Device including digital interface with mixture of synchronous and asynchronous communication, digital processing system including the same, and digital processing method performed by the same

A digital processing system comprising:

• a master chip including a first clock pin and a first data pin;
• and
• a first slave chip including a second clock pin and a second data pin,
• wherein the digital processing system is configured to perform a first transmission operation, in which first data is transmitted from the master chip to the first slave chip, based on a first synchronous scheme, in which a first clock signal output from the master chip via the first clock pin and the first data output from the master chip via the first data pin are provided together and the first data is transmitted in synchronization with the first clock signal, and
• wherein the digital processing system is further configured to perform a first reception operation, in which second data is transmitted from the first slave chip to the master chip, based on an asynchronous scheme, in which the second data output from the first slave chip via the second data pin is transmitted regardless of the first clock signal.