ARBITRATION CIRCUIT AND PROCESSING METHOD OF ARBITRATION CIRCUIT

摘要

In an arbitration circuit, transactions output from a plurality of master circuits are stored in a first-in-first-out type first buffer, and when a high-priority transaction higher in priority than one of the stored transactions is output from one of the plural master circuits, a cancel request of a low-priority transaction lower in priority than the high-priority transaction, out of the stored transactions, is output to a second buffer in a slave circuit, and when the cancel request is successful, the high-priority transaction is output to the slave circuit, and after the high-priority transaction is output to the slave circuit, the low-priority transaction whose cancel request is successful is output to the slave circuit.

主权项

1. An arbitration circuit comprising:
an interface circuit which stores transactions output from a plurality of master circuits in a first-in-first-out type first buffer and outputs the stored transactions stored in the first buffer to a slave circuit; and a control circuit which controls the interface circuit based on results of monitoring the transactions output from the plural master circuits, wherein, when a high-priority transaction higher in priority than one of the stored transactions is output from one of the plural master circuits, the interface circuit outputs, according to the control by the control circuit, a cancel request of a low-priority transaction whose priority is lower than the priority of the high-priority transaction, out of the stored transactions, to a first-in-first-out type second buffer which is in the slave circuit and in which the same transactions as the stored transactions are stored, and when the cancel request is successful, outputs the high-priority transaction to the slave circuit, and after outputting the high-priority transaction to the slave circuit, outputs, to the slave circuit, the low-priority transaction whose cancel request is successful.