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我有一點問題。我想做一個用固定點來分兩個數字的程序。我的輸出看起來不錯，但是當我在 本地測試網站上測試程序時，我得到了一些奇怪的結果。有人可以幫助我嗎？謝謝。定點除數
module divider(
input[7:0] a,b,
output reg [15:0] q,
output reg [7:0] r,frac
);
reg[7:0] c2, r2;
integer c;
always @(*)
begin
c = 8'b00000000;
r = a;
frac = 8'b00000000;
repeat (30)
begin
if (r >= b)
begin
c = c + 1;
r = r - b;
end
end
q[15:8] = c;
repeat (8)
begin
if(r != 0)
begin
r = r*10;
c2 = 8'b00000000;
repeat(30)
begin
if (r>=b)
begin
c2 = c2 + 1;
r = r-b;
end
end
frac = frac*10 + c2;
end
end
q[7:0] = frac;
end
endmodule
輸出本地站點：
error: a = 1, b = 2, q = 0.019531, expected q = 0.500000
error: a = 1, b = 4, q = 0.097656, expected q = 0.250000
error: a = 1, b = 5, q = 0.007813, expected q = 0.199219
error: a = 1, b = 7, q = 0.570313, expected q = 0.140625
error: a = 1, b = 8, q = 0.488281, expected q = 0.125000
error: a = 1, b = 9, q = 0.777344, expected q = 0.109375
error: a = 1, b = 10, q = 0.003906, expected q = 0.097656
error: a = 1, b = 11, q = 0.363281, expected q = 0.089844
error: a = 1, b = 14, q = 0.785156, expected q = 0.070313
error: a = 1, b = 15, q = 0.664063, expected q = 0.066406
error: a = 1, b = 16, q = 0.441406, expected q = 0.062500
error: a = 1, b = 17, q = 0.937500, expected q = 0.058594
error: a = 1, b = 18, q = 0.386719, expected q = 0.054688
error: a = 1, b = 19, q = 0.207031, expected q = 0.050781
error: a = 1, b = 20, q = 0.019531, expected q = 0.046875
error: a = 1, b = 21, q = 0.187500, expected q = 0.046875
error: a = 1, b = 22, q = 0.679688, expected q = 0.042969
error: a = 1, b = 23, q = 0.695313, expected q = 0.042969
error: a = 1, b = 25, q = 0.015625, expected q = 0.039063
error: a = 1, b = 27, q = 0.589844, expected q = 0.035156
error: a = 1, b = 28, q = 0.890625, expected q = 0.035156
error: a = 1, b = 29, q = 0.824219, expected q = 0.031250
error: a = 1, b = 30, q = 0.832031, expected q = 0.031250
error: a = 1, b = 31, q = 0.804688, expected q = 0.031250
error: a = 1, b = 32, q = 0.207031, expected q = 0.031250
error: a = 1, b = 33, q = 0.121094, expected q = 0.027344
error: a = 1, b = 34, q = 0.437500, expected q = 0.027344
error: a = 1, b = 35, q = 0.570313, expected q = 0.027344
error: a = 1, b = 36, q = 0.914063, expected q = 0.027344
error: a = 1, b = 37, q = 0.000000, expected q = 0.023438
error: a = 1, b = 38, q = 0.339844, expected q = 0.023438
error: a = 1, b = 40, q = 0.097656, expected q = 0.023438
不是100％確定該算法是如何支持工作的;但是如果你通過你的第一個例子，你會發現生成的'q'從你正在做的事情中是有意義的。請注意，這種設計描述了完全可能是或不是您的意圖的組合邏輯。我不知道你從哪裏得到'repeat（30）'，從例子中你可以看到'a = 8'd100'，'b = 8'd2'，'c'在第一個循環結束時會是30將不會做足夠的連續減法。另外請注意，固定點通常是基數2，而不是基數10，因爲您在這裏（'fact = fact * 10 + c2'）。 – Unn