Interface method for transmitting and receiving data between functional blocks in system on chip, and system on chip using same

An interface method in a system-on-chip, comprising:

• setting, by a first circuit unit, a resource value to an initial value corresponding to a number of payload data storable in a buffer of a second circuit unit;
• transmitting, by the first circuit unit, first payload data transferred from a first functional block and a first signal for requesting buffer allocation for storing the first payload data to the second circuit unit, and decreasing the resource value by one;
• storing, by the second circuit unit, the first payload data in the buffer according to the first signal;
• withdrawing, by the second circuit unit, payload data selected among the payload data stored in the buffer and transferring the payload data to a second functional block, and transmitting a second signal indicating that the buffer is empty to the first circuit unit;
• and
• increasing, by the first circuit unit, the resource value by one according to the second signal,
• wherein a first clock signal used by the first circuit unit and a second clock signal used by the second circuit unit have different clock frequencies, and
• wherein the first circuit unit includes a proxy circuit unit configured to assert a third signal for the first functional block based on the resource value.

A system-on-chip comprising:

• a first circuit unit transmitting first payload data transferred from a first functional block and a first signal for requesting buffer allocation for storing the first payload data;
• and
• a second circuit unit with a buffer, the second circuit unit storing the first payload data in the buffer according to the first signal, withdrawing payload data selected among the payload data stored in the buffer to transfer the selected payload data to a second functional block, and transmitting a second signal indicating that the buffer is empty to the first circuit unit,
• wherein the first circuit unit sets a resource value to an initial value corresponding to a number of payload data capable of being stored in the buffer, decreases the resource value by one when the first circuit unit transmitting the first payload data, and increases the resource value by one according to the second signal,
• wherein a first clock signal used by the first circuit unit and a second clock signal used by the second circuit unit have different clock frequencies, and
• wherein the first circuit unit includes a proxy circuit unit configured to assert a third signal for the first functional block based on the resource value.