摘要:
A data processing device with an efficient mechanism for controlling bus priority of multiple processors. The device has a data memory that is accessible to the processors via each processor's individual control bus and a common control bus. A bus selector is disposed between the individual control buses and the common control bus and controlled by a bus arbiter that resolves bus requests on the individual control buses from the processors attempting access to the data memory. The bus arbiter sends a selection command to the bus selector, thereby permitting a specified processor to reach the data memory. A bus monitor counts bus requests and conflicts between them, determines priority of each processor attempting access to the data memory according to the count results, and sends a wait command signal to low-priority processors so as to delay their access to the data memory.
摘要:
A data processing device with an efficient mechanism for controlling bus priority of multiple processors. The device has a data memory that is accessible to the processors via each processor's individual control bus and a common control bus. A bus selector is disposed between the individual control buses and the common control bus and controlled by a bus arbiter that resolves bus requests on the individual control buses from the processors attempting access to the data memory. The bus arbiter sends a selection command to the bus selector, thereby permitting a specified processor to reach the data memory. A bus monitor counts bus requests and conflicts between them, determines priority of each processor attempting access to the data memory according to the count results, and sends a wait command signal to low-priority processors so as to delay their access to the data memory.
摘要:
An electronic telephone directory provided in a cell phone includes a telephone directory storage for storing entry data of an entry registered in the electronic telephone directory. The entry data includes an entry identifier for identifying the entry, an entry name, a telephone number, and link identifiers of link destinations. The electronic telephone directory also includes tree display means for displaying the entry name included in entry data of each entry registered in the telephone directory storage, associated with the entry names included in entry data of the link destinations in a tree form.
摘要:
A mobile telephone terminal (2) is provided with an electrical field strength measurement unit (201) that receives radio signals from wireless base stations (31) and measures the strengths thereof; a registration destination base station selection unit (206) that selects one of the wireless base stations (31) that sent the received radio signals as a position registration destination; a position registration execution unit (203) that sends a position registration request to the selected wireless base station (31); and an execution timer expiry determination unit (210) that performs a position registration update process by causing, when a predetermined amount of time has elapsed following the position registration, the registration destination base station selection unit (206) to select a wireless base station (31), and causing the position registration execution unit (203) to send a position registration request to the selected wireless base station (31).
摘要:
A mobile communication terminal includes a measuring portion measuring intensity of received radio waves that are radio waves received from base stations, a selecting portion selecting one of the base stations to which a request for location registration of the mobile communication terminal should be sent, and a requesting portion sending the request to the base station selected by the selecting portion. When the request is sent, the selecting portion initially selects a first base station of the base stations whose received radio wave has the highest intensity measured by the measuring portion, and, subsequently if the location registration in accordance with the request sent to one of the base stations has failed, the selecting portion selects a second base station of the base stations whose received radio wave has intensity lower than the intensity of the received radio wave from the one of the base stations.