Hard disk backboard and detection method of serial general input/output signal of hard disk backboard

The invention provides a hard disk backboard and a detection method of a serial general input/output signal of the hard disk backboard. The detection method of a serial general input/output signal comprises the following steps: obtaining a serial general input/output signal, wherein the serial general input/output signal comprises a loading signal and a clock rate signal; on the basis of the loading signal and the clock rate signal, accumulating a first count value of which the initial value is zero; and when the first count value is greater than a first preset value, capturing the first count value at a first time point according to the voltage level state of the loading state, and judging the one-frame volume of the serial general input/output signal according to the captured first count value. 本发明提供一种硬盘背板及其串行通用输入输出信号的检测方法，所述串行通用输入输出信号的检测方法包括取得一串行通用输入输出信号，其中串行通用输入输出信号包括一载入信号及一时脉信号，以及依据载入信号及时脉信号，对初始值为零的一第一计数值进行累加，以及当第一计数值大于一第一预设值时，依据载入信号的电压电平状态，于一时点撷取第一计数值，并依据被截取的第一计数值来判断串行通用输入输出信号的一帧容量。