| 摘要 |
A riser card identification system identifies a riser card electrically connected with a computer system having a BIOS and a storage unit. The system includes a setting unit, a signal generating unit for generating a waveform signal according to a control signal output by the computer system, a charging/discharging unit built inside the riser card for performing a charging/discharging process to convert the waveform signal into an analog signal, a signal comparing unit for comparing the analog signal with a reference signal output by the computer system and generating a digital signal, and a signal reading unit for reading duty cycle of the digital signal. The charging/discharging unit has a characteristic value as an identification mark of the riser card corresponding to the charging/discharging unit. Therefore, the BIOS is able to identify the riser card according to the read duty cycle and information stored in the storage unit.
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