说明：  PXA255外围扩展功能，使用LC4256-176TQFP。扩展了CF卡、分时复用串口、电源管理、键盘等接口/功能。
(PXA255 external expansion function, use the LC4256-176TQFP. Expansion of the CF card, time-sharing multiplexed serial port, power management, keyboard interface/functionality.)