这个程序，我仿真时给的输入从65开始依次加一，可是输出不是x，而是按照输入为1开始依次加一的输出，就是输出为0，,1,16,15.......这是怎么回事啊
module CBP_INTER_table(clk,value,CBP_INTER);
input clk;
input [7:0] value;
output [7:0] CBP_INTER;
reg [7:0] CBP_INTER;
always @(posedge clk)
begin
case(value)
8'd1:
CBP_INTER <= 0;
8'd2:
CBP_INTER <= 19;
8'd3:
CBP_INTER <= 16;
8'd4:
CBP_INTER <= 15;
8'd5:
CBP_INTER <= 18;
8'd6:
CBP_INTER <= 11;
8'd7:
CBP_INTER <= 31;
8'd8:
CBP_INTER <= 13;
8'd9:
CBP_INTER <= 17;
8'd10:
CBP_INTER <= 30;
8'd11:
CBP_INTER <= 12;
8'd12:
CBP_INTER <= 9;
8'd13:
CBP_INTER <= 10;
8'd14:
CBP_INTER <= 7;
8'd15:
CBP_INTER <= 8;
8'd16:
CBP_INTER <= 1;
8'd17:
CBP_INTER <= 4;
8'd18:
CBP_INTER <= 42;
8'd19:
CBP_INTER <= 38;
8'd20:
CBP_INTER <= 27;
8'd21:
CBP_INTER <= 39;
8'd22:
CBP_INTER <= 33;
8'd23:
CBP_INTER <= 59;
8'd24:
CBP_INTER <= 26;
8'd25:
CBP_INTER <= 40;
8'd26:
CBP_INTER <= 58;
8'd27:
CBP_INTER <= 35;
8'd28:
CBP_INTER <= 25;
8'd29:
CBP_INTER <= 29;
8'd30:
CBP_INTER <= 24;
8'd31:
CBP_INTER <= 28;
8'd32:
CBP_INTER <= 3;
8'd33:
CBP_INTER <= 5;
8'd34:
CBP_INTER <= 51;
8'd35:
CBP_INTER <= 52;
8'd36:
CBP_INTER <= 37;
8'd37:
CBP_INTER <= 50;
8'd38:
CBP_INTER <= 43;
8'd39:
CBP_INTER <= 63;
8'd40:
CBP_INTER <= 44;
8'd41:
CBP_INTER <= 53;
8'd42:
CBP_INTER <= 62;
8'd43:
CBP_INTER <= 48;