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CS 2200 Week 1 Notes

by: David Meyer

CS 2200 Week 1 Notes CS 2200 A3

David Meyer

GPA 3.8
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About this Document

These notes cover syllabus day and the lectures afterward for the first week. It covers topics of ISA's and other processor type topics.
Systems and Networks
Tom Conte
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This 3 page Class Notes was uploaded by David Meyer on Sunday August 28, 2016. The Class Notes belongs to CS 2200 A3 at Georgia Institute of Technology - Main Campus taught by Tom Conte in Fall 2016. Since its upload, it has received 17 views.


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Date Created: 08/28/16
● What’s inside the box?  ○  ○ Processors (“cores”)  ○ Peripherals  ○ I/O glue  ● Layers of Abstraction  ○ Software  ■ Problem ­> Algorithm ­> Program  ○ Hardware  ■ ISA ­> Microarchitecture ­> Circuits ­> Devices  ● OS is _____?  ○ Manages computer resources  ○ Protection  ○ Memory management  ○ Interface to I/O  ○ Multics  ■ Unix, B, C ­> designed for OS  ● Course Concepts  ○ Processor  ○ Data path/ control  ○ Interrupts  ○ Pipelining  ○ Process scheduling  ○ Memory management  ○ Caches  ○ Parallel systems (parallelism)  ○ I/O disks (mass storage)  ○ Networking  ○ Disk scheduling  ○ File systems  ●  ● ISA’s: instruction set architecture (language)  ● Software ­> ISA  ○ Assembly language thorugh an assembly becomes machine language  ● Common ISAs: LC­3, x86, ARM, MIPS, LC­2200, SPARC, PowerPC, Itanium, ARB, Z80,  PDP­11, 8051 (most commonly used; it is an 8­bit)  ● ISA:   ○ state of the running program  ○ Instruction semantics and how they update state  ○ Instruction encoding syntax  ● 1st Standard ISA: IBM­360 ­> Gene Amdahl  ○ Over time more complicated, crufty, brittle  ● Care about fast  ● Care about Cost  ○ Memory: instruction length and variable instructions  ○ Energy: instruction semantics  ○ Power: cooling cost  ● Ease of Use:  ○ Used to be humans but today mostly will it compile (compilers do it)  ○ Compilers are not perfect and cannot to is with a high level language  ● Hungy ALU: arithmetic logic unit  ○ Does all the work; operands are in memory  ● Registers are used because reading and writing from main memory everytime is slow  ○ LC­3 has 8 registers  ○ LC­2200 has 16 registers  ○ X86 has 6 registers  ● CHAPTER 2  ○ Using Registers  ■ LD RE, B  ■ LD R3, C  ■ ADD R1, R2, R3  ■ ST A, R1 (“ST R1, A”)  ● X = B*B + 2*A*B + A*A  ○ Use more than once, putting in a register saves time rather than taking B out of  memory two or three times  ● Encoding  ○ Addresses are today 64 bits  ○ ADD A,B,C ­> 192 bits long!  ● Why NOT infinite registers  ○ Real estate on chip  ○ Longer the bit lines, the slower it is  ○ Time ~ Capacitor  ○ Speed Problem 


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