ena)
case (ctrl_dvi_odf) // synopsys full_case parallel_case
2'b00: pA <= #1 {g[3:0], b[7:0]};
2'b01: pA <= #1 {g[4:2], b[7:3], g[0], b[2:0]};
2'b10: pA <= #1 {g[4:2], b[7:3], 4'h0};
2'b11: pA <= #1 {g[5:3], b[7:3], 4'h0};
endcase
always @(posedge pclk_i)
if (pclk_ena)
case (ctrl_dvi_odf) // synopsys full_case parallel_case
2'b00: pB <= #1 {r[7:0], g[7:4]};
2'b01: pB <= #1 {r[7:3], g[7:5], r[2:0], g[1]};
2'b10: pB <= #1 {r[7:3], g[7:5], 4'h0};
2'b11: pB <= #1 {1'b0, r[7:3], g[7:6], 4'h0};
endcase
always @(posedge pclk_i)
if (pclk_ena)
dvi_d_o <= #1 pB;
else
dvi_d_o <= #1 pA;
always @(posedge pclk_i)
if (pclk_ena) begin
dgate <= #1 gate; // delay once: delayed line fifo output
dhsync <= #1 ~ihsync;
ddhsync <= #1 dhsync;
dvsync <= #1 ~ivsync;
ddvsync <= #1 dvsync;
end
always @(posedge pclk_i)
begin
dvi_de_o <= #1 dgate;
dvi_hsync_o <= #1 dhsync;
dvi_vsync_o <= #1 dvsync;
end
`endif
endmodule
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