1请求解决Verilog中Can't resolve multiple constant drivers for net "duty_cycle[2]" at pwm.v 语法错误我想用两个按键改变一个寄存器变量duty_cycle的值,其中一个每按一次加1,加到6后不再改变,另一个是每按一次减1,减到0后不再改变.我是这样写的:reg [2:0] duty_cycle = 0;always @(posedge key...