The fixed priority arbitration algorithm is the first and only arbitration algorithm applied between masters from distinct priority pools. It is also used in priority pools other than the highest and lowest priority pools (intermediate priority pools).
Fixed priority arbitration is used by the MATRIX arbiters to dispatch the requests from different masters to the same slave by using the fixed priority defined by the user. If requests from two or more masters are active at the same time, the master with the highest priority number is serviced first. If requests from two or more masters with the same priority are active at the same time, the master with the highest number is serviced first.
For each slave, the priority of each master is defined in the MxPR field in the Priority Registers, MATRIX_PRAS and MATRIX_PRBS.