当键盘或者鼠标想发送数据时，它首先必须检查时钟线，确认它处于高电平。
When the keyboard or mouse wants to send information, it first checks the Clock line to make sure it's at a high logic level.
辅助设备(指键盘)检查时钟线，如果时低电平，禁止发送数据。
The auxiliary device checks the 'clock' line. If the line is inactive, output from the device is not allowed.
如果不是，主机禁止通信，设备必须缓冲任何要发送的数据，直到主机释放时钟。
If it's not, the host is inhibiting communication and the device must buffer any to-be-sent data until the host releases Clock.
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