Patent ID: 7904666
Filing Date: 2011-03-08
Classification: G06F

Abstract:
1. An access control device that controls access of a plurality of masters to a shared memory, the access control device comprising: a first access control unit operable to, in response to an access request to the shared memory from a first master of the plurality of masters, (i) cause the first master to access the shared memory for each predetermined period using a predetermined resource allocated to the first master in advance, and (ii), when an available resource other than the predetermined resource allocated to the first master in advance exists, cause the first master to access the shared memory using the available resource and the predetermined resource allocated to the first master in advance; and a second access control unit operable to, in response to an access request to the shared memory from a second master of the plurality of masters, cause the second master to access the shared memory using the predetermined resource allocated to the first master in advance having an upper limit of use by the second master set as an amount of the available resource used by the first master, during a predetermined period subsequent to a predetermined period in which the first access control unit has caused the first master to use the available resource.