1/O Hardware overview o Common concepts:CPU→PoRT→BUS→Controller -Port(端▣)：the connection point via which a device communicates with the machine. ,Bus(总线)：daisy chain(菊花链)or shared direct access *PCI(Peripheral Component Interconnect(外部器件互连)) SCSI(Small computer systems interface) ★Expansion bus ~Controller(控制器) Simple:serial port Complex:bus controller (host adapter),device controller 口⊙注，1,2月00 陈适兰xlanchen@ustc.edu.cn http:/staf.u01174O1:Operating System操作系统原理斐 May22,20196/54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I/O Hardware overview Common concepts : CPU→PORT→BUS→Controller ▶ Port (端口): the connection point via which a device communicates with the machine. ▶ Bus (总线): daisy chain(菊花链) or shared direct access ⋆ PCI (Peripheral Component Interconnect(外部器件互连) ) ⋆ SCSI (Small computer systems interface) ⋆ Expansion bus ▶ Controller (控制器) ⋆ Simple: serial port ⋆ Complex: bus controller (host adapter), device controller 陈香兰 xlanchen@ustc.edu.cn http://staff.ustc.edu.cn/~xlanchen (Computer Application Laboratory, CS, USTC @ Hefei Embedded System Laboratory, CS, USTC @ Suzhou) 0117401: Operating System 操作系统原理与设计 May 22, 2019 6 / 54