Integrated circuit device with crossbar to route traffic

1. A device comprising:

a subsystem included in a microcontroller;

a crossbar unit configured to communicate with the subsystem, and further configured to communicate with an external memory device via a plurality of channels, wherein the crossbar unit is coupled to a set of masters, wherein the crossbar unit is configured to monitor bandwidth usage at the plurality of channels and route traffic between the set of masters and the plurality of channels based on the monitored bandwidth usage, and

the crossbar unit comprising a crossbar routing element configured to route traffic based on an operating mode of the crossbar unit.

2. The device of claim 1 , wherein the plurality of channels is included in a communication link.

3. The device of claim 1 , wherein the crossbar unit is configured to selectively route the traffic in a manner that balances the traffic across the plurality of channels.

4. The device of claim 1 , wherein the crossbar routing element is further configured to selectively route requests between a plurality of master ports of the crossbar unit and a plurality of slave ports of the crossbar unit based on an operating mode of the crossbar unit.

5. The device of claim 4 , wherein the operating mode is one of a plurality of selectable operating modes, and wherein the crossbar routing element is further configured to selectively route requests based on a currently selected operating mode.

6. The device of claim 5 , wherein the plurality of selectable operating modes includes a load dynamic mode which uses a dynamic mapping between the slave ports and the master ports based on an outstanding transaction count for each of the plurality of channels.

7. The device of claim 1 , wherein the set of masters comprises a set of higher priority masters and a set of lower priority masters.

8. The device of claim 1 , wherein the crossbar unit comprises:

at least one counter, and wherein the monitoring the bandwidth usage at the plurality of channels by the crossbar unit comprises incrementing the at least one counter based on read requests sent to the external memory device.

9. The device of claim 1 , wherein the subsystem is part of a video processing subsystem.

10. A system comprising:

at least one memory device; and

a microcontroller coupled to the at least one memory device via a plurality of channels, the microcontroller comprising:

a plurality of masters coupled to the plurality of channels;

a crossbar unit configured to communicate with the at least one memory device via the plurality of channels, wherein the crossbar unit is coupled to the plurality of masters, and wherein the crossbar unit is configured to monitor bandwidth usage at the plurality of channels and route traffic between the plurality of masters and the plurality of channels based on the monitored bandwidth usage; and

a crossbar routing element configured to route traffic based on an operating mode of the crossbar unit.

11. The system of claim 10 , wherein the plurality of channels is included in a communication link.

12. The system of claim 10 , wherein the crossbar unit is configured to selectively route the traffic in a manner that balances the traffic across the plurality of channels.

13. The system of claim 10 , wherein the crossbar routing element is further configured to selectively route requests between a plurality of master ports of the crossbar unit and a plurality of slave ports of the crossbar unit based on an operating mode of the crossbar unit.

14. The system of claim 13 , wherein the operating mode is one of a plurality of selectable operating modes, and wherein the crossbar routing element is further configured to selectively route requests based on a currently selected operating mode.

15. The system of claim 14 , wherein the plurality of selectable operating modes includes a load dynamic mode which uses a dynamic mapping between the slave ports and the master ports based on an outstanding transaction count for each of the plurality of channels.

16. A method comprising:

sending read requests from a plurality of masters to an external memory device via a plurality of channels coupling the external memory device to a crossbar unit;

monitoring, using the crossbar unit, usage of the plurality of channels; and

selectively routing, using a crossbar routing element, read requests from at least some of the plurality of masters to the plurality of channels based on the monitored usage of the plurality of channels, the routing being performed based, at least in part, on an operating mode of the crossbar unit.

17. The method of claim 16 , wherein the plurality of channels are included in a communication link.

18. The method of claim 16 , wherein the routing further comprises:

selectively routing, using the crossbar unit, traffic in a manner that balances the traffic across the plurality of channels.

19. The method of claim 16 , wherein the routing further comprises:

selectively routing, using the crossbar routing element, transactions between a plurality of master ports and a plurality of slave ports based on an operating mode of the crossbar unit.

20. The method of claim 19 , wherein the operating mode is one of a plurality of selectable operating modes, and wherein the plurality of selectable operating modes includes a load dynamic mode which uses a dynamic mapping between the slave ports and the master ports based on an outstanding transaction count for each of the plurality of channels.