Semiconductor system capable of storing different setting information in plurality of semiconductor chips sharing command/address information

A semiconductor system comprising:

• an external channel including a command/address (CA) channel, and first and second data channels;
• and
• first and second semiconductor chips which are coupled in common to the CA channel, coupled to respective different ones of the first and second data channels, and include respective coupling information pads in which different values from each other are inputted,
• wherein each of the first and second semiconductor chips includes a plurality of mode register sets, and selectively stores, in one of the mode register sets, setting information based on CA information applied to the CA channel and the value inputted to the corresponding coupling information pad,
• wherein the first semiconductor chip comprises:
• a plurality of CA pads coupled to the CA channel;
• and
• a plurality of first CA buffers, each configured to buffer, using a first CA reference voltage, a signal inputted to a corresponding one of the plurality of first CA pads, and
• wherein the second semiconductor chip comprises:
• a plurality of second CA pads coupled to the CA channel;
• and
• a plurality of second CA buffers, each configured to buffer, using a second CA reference voltage, a signal inputted to a corresponding one of the plurality of second CA pads.