CPSC 355 Lecture Notes - Lecture 3: Hard Disk Drive, Control Bus, Address Bus

• School: University of Calgary
• Department: Computer Science
• Course: CPSC 355
• Professor: Leonard Manzara

Document Summary

Is used to transfer information between computer components. Often subdivided into address, data, and control busses: Specifies a memory location in ram: or sometimes a memory-mapped i/o device. Used to control or monitor devices connected to the bus: eg: read/write signal for ram. A(cid:374) e(cid:454)pa(cid:374)sio(cid:374) (cid:271)us (cid:373)a(cid:455) (cid:271)e (cid:272)o(cid:374)(cid:374)e(cid:272)ted to the (cid:272)o(cid:373)puter"s lo(cid:272)al (cid:271)us. Makes it easy to connect additional i/o devices to the computer. Is used to hold a (cid:272)o(cid:373)puter"s file system. Usually embodied on a hard disk drive (hdd) But solid state drives (ssds) are becoming more common. Allow communication between the computer and the external environment. Operands for an instruction comes from the accumulator register (acc) and from a single location in ram. Alu results are always put into the acc. The acc can be loaded from or stored to ram. Only load and store instructions can access ram.