МАРСОХОД

Open Source Hardware Project

Улучшенный модуль генерации синхросигналов VGA



///////////////////////////////////////////////////////////////
//module which generates video sync impulses
///////////////////////////////////////////////////////////////

module hvsync (
    // inputs:
    input wire reset,
input wire char_clock, // outputs:
output reg [7:0]char_count,
output reg [11:0]line_count,
output reg hsync,
output reg vsync,
output reg pre_visible
); //calculate visible screen area
always @*
begin pre_visible = ((char_count==131)|(char_count<99)) & (line_count<600); end //synchronous process always @(posedge char_clock or posedge reset)
begin if(reset)
begin hsync <= 1'b0; char_count <= 0; end else begin hsync <= (char_count >= 104) & (char_count < 120); if(char_count == 131)
char_count <= 0; else char_count <= char_count + 1'b1; end end always @(posedge char_clock or posedge reset)
begin if(reset)
begin vsync <= 1'b0; line_count <= 0; end else if(char_count == 104)
begin vsync <= (line_count >= 600) & (line_count < 604); if(line_count == 627)
line_count <= 0; else line_count <= line_count + 1'b1; end end

endmodule


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