问号表达式

color_cntr <= lv ? (cmd ==8'b00000000)?color_cntr+'d1: (cmd ==8'b00000010)?12'h000: (cmd ==8'b00000100)?12'hfff: (cmd ==8'b00001000)?12'haaa: (cmd ==8'b00010000)? 12'h888:color_cntr+'d2: 0;