19.10.2.1 Fixed Priority Arbitration

Fixed priority arbitration algorithm is the first and only arbitration algorithm applied between hosts 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 allows the MATRIX arbiters to dispatch the requests from different hosts to the same client by using the fixed priority defined by the user in the MxPR field for each host in the registers MATRIX_PRAS and MATRIX_PRBS. If two or more host requests are active at the same time, the host with the highest priority MxPR number is serviced first.

In intermediate priority pools, if two or more host requests with the same priority are active at the same time, the host with the highest number is serviced first.