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Ixiasoft
Visible to Intel only — GUID: pdq1483069394073
Ixiasoft
8.3.4.6.1. Example: One Master Always Takes Precedence
Consider a system that includes three masters, A, B, and C. In this system, we require that master A always takes precedence over master B at each arbitration node, and master B always takes precedence over master C. To implement this arbitration scheme, we configure all QoS generators in fixed mode, and assign appropriate values for read and write urgency, as shown in the following table:
Master | QoS Mode | P1 (Read Urgency) | P0 (Write Urgency) |
---|---|---|---|
A | Fixed (mode 0) | 0x3 | 0x3 |
B | Fixed (mode 0) | 0x2 | 0x2 |
C | Fixed (mode 0) | 0x1 | 0x1 |
In fixed mode, masters by default have a read urgency of 1 and write urgency of 0. So master C has equal urgency for reads and higher urgency for writes compared to all the other masters in the system.