ECE 391 Lecture 9: Programmable Interrupt Control

• School: University of Illinois
• Department: Electrical and Computer Engineering
• Course: ECE 391
• Professor: Kalbarczyk Zbigniew

Document Summary

Programmable interrupt controller (pic) motivation & design hardware for x86. Review for exam tuesday 21 in class from master perspective, it knows which slave raised an interrupt but doesn"t know which slave"s interrupt brought it up. It uses the cascade to tell which slave to write its vector bit. From slaves perspective, it knows whether or not it has an interrupt but doesn"t know if it has priority that"s why it needs cascade to tell it has priority. Philosophers like to read newspaper each philosopher reads frequently, taking short breaks between multiple philosophers may read at same time different sections or just over another"s shoulder. General questions for synchronization of shared resouces what are the operations? what are their frequencies? exampl: walk list and find min. age? update min. age every time list changes? what are the shared data. Ece 391 - lect page 1 what are the shared data.