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The Priority Control register is for setting the priority of each port of the funnel. It is a requirement of the programming software that the ports are all disabled before the priority control register contents are changed. Changing the port priorities in real time is not supported. If the priority control register is written when one or more of the ports are enabled, then the write is silently rejected and the value in the priority control register remains unchanged. The lower the priority value, the higher is its priority when selecting the next port to be serviced. If two or more ports have the same priority value, then the lowest numbered port is serviced first.
The PRIORITYCONTROL register characteristics are:
The following figure shows the bit assignments.
The following table shows the bit assignments.
Table 9-233 PRIORITYCONTROL register bit assignments
Software should write the field as all 0s.
Priority value for port 7
Priority value for port 6
Priority value for port 5
Priority value for port 4
Priority value for port 3
Priority value for port 2
Priority value for port 1
Priority value for port 0