Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Serial InterfacesBit 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 configures the controlling softwareTwo main tech : USB and FirewireUSB : 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 busvdd,gndD+, D-Bus topologyTiered star structure, up to tier 6USB 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 dataUSB hostClientDescribes all the software entities that are responsible for USB devicesUSB System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 layerUSB data flowBus ProtocolHost controller initiates data transfer by generating ‘token packet’Data transferredHandshake packet for completionhandshakedata transfertoken•Type of transaction•Direction of trans.•USBdevice addressAttach and Remove of USB DevicesHostHubportportportupstream portdevice•Enable port•allocate USB addressindicatordisableRemove indicatorData flow typesControl transfers configure device at attach timeBulk data transfers generate or consume large data. error detection and retries used ex) file XferInterrupt data transfers Small, limited latency transfer ex) event notification, echo from deviceIsochronous data transfers Continuous and irregular data. ex) voiceFirewire400 Mbps ( 3200Mbps for 1394b )Plug & playSupport 63 devicesProvides powerComparison to USBUSB is host-based(must be connected to computer), Firewire is peer to peer (two devices can be connected