Abstract: Before arbitration is performed in an arbitration section, an access from a master is kept in a waiting state until update of a conversion table buffer is performed, and an address conversion section is provided in a subsequent stage of the arbitration section. Without waiting for the completion of buffer update, an access is issued in advance at a time when it is assured that update is completed at the completion of address conversion. Thus, influences of waiting buffer update on another master can be eliminated and access latency can be reduced.

Abstract: A transfer canceler is provided on a bus connecting a master and a slave together. The transfer canceler interrupts the bus so that an invalid command flowing through the bus does not reach the slave when the master is in the reset state, and at the same time, generates and receives data to and from the slave corresponding to an access request command which has been output to the slave on behalf of the master disabled by resetting. In addition, in order to more quickly complete a process which has been issued to the slave, a circuit is additionally provided which temporarily changes an arbitration priority level or an operating frequency of the slave.

Abstract: A transmission cancellation section is provided on a bus connecting a master and a slave. During a reset of the master, the transmission cancellation section blocks the bus so that an invalid command flowing on the bus does not reach the slave and executes, instead of the master stopped by the reset operation, generation of data which corresponds to an access request command already output to the slave and is to be sent to the slave and receiving of data from the slave.

Abstract: Before arbitration is performed in an arbitration section, an access from a master is kept in a waiting state until update of a conversion table buffer is performed, and an address conversion section is provided in a subsequent stage of the arbitration section. Without waiting for the completion of buffer update, an access is issued in advance at a time when it is assured that update is completed at the completion of address conversion. Thus, influences of waiting buffer update on another master can be eliminated and access latency can be reduced.

Abstract: A transmission cancellation section is provided on a bus connecting a master and a slave. During a reset of the master, the transmission cancellation section blocks the bus so that an invalid command flowing on the bus does not reach the slave and executes, instead of the master stopped by the reset operation, generation of data which corresponds to an access request command already output to the slave and is to be sent to the slave and receiving of data from the slave.

Abstract: A rendering device according to the present invention comprises an information acquiring unit for acquiring system information or rendering object information, a control point generating section for setting a curved surface interpolating level serving to determine number of control points for creating a curved surface or a curved line based on the acquired information and thereby generating the control point in accordance with the curved surface interpolating level, and a curved surface creating section for creating the curved surface based on the control point, wherein an operation quantity for rendering the curved surface of a display object is dynamically changed based on the acquired information.

Abstract: A bus arbitration part for arbitrating access requests from bus masters includes an arbitration history management section that records absence of an access request from any bus master at a given basic arbitration timing. Based on this record, an access request arbitration section issues access permission for an access request issued after the given basic arbitration timing without a wait for the next basic arbitration timing.

Abstract: A rendering device according to the present invention comprises an information acquiring unit for acquiring system information or rendering object information, a control point generating section for setting a curved surface interpolating level serving to determine number of control points for creating a curved surface or a curved line based on the acquired information and thereby generating the control point in accordance with the curved surface interpolating level, and a curved surface creating section for creating the curved surface based on the control point, wherein an operation quantity for rendering the curved surface of a display object is dynamically changed based on the acquired information.