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marius_mtm |
`timescale 1ns / 1ps
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//////////////////////////////////////////////////////////////////////////////////
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// Company:
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// Engineer:
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//
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// Create Date: 18:14:24 03/08/2009
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// Design Name:
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// Module Name: board_move
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// Project Name: The FPGA Othello Game
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// Target Devices: spartan3E
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// Tool versions:
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// Description:
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//
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// Dependencies:
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//
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// Revision:
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// Revision 0.01 - File Created
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// Additional Comments:
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//
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//////////////////////////////////////////////////////////////////////////////////
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module board_move(clk, B, R, X, Y, player, MB, MR, RST);
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/* Input: Othello 64bit board R - red player, B - blue player*/
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input [63:0] R;
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input [63:0] B;
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/* Input: clock signal */
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input clk;
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/* Input: reset signal: initializes FSM adn outputs */
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input RST;
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/* Input: X, Y coordinates in Othello board 8x8 */
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input [2:0] X;
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input [2:0] Y;
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/* Input: current player color RED or BLUE */
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input player;
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/* Output: New 64bit Othello board for BLUE player (MB) and for RED player (MR)*/
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output [63:0] MB;
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output [63:0] MR;
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/* internal: flip-flops */
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/*
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reg [7:0] oponent_ff_d[7:0];
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reg [7:0] current_ff_d[7:0];
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reg [7:0] oponent_ff_q[7:0];
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reg [7:0] current_ff_q[7:0];
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*/
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reg [63:0] oponent_ff_d;
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reg [63:0] current_ff_d;
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reg [63:0] oponent_ff_q;
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reg [63:0] current_ff_q;
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reg [2:0] countx_ff_d;
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reg [2:0] countx_ff_q;
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reg [2:0] county_ff_d;
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reg [2:0] county_ff_q;
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reg [2:0] count2x_ff_d;
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reg [2:0] count2x_ff_q;
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reg [2:0] count2y_ff_d;
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reg [2:0] count2y_ff_q;
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/* internal: FSM state ff */
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reg [1:0] state_ff_q;
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reg [1:0] state_ff_d;
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reg [1:0] state2_ff_q;
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reg [1:0] state2_ff_d;
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/* internal: FSM states */
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parameter RESET = 2'b00;
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parameter FLIP = 2'b01;
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parameter WRONG = 2'b10;
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parameter FINISH = 2'b11;
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/* constants */
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parameter DISC_ON = 1'b1;
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parameter DISC_OFF = 1'b0;
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parameter LIMIT = 3'd7;
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parameter NO_DISC = 1'b0;
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parameter RED = 1'b1;
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/* FSM Output logic */
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always @(state_ff_q or countx_ff_q or county_ff_q)
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begin
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/* oponent */
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oponent_ff_d = oponent_ff_q;
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/* current player */
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current_ff_d = current_ff_q;
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case (state_ff_q)
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/* FLIP state: flip the pieces */
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FLIP: begin
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/* oponent will remain with no disc on that position */
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oponent_ff_d[county_ff_q*8 + countx_ff_q] = DISC_OFF;
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/* disc is ours */
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current_ff_d[county_ff_q*8 + countx_ff_q] = DISC_ON;
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end
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/* WRONG state: flip back the pieces */
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WRONG: begin
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/* give the disc back to oponent */
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oponent_ff_d[county_ff_q*8 + countx_ff_q] = DISC_ON;
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current_ff_d[county_ff_q*8 + countx_ff_q] = DISC_OFF;
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end
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/* mantain the outputs */
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default: begin
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oponent_ff_d = oponent_ff_q;
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current_ff_d = current_ff_q;
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end
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endcase
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case (state2_ff_q)
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/* FLIP state: flip the pieces */
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FLIP: begin
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/* oponent will remain with no disc on that position */
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oponent_ff_d[count2y_ff_q*8 + count2x_ff_q] = DISC_OFF;
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/* disc is ours */
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current_ff_d[count2y_ff_q*8 + count2x_ff_q] = DISC_ON;
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end
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/* WRONG state: flip back the pieces */
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WRONG: begin
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/* give the disc back to oponent */
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oponent_ff_d[count2y_ff_q*8 + count2x_ff_q] = DISC_ON;
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current_ff_d[count2y_ff_q*8 + count2x_ff_q] = DISC_OFF;
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end
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/* mantain the outputs */
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default: begin
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oponent_ff_d = oponent_ff_q;
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current_ff_d = current_ff_q;
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end
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endcase
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end
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/* FSM next state logic */
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always @(state_ff_q or countx_ff_q or county_ff_q)
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begin
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case (state_ff_q)
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/* RESET state, prepare to flip the discs */
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RESET: begin
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if ( (oponent_ff_q[county_ff_q*8 + countx_ff_q] | current_ff_q[county_ff_q*8 + countx_ff_q]) == NO_DISC )
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/* if the square is empty */
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begin
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if ( countx_ff_q == LIMIT )
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/* if this is the last square, nothing to flip on this direction */
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begin
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state_ff_d = FINISH;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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else begin
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if ( oponent_ff_q[county_ff_q*8 + countx_ff_q + 1] == DISC_ON )
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/* check if there is an oponent disc */
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begin
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/* yes, go to FLIP state, and increment X */
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state_ff_d = FLIP;
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countx_ff_d = countx_ff_q + 1;
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county_ff_d = county_ff_q;
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end
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else begin
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/* if no, means that we have nothing to flip => FINISH */
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state_ff_d = FINISH;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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end
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end
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else begin
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/* error: should happen */
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state_ff_d = RESET;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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end
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/* FLIP state: in this state we flip the discs, and see if we still have to flip or we are finished */
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FLIP: begin
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if (countx_ff_q == LIMIT) begin
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/* if we are here, it means that we have no disc to flanc with */
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state_ff_d = WRONG;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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else begin
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if ( oponent_ff_q[county_ff_q*8 + countx_ff_q + 1] == DISC_ON )
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/* if next to us is an oponent disc, mantain FLIP */
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begin
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state_ff_d = state_ff_q;
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countx_ff_d = countx_ff_q + 1;
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county_ff_d = county_ff_q;
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end
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else begin
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if ( current_ff_q[county_ff_q*8 + countx_ff_q + 1] == DISC_ON )
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/* if it's our color the disc next to us, we can flanc all the oponent discs, so we are finish */
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begin
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state_ff_d = FINISH;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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else begin
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/* if it's niether our disc or oponent's disc, means square is empty, so nothing to flip */
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state_ff_d = WRONG;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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end
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end
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end
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/* WRONG state: we flip the discs back in this state */
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WRONG:
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begin
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if (countx_ff_q - 1 == X)
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/* check if we are finished */
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begin
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state_ff_d = FINISH;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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else begin
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/* we mantain the state, keep flipping back */
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state_ff_d = WRONG;
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countx_ff_d = countx_ff_q - 1;
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county_ff_d = county_ff_q;
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end
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end
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/* default state, mantain counters and state */
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default:
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begin
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state_ff_d = state_ff_q;
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countx_ff_d = countx_ff_q;
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county_ff_d = county_ff_q;
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end
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endcase
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end
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/* FSM next state logic */
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always @(state2_ff_q or count2x_ff_q or count2y_ff_q)
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begin
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case (state2_ff_q)
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/* RESET state, prepare to flip the discs */
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RESET: begin
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if ( (oponent_ff_q[count2y_ff_q*8 + count2x_ff_q] | current_ff_q[count2y_ff_q*8 + count2x_ff_q]) == NO_DISC )
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/* if the square is empty */
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begin
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if ( count2x_ff_q == LIMIT )
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/* if this is the last square, nothing to flip on this direction */
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begin
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state2_ff_d = FINISH;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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end
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else begin
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if ( oponent_ff_q[count2y_ff_q*8 + count2x_ff_q - 1] == DISC_ON )
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/* check if there is an oponent disc */
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begin
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/* yes, go to FLIP state, and increment X */
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state2_ff_d = FLIP;
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count2x_ff_d = count2x_ff_q - 1;
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count2y_ff_d = count2y_ff_q;
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end
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else begin
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/* if no, means that we have nothing to flip => FINISH */
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state2_ff_d = FINISH;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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end
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end
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end
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else begin
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/* error: should happen */
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state2_ff_d = RESET;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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end
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end
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/* FLIP state: in this state we flip the discs, and see if we still have to flip or we are finished */
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FLIP: begin
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if (count2x_ff_q == 3'b0) begin
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/* if we are here, it means that we have no disc to flanc with */
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state2_ff_d = WRONG;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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end
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else begin
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if ( oponent_ff_q[count2y_ff_q*8 + count2x_ff_q - 1] == DISC_ON )
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/* if next to us is an oponent disc, mantain FLIP */
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begin
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state2_ff_d = state2_ff_q;
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count2x_ff_d = count2x_ff_q + 1;
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count2y_ff_d = count2y_ff_q;
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end
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else begin
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if ( current_ff_q[count2y_ff_q*8 + count2x_ff_q - 1] == DISC_ON )
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/* if it's our color the disc next to us, we can flanc all the oponent discs, so we are finish */
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| 315 |
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begin
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| 316 |
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state2_ff_d = FINISH;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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end
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| 320 |
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else begin
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/* if it's niether our disc or oponent's disc, means square is empty, so nothing to flip */
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| 322 |
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state2_ff_d = WRONG;
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count2x_ff_d = count2x_ff_q;
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count2y_ff_d = count2y_ff_q;
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| 325 |
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end
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| 326 |
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end
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end
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end
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| 329 |
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/* WRONG state: we flip the discs back in this state */
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WRONG:
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| 331 |
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begin
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| 332 |
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if (count2x_ff_q + 1 == X)
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/* check if we are finished */
|
| 334 |
|
|
begin
|
| 335 |
|
|
state2_ff_d = FINISH;
|
| 336 |
|
|
count2x_ff_d = count2x_ff_q;
|
| 337 |
|
|
count2y_ff_d = count2y_ff_q;
|
| 338 |
|
|
end
|
| 339 |
|
|
else begin
|
| 340 |
|
|
/* we mantain the state, keep flipping back */
|
| 341 |
|
|
state2_ff_d = WRONG;
|
| 342 |
|
|
count2x_ff_d = count2x_ff_q + 1;
|
| 343 |
|
|
count2y_ff_d = count2y_ff_q;
|
| 344 |
|
|
end
|
| 345 |
|
|
end
|
| 346 |
|
|
|
| 347 |
|
|
/* default state, mantain counters and state */
|
| 348 |
|
|
default:
|
| 349 |
|
|
begin
|
| 350 |
|
|
state2_ff_d = state2_ff_q;
|
| 351 |
|
|
count2x_ff_d = count2x_ff_q;
|
| 352 |
|
|
count2y_ff_d = count2y_ff_q;
|
| 353 |
|
|
end
|
| 354 |
|
|
endcase
|
| 355 |
|
|
end
|
| 356 |
|
|
|
| 357 |
|
|
|
| 358 |
|
|
|
| 359 |
|
|
/* clocked procedure */
|
| 360 |
|
|
always @(posedge clk)
|
| 361 |
|
|
begin
|
| 362 |
|
|
if (RST)
|
| 363 |
|
|
/* reset signal */
|
| 364 |
|
|
begin
|
| 365 |
|
|
state_ff_q <= RESET;
|
| 366 |
|
|
state2_ff_q <= RESET;
|
| 367 |
|
|
/* we prepare the board */
|
| 368 |
|
|
current_ff_q <= B;
|
| 369 |
|
|
oponent_ff_q <= R;
|
| 370 |
|
|
|
| 371 |
|
|
/* if second player is the current one, switch the matrices */
|
| 372 |
|
|
if ( player == RED ) begin
|
| 373 |
|
|
current_ff_q <= R;
|
| 374 |
|
|
oponent_ff_q <= B;
|
| 375 |
|
|
|
| 376 |
|
|
|
| 377 |
|
|
end
|
| 378 |
|
|
|
| 379 |
|
|
/* prepare the counters (directions) */
|
| 380 |
|
|
countx_ff_q <= X;
|
| 381 |
|
|
county_ff_q <= Y;
|
| 382 |
|
|
|
| 383 |
|
|
count2x_ff_q <= X;
|
| 384 |
|
|
count2y_ff_q <= Y;
|
| 385 |
|
|
|
| 386 |
|
|
end
|
| 387 |
|
|
else begin
|
| 388 |
|
|
/* go to next state */
|
| 389 |
|
|
state_ff_q <= state_ff_d;
|
| 390 |
|
|
|
| 391 |
|
|
/* go to next square */
|
| 392 |
|
|
countx_ff_q <= countx_ff_d;
|
| 393 |
|
|
county_ff_q <= county_ff_d;
|
| 394 |
|
|
|
| 395 |
|
|
state2_ff_q <= state2_ff_d;
|
| 396 |
|
|
|
| 397 |
|
|
/* go to next square */
|
| 398 |
|
|
count2x_ff_q <= count2x_ff_d;
|
| 399 |
|
|
count2y_ff_q <= count2y_ff_d;
|
| 400 |
|
|
|
| 401 |
|
|
|
| 402 |
|
|
/* validate outputs */
|
| 403 |
|
|
oponent_ff_q <= oponent_ff_d;
|
| 404 |
|
|
current_ff_q <= current_ff_d;
|
| 405 |
|
|
|
| 406 |
|
|
end
|
| 407 |
|
|
end
|
| 408 |
|
|
|
| 409 |
|
|
|
| 410 |
|
|
/* continuous assignments, output Othello board 128bit */
|
| 411 |
|
|
assign MB = current_ff_q;
|
| 412 |
|
|
assign MR = oponent_ff_q;
|
| 413 |
|
|
|
| 414 |
|
|
endmodule
|
