AXI Switch Arbitration

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The AXI Switch arbitration is configured as listed in the following tables.

Table 1. Arbitration of Slave Ports
Slave port	Slave	Arbitration type Write and Read Address	Arbitration type Write Data	Description
0	Default Slave	First come first served	First come first served	This is the default slave that responds to illegal addresses
1-8	Others	QoS Arbiter	Fair Among equals	—
9	Trace Slave	Priority	Priority	—

Table 2. Arbitration of Master Ports
Master port	Master	Arbitration type Write and Read Address	Arbitration type Write Data	Description
1-8	Others	Fair among equals	Fair among equals	—
9	SCB/System Controller Master	Priority	Priority	System Controller comes with the highest priority
10-14	Others	Fair among equals	Fair among equals	—
15	Trace Master	Priority	Priority	Trace comes with the highest priority

The following rules are applicable:

Priority: Highest priority and the lowest number client with the same priority wins.
First Come First Serve: Clients are granted in the order they request, longer waiting client has the highest priority.
Fair Among Equals: Two-tier arbitration. First tier is dynamic priority, second tier shares equally between clients of the same highest requesting priority on a cycle-by- cycle basis.