Communication circuitry and control circuitry thereof

Control circuitry for use in an integrated circuit, the integrated circuit comprising N communication nodes being clock-candidate nodes, where N≥2, and N communication units for communication using respective communication protocols, and connected or connectable to receive respective clock signals for communication under their respective communication protocols via respective said clock-candidate nodes, wherein at least one said communication unit is connected or connectable to receive and/or transmit data under its respective communication protocol via at least one said clock-candidate node other than the clock-candidate node via which that communication unit is to receive its respective clock signal,

• the control circuitry being configured, in a decision operation, to monitor the clock-candidate nodes and decide which of the communication protocols is in use dependent on at which of the clock-candidate nodes a received clock signal is detected.

A method of controlling an integrated circuit, the integrated circuit comprising N communication nodes being clock-candidate nodes, where N≥2, and N communication units for communication using respective communication protocols, and connected or connectable to receive respective clock signals for communication under their respective communication protocols via respective said clock-candidate nodes, wherein at least one said communication unit is connected or connectable to receive and/or transmit data under its respective communication protocol via at least one said clock-candidate node other than the clock-candidate node via which that communication unit is to receive its respective clock signal, the method comprising, in a decision operation, monitoring the clock-candidate nodes and deciding which of the communication protocols is in use dependent on at which of the clock-candidate nodes a received clock signal is detected.