chap03_embedded_hardware_building_blocks_board .pdf

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1、CHAPTER3EmbeddedHardwareBuildingBlocksandtheEmbeddedBoardInThisChapterÑIntroducingtheimportanceofbeingabletoreadaschematicdiagramÑDiscussingthemajorcomponentsofanembeddedboardÑIntroducingthefactorsthatallowanembeddeddevicetoworkÑDiscussingthefundamentalelements

2、ofelectroniccomponents3.1LessonOneonHardware:LearntoReadaSchematic!Thissectionisespeciallyimportantforembeddedsoftwareengineersandprogrammers.Beforedivingintothedetails,notethatitisimportantforallembeddeddesignerstobeabletounderstandthediagramsandsymbolsthathardwa

3、reengineerscreateandusetodescribetheirhardwaredesignstotheoutsideworld.Thesediagramsandsymbolsarethekeystoquicklyandefficientlyunderstandingeventhemostcomplexhardwaredesign,regardlessofhowmuchorlittlepracticalexperienceonehasindesigningrealhardware.Theyalsocontaint

4、heinformationanembeddedprogrammerneedstodesignanysoftwarethatrequirescompat-ibilitywiththehardware,andtheyprovideinsighttoaprogrammerastohowtosuccessfullycommunicatethehardwarerequirementsofthesoftwaretoahardwareengineer.Thereareseveraldifferenttypesofengineeringh

5、ardwaredrawings,including:îBlockdiagrams,whichtypicallydepictthemajorcomponentsofaboard(processors,buses,I/O,memory)orasinglecomponent(aprocessor,forexample)atasystemsarchitectureorhigherlevel.Inshort,ablockdiagramisabasicoverviewofthehard-ware,withimplementation

6、detailsabstractedout.Whileablockdiagramcanreflecttheactualphysicallayoutofaboardcontainingthesemajorcomponents,itmainlydepictshowdifferentcomponentsorunitswithinacomponentfunctiontogetheratasystemsarchitecturelevel.Blockdiagramsareusedextensivelythroughoutthisbook(

7、infact,Figures3-5athrough3-5elaterinthischapterareexamplesofblockdiagrams),becausetheyarethesimplestmethodinwhichtodepictanddescribethecomponentswithinasystem.Thesymbolsusedwithinablockdiagramaresimple,suchassquaresorrectanglesforchips,andstraightlinesforbuses.Blo

8、ckdiagramsaretypicallynotdetailedenoughforasoftwaredesignertobeabletowriteallofthelow-levelsoftwareaccuratelyenoughtocontrolthehardware(withoutalotof77C