17.5.5.1.4 Dual Read Address Queue

In this circuit, the function is enabled for port 2, not for ports 0, 1, 3, 4.

When enabled, there are two separate read address queues in the XPI block—red queue and blue queue.

Both read queues request independently to the PA.

Red queue can be used for one traffic class only and associated to Region 2 in the QoS mapper (HPR or VPR).

Blue queue can be used for two traffic classes and associated to Region 0 and Region 1 in the QoS mapper (VPR and/or LPR).

There are separate time-outs for the blue and red queues. Timers are started to down count when the transaction is accepted in the XPI, which are then forwarded to DDRC together with the command.