is a Watchdog Timer and others.
* <https://opencores.org/project,simple_pic>
* <https://bitbucket.org/casl/c-class/src/0e77398a030bfd705930d0f1b8b9b5050d76e265/src/peripherals/plic/?at=master>
+* <https://github.com/RoaLogic/plic>
+* <https://github.com/pulp-platform/ariane/tree/master/src/plic>