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consistent naming and put person moving line at the top

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matt venn 2020-04-22 19:11:23 +02:00
parent 94ce8e1288
commit 68127a3706
1 changed files with 7 additions and 8 deletions
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15
docs/examples/puzzles/wolf_goat_cabbage.sv
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@ -10,29 +10,28 @@ module wolf_goat_cabbage (input clk, input w, g, c);
reg bank_w = 0; // wolf reg bank_w = 0; // wolf
reg bank_g = 0; // goat reg bank_g = 0; // goat
reg bank_c = 0; // cabbage reg bank_c = 0; // cabbage
reg bank_person = 0; // person who drives the boat reg bank_p = 0; // person who drives the boat
always @(posedge clk) begin always @(posedge clk) begin
// person travels and takes the selected item with him // person travels and takes the selected item with him
if (w && (bank_w == bank_person)) bank_w <= !bank_person; bank_p <= !bank_p;
if (g && (bank_g == bank_person)) bank_g <= !bank_person; if (w && (bank_w == bank_p)) bank_w <= !bank_p;
if (c && (bank_c == bank_person)) bank_c <= !bank_person; if (g && (bank_g == bank_p)) bank_g <= !bank_p;
bank_person <= !bank_person; if (c && (bank_c == bank_p)) bank_c <= !bank_p;
// maximum one of the control signals must be high // maximum one of the control signals must be high
assume (w+g+c <= 1); assume (w+g+c <= 1);
// we want wolf, goat, and cabbage on the 2nd river bank // we want wolf, goat, and cabbage on the 2nd river bank
// write a cover statement that will result in the desired combination
cover(bank_w == 1 && bank_g == 1 && bank_c == 1); cover(bank_w == 1 && bank_g == 1 && bank_c == 1);
// don't leave wolf and goat unattended // don't leave wolf and goat unattended
if (bank_w != bank_person) begin if (bank_w != bank_p) begin
assume (bank_w != bank_g); assume (bank_w != bank_g);
end end
// don't leave goat and cabbage unattended // don't leave goat and cabbage unattended
if (bank_g != bank_person) begin if (bank_g != bank_p) begin
assume (bank_g != bank_c); assume (bank_g != bank_c);
end end
end end