| 摘要 |
This processor system is provided with: a storage unit (10); a control information area (12) for storing an access prohibit flag (13) which can be set to the prohibit side by switching from the permit side; a main PEa for issuing an access request and a copy register (32) rewrite request to the storage unit (10); a security PE for determining whether or not the copy register (32) rewrite request is authorized; the copy register (32) for storing a value corresponding to the permission if the access prohibit flag (13) is set to the permit side, or for storing a value corresponding to the determination result made by the security PE if the access prohibit flag (13) is set to the prohibit side; and an access control circuit (21) for either permitting or prohibiting access from the main PEa to the storage unit (10) on the basis of an output value from the copy register (32). |
