| 摘要 |
The present invention relates to a device connection state recognizing method capable of recognizing a connection state of devices without addition of signal lines dedicated to detection. Thus, in the method according to this invention, a portion of or all of a plurality of data signal lines are connected through pull-up resistors to a high electric potential or connected through pull-down resistors to a low electric potential in accordance with the connection state of the devices, and a processing unit reads, as structure information data, a high electric potential state/low electric potential state generated by the pull-up resistor/pull-down resistor in the portion of or all the plurality of data signal lines to recognize the connection state of the devices on the basis of the read structure information data. This invention is applicable to a various types of processing units which are to be connected through a common data bus to a plurality of devices.
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