ITEC 1000 Lecture Notes - Process Control Block, Interrupt Handler, Serial Communication

• School: York University
• Department: Information Technology
• Course: ITEC 1000
• Professor: All

Document Summary

Itec 1000 winter 2010 peter khaiter. Speed issues: cpu operates at speeds much faster than the fastest i/o device, devices operate at different speeds, bursts of data, block data transfer required for some devices. Coordination: i/o devices completely operate under cpu program control, several devices perform i/o simultaneously, unexpected input (ctrl-c, ctrl-s, ctrl-alt-del, various input formats, status information needed for each device. Different formats: parallel interface, serial interface. Recognizes messages from device(s) addressed to it and accepts commands. Provides a buffer where the data from memory can be held until it can be. Provides the necessary registers and controls to perform a direct memory from the cpu transferred to the disk transfer. Copies data from its buffer to the device/from the cpu to its buffer. I/o module connected to a pair of i/o registers in cpu via bus. Input: i/o device i/o module i/o register ar under program control. Output: ar i/o register i/o module i/o device.