The data of overlapped characters and pictures are stored in the ROM of FPGA, The Times are generated by FPGA inner logic circuit to control the switch of TV channels to finish the overlapping work.

该方案将被叠加的字符或图像数据保存在FPGA内部的ROM中，由内部逻辑控制电路产生点阵时序，控制视频通道切换开关，完成叠加功能。

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FPGA is used to achieve the complex and high-speed logic control and the design of time sequence, with grabbed digital video signal cut and stored in SRAM, under the principles of the video signal.

利用FPGA完成复杂且高速的逻辑控制及时序设计，将采集的图像根据视频信号原理进行裁剪并存储在SRAM中。

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When the threshold voltage is negative and a read is attempted by applying 0 V to the control gate, the memory element will turn on to indicate logic one is being stored.

当阈值电压为负且通过向控制栅极施加0V来尝试读取时，存储器元件将接通以指示正在存储逻辑1。

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