The invention discloses a fault diagnosis circuit and an integrated circuit. The fault diagnosis circuit comprises a multiplexer and a controller. The multiplexer is used for receiving a plurality of address signals, and responds to a selection signal to selectively output one of the address signals to an addressable module which is provided with a group of addressable units. The controller is used for generating a first address signal in the address signals and the selection signal, and responds to the first address signal to read the output of the addressable module.