在ISE下仿真老是通不过！！为什么！！
本帖最后由 fpgaw 于 2010-11-19 18:45 编辑这是一个二进制的8X8的乘法器，请哪位帮忙看看！
module mul_ser (clk, x, a, y);
input clk;
inputx, a;
output y;
reg y;
always @(posedge clk)
begin : States
parameter s0=0, s1=1, s2=2;
reg count;
reg state;
reg p, t;
reg a_reg;
case (state)
s0 : begin
a_reg <= a;
state <= s1;
count = 0;
p <= 0;
t <= {{8{x}},x};
end
s1 : begin
if (count == 7)
state <= s2;
else
begin
if (a_reg == 1)
p <= p + t;
a_reg <= a_reg >> 1;
t <= t << 1;
count = count + 1;
state <= s1;
end
end
s2 : begin
y <= p;
state <= s0;
end
endcase
end
endmodule
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