东南大学计算结构POC报告
20页1、Computer Ogaztin nd AchiectreCOURSE DESGM STDT NURCOURSECompr ganizan adArctecture Course DesinOJECTA Paalle uput Contolr Basing Oneriog HLSOFWAE LATFORM I 14.AEMR.171.Puoe(1)Toeign d simut a paalll oupt cntroler (POC) wich ats n interacebeteen system bs ndprinter.(2)heuseofISEsoftwarefor signnd simulation.2. sk(1) is one ftemos comn I/O modues,namely the aallelutut cotrolle. It playshe rolof anterface between h cmputer system buad the pripheral (such as a pntr or her otpu deices)Fgu 1 Piner Con
2、nciFgure h the connein o aprnter tt sysemus thogh he PO. (2) comication bete POC n he printeris conrolled by “hadshake” prtocol ilustted in igure . Figure 2 Thandshketiming iagram between POC and the prnterTh handhkig proes describeas follows:he he rite iray to eceive a charace, it olds RDY=1.T POCmstth hl a chatrat PD(arleldata) pot ad proce pus t th termin R(trasferrest) Th pritwill cane RDYt , ae th character PD n hol theRat 0 until thecarcter has ben printe(eg. 5 1ms), tn et RDY=1 an n it is
3、 rady receive he ne character.(upothe piter hs ny a one hacter “e”regir, s that eah charactrmut e ptdbfe he nxt haacterissnt).(3) The buffr registe Risusdt hold a charactr that has been se via e sstm us whleththe chrctr isbg tanferred o the prier.The stusregiser SR isedfort cotroluntion: SR7serve a a rady lag for ytembus trnferto BR(ike he rite DYsnal or tanfes rom PO to the printr), ad R isud to enleor sble ierrpt requestfrm POC If R=1,then POC ll itrrupt hen i is read to receve a charactr (i.e
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