Control chip, operating circuit, and interface simulation method

An operating circuit comprising:

• a control chip comprising:
• a communication interface configured to receive an access package;
• a first serial interface comprising:
• a first pin operating in an alternate function mode;
• and
• a second pin operating in the alternate function mode;
• a first control logic coupled to the first serial interface;
• and
• a slave device comprising:
• a management data input-output interface comprising a bidirectional data pin coupled to the first and second pins,
• wherein:
• in response to the access package having a read operation code, the first control logic uses the first pin to output the read operation code and read information to the bidirectional data pin and sets the first pin to operate in a GPIO mode,
• the slave device provides read data according to the read information,
• the first control logic uses the second pin to receive the read data.

An interface simulation method to simulate a serial interface to a management data input-output interface, wherein the serial interface comprises a first pin and a second pin which operate in an alternate function mode, comprising:

• receiving an access package;
• determining whether the access package has a write operation code;
• using the first pin to output write information to a slave device in response to the access package having the write operation code;
• in response to the access package not having the write operation code:
• using the first pin to output read information to the slave device;
• setting the first pin to operate in a GPIO mode;
• and
• using the second pin to receive read data from the slave device.