Stanford EE 282 - Serial Interfaces (12 pages)

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Serial Interfaces



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Serial Interfaces

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Pages:
12
School:
Stanford University
Course:
Ee 282 - Computer Systems Architecture

Unformatted text preview:

Serial Interfaces Bit serial bus New generation of busses Uses bit serial differential drive technology Uses on line device drivers Hot plug technology Automatically detects plugged in devices and confi gures the controlling software Two main tech USB and Firewire USB Universal Serial Bus 12 Mb s serial bus Hot plug tech plug play Supports up to 127 external devices Provides power USB 2 0 480 Mb s serial bus vdd g nd D D Bus topology Tiered star structure up to tier 6 USB devices HUB Serve to USB connectivity Can detect attach and detach Hub Controller Hub repeater Functions USB device that is able to transmit or receive data USB host Client USB System Describes all the software entities that are responsible for USB devices Translation between the client data and USB transaction on the interconnect Managing USB resources bandwidth power USB Bus interface Handles interactions for the electrical protocol layer USB data flow Bus Protocol data transfer token Type of transactio n handshake Direction of trans USBdevice addre initiates data transfer by generating ss Host controller token packet Data transferred Handshake packet for completion Attach and Remove of USB Devices Enable port Remov allocate indicat upstream port e disable USB indicat or address device or Hub port port port Host Data flow types Control transfers Bulk data transfers generate or consume large data error detection and retries used ex file Xfer Interrupt data transfers configure device at attach time Small limited latency transfer ex event notification echo fr om device Isochronous data transfers Continuous and irregular data ex voice Firewire 400 Mbps 3200Mbps for 1394b Plug play Support 63 devices Provides power Comparison to USB USB is host based must be connected to c omputer Firewire is peer to peer two devi ces can be connected directly Website http www usb org http www apple com firewire



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