Abstract: An access request arbitration section, a data amount management section and a resource control section are provided between a plurality of masters and a shared resource. The data amount management section manages access data amounts passing between the plurality of masters and the resource. The access request arbitration section executes arbitrary arbitration of issuing access permission to a master determined according to the access data amount at any timing, in addition to periodic arbitration of issuing access permission to any of the masters at fixed-interval arbitration timing. If an access request of less than a defined data amount is granted in periodic arbitration, the remaining access chance can be used in arbitrary arbitration.

Abstract: A receiver for receiving a signal transmitted through a transmission channel includes an equalizer and a first quality calculator that obtains a first quality value of the received signal. The equalizer includes a first channel estimation unit that estimates a first channel response of the transmission channel from the received signal using a first estimation scheme, and a second channel estimation unit that estimates a second channel response of the transmission channel from the received signal using the second estimation scheme. The equalizer equalizes the received signal using the first or second channel response and outputs the equalized signal. A portion of the second channel estimation unit halts depending on the first quality value.