在nexys3上从pmod开启不起作用

大家好，
我试图通过pmod打开LED。
但它不起作用。
我正在使用nexys3板。
这是verilog代码：
模块TestWheelDriver（输出ain1，ain2）;
分配ain1 = 1'b1;
分配ain2 = 1'b0;
endmodule
这是ucf文件中我在JA上更改引脚连接的部分。
## JANET“ain1”LOC =“T12”|
IOSTANDARD =“LVCMOS33”;
#Bank = 2，Pin name = IO_L19P，Sch name = JA1NET“ain2”LOC =“V12”|
IOSTANDARD =“LVCMOS33”;
#Bank = 2，Pin name = IO_L19N，Sch name = JA2
我有两条线连接到JA上的引脚1和引脚2。
这些电线通过490欧姆电阻连接到LED。
我预计会开启。
但它没有开启。
请任何人都可以帮助我理解为什么这不起作用以及如何使其工作。



以下为原文

Hi All,
I am trying to turn on an LED via pmod. but it is not working. i am using nexys3 board.
Here is verilog code:

module TestWheelDriver(
output ain1, ain2
);
assign ain1 = 1'b1;
assign ain2 = 1'b0;
endmodule

Here is the part of ucf file where i change pin connection on JA.
##JA
NET "ain1" LOC = "T12" | IOSTANDARD = "LVCMOS33"; #Bank = 2, Pin name = IO_L19P, Sch name = JA1
NET "ain2" LOC = "V12" | IOSTANDARD = "LVCMOS33"; #Bank = 2, Pin name = IO_L19N, Sch name = JA2


i have two wires connected to pin 1 and pin 2 on JA.
these wires go to LED via 490 ohm resistor.

i expected led to turn on. but it is not turning on.
please can anyone help me understand why this is not working and how to make it work.