Arbitration device for arbitrating among a plurality of master devices, arbitration method, and video processing device including the arbitration device

An arbitrating method of arbitrating among a plurality of master devices, such that each master device is allowed to access a shared memory at a predetermined bandwidth, the arbitrating method comprising:

• receiving an access request requesting to access the shared memory, the access request being received from a specific master device;
• permitting an access request in a predetermined first period, if the received access request is beyond a bandwidth that has been allocated in advance;
• and
• masking an access request from the specific master device in a second period that follows the predetermined first period.

A video processing device comprising a plurality of master devices and an arbitration device that arbitrates among the master devices such that each master device is allowed to access a shared memory at a predetermined bandwidth, wherein

• the arbitration device permits an access request in a predetermined first period, if the access request has been made by a specific master device beyond a bandwidth that has been allocated in advance,
• the arbitration device masks an access request from the specific master device in a second period that follows the predetermined first period,
• the specific master device is a supply unit that supplies data to a CPU in the video processing device,
• a master device other than the specific master device is a supply unit that supplies data to a decoder unit in the video processing device, and
• the predetermined first period and the second period are prescribed to be within one processing cycle of an AV signal.