The display property is set to none to hide the control and to block to display the list.
display属性设置为none以隐藏控件，设置为block时则会显示列表。
Based on the control block of LED display driving chip, the control codes in SDRAM are also given out in the appendix of the dissertaion.
基于LED大屏显示系统和驱动芯片，而设计了的控制模块，并在附录一给出了控制用SDRAM的代码实现方式。
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