falling edge meaning in English

下建边缘

Falling edge of sync signal programmable frequency
同步信号下降沿可编程频率
Falling edge of sync signal programmable
同步信号的下降沿可编程
Rising falling edge
上升下降沿
Data sent from the device to the host is read on the falling edge of the clock signal ; data sent from the host to the device is read on the rising edge
从设备发送给主机的数据时在时钟信号的下降沿读取的;从主机发给设备的数据是在上升沿读取的。
If the host pulls clock low before the first high - to - low clock transition , or after the falling edge of the last clock pulse , the keyboard / mouse does not need to retransmit any data
如果在第一个高- >低时钟跳变时，（或者在最后一个时钟脉冲的下降沿之后）主机将时钟拉低，键盘/鼠标不必重新传输任何数据。