55 lines
1.7 KiB
Systemverilog
55 lines
1.7 KiB
Systemverilog
module chip8 (
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input wire clk_in
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);
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bit [31:0] vram [0:2047];
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bit [7:0] memory [0:4095];
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bit keyboard [15:0];
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bit [7:0] sound_timer;
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bit [15:0] program_counter;
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int cycle_counter;
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bit [7:0] random_number;
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beeper beeper (sound_timer);
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cpu cpu (memory, clk_in, keyboard, random_number, cycle_counter, program_counter, vram, sound_timer);
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gpu gpu (vram);
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keyboard kb (clk_in, keyboard);
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rng randy (clk_in, program_counter, keyboard, cycle_counter, random_number);
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rom_loader loader (memory);
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initial begin
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bit [7:0] fontset [79:0] = {
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8'hF0, 8'h90, 8'h90, 8'h90, 8'hF0, // 0
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8'h20, 8'h60, 8'h20, 8'h20, 8'h70, // 1
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8'hF0, 8'h10, 8'hF0, 8'h80, 8'hF0, // 2
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8'hF0, 8'h10, 8'hF0, 8'h10, 8'hF0, // 3
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8'h90, 8'h90, 8'hF0, 8'h10, 8'h10, // 4
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8'hF0, 8'h80, 8'hF0, 8'h10, 8'hF0, // 5
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8'hF0, 8'h80, 8'hF0, 8'h90, 8'hF0, // 6
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8'hF0, 8'h10, 8'h20, 8'h40, 8'h40, // 7
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8'hF0, 8'h90, 8'hF0, 8'h90, 8'hF0, // 8
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8'hF0, 8'h90, 8'hF0, 8'h10, 8'hF0, // 9
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8'hF0, 8'h90, 8'hF0, 8'h90, 8'h90, // A
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8'hE0, 8'h90, 8'hE0, 8'h90, 8'hE0, // B
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8'hF0, 8'h80, 8'h80, 8'h80, 8'hF0, // C
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8'hE0, 8'h90, 8'h90, 8'h90, 8'hE0, // D
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8'hF0, 8'h80, 8'hF0, 8'h80, 8'hF0, // E
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8'hF0, 8'h80, 8'hF0, 8'h80, 8'h80 // F
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};
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// Load fontset into memory
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for(int i = 0; i < 80; i++) begin
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memory[i] = fontset[79-i];
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end
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// Initialize keyboard bits
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for(int i = 0; i < 15; i++) begin
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keyboard[i] = 0;
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end
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end
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endmodule
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