lemming games 1!! hdlbits

hdlbits
Lemmings1
旅鼠游戏有四个系列
系列1：

module top_module(
input clk,
input areset, // Freshly brainwashed Lemmings walk left.
input bump_left,
input bump_right,
output walk_left,
output walk_right); //

parameter LEFT=0, RIGHT=1;
reg state, next_state;
always @(*) begincase(state)LEFT: if((bump_left==1)&&(bump_right==0))next_state=RIGHT;else if((bump_right==1)&&(bump_left==0))next_state=LEFT;else if((bump_left==1)&&(bump_right==1))next_state=RIGHT;elsenext_state=LEFT;RIGHT: if((bump_left==1)&&(bump_right==0))next_state=RIGHT;else if((bump_right==1)&&(bump_left==0))next_state=LEFT;else if((bump_left==1)&&(bump_right==1))next_state=LEFT;elsenext_state=RIGHT;endcase// State transition logic
endalways @(posedge clk, posedge areset) beginif(areset)state<=LEFT;   elsestate<=next_state;// State flip-flops with asynchronous reset
end
assign walk_left=(state==LEFT)?1:0;
assign walk_right=(state==RIGHT)?1:0;
// Output logic
// assign walk_left = (state == ...);
// assign walk_right = (state == ...);

endmodule
系列2
在系列1的基础上增加了掉落的功能，所以在系列1的基础上增加两个状态，由于掉落之后，一旦出现地，要回到原来的方向，因此需要增加从左侧掉落和从右侧掉落，共四个状态

module top_module(
input clk,
input areset, // Freshly brainwashed Lemmings walk left.
input bump_left,
input bump_right,
input ground,
output walk_left,
output walk_right,
output aaah );

  localparam left = 0;
localparam right = 1;
localparam fall_l = 2;
localparam fall_r = 3;reg[1:0] state, next_state;
reg[2:0] out;
always @(posedge clk or posedge areset)beginif(areset)    state<=left;elsestate<=next_state;end
always @(*)begincase(state)   left: next_state=ground?(bump_left?right:left):fall_l;right:next_state=ground?(bump_right?left:right):fall_r;fall_l:next_state=ground?left:fall_l;fall_r:next_state=ground?right:fall_r;endcaseend
always @(posedge clk or posedge areset)beginif(areset)out<=3'b100;elsecase(next_state)left: out<=3'b100;right: out<=3'b010;fall_l: out<=3'b001;fall_r: out<=3'b001;endcaseend
assign {walk_left,walk_right,aaah}=out;

endmodule

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