Maximum refresh rate of the video controller in Hertz.
该视频控制器的以赫兹表示的最大刷新速率。
The refresh cycles are usually performed by a peripheral called a DRAM controller.
刷新周期一般由一个叫DRAM控制器的外设完成。
It is mainly composed of DMA controller (82c37), interrupt controller (82c59), programmable interval timers (82c54), DRAM refresh control, wait state generator and system reset logic.
其内部主要由DMA控制器(82c37)、中断控制器(82c59)、可编程间隔计时器(82c54)，DRAM刷新控制器，等待状态产生器，系统重置电路组成。
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