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IP2 USB 2.0

This course covers USB2.0

formateur
Objectives
  • The course details the hardware implementation and describes the tests required to check the compliance of an equipment.
  • All interconnect standards between Link and PHY are explained: UTMI, UTMI+, ULPI as well Inter-Chip USB.
  • An architectural view of an USB system implementing low speed, full speed and high speed devices is described.
  • The course details the various steps of the bus enumeration sequence.
  • Packet format and USB transactions are taught with the assistance of the Lecroy USB analyser.
  • The course details the requirements of the EHCI specification.
  • HID class device specification and mass-storage classes are covered on request.
A Lecroy USB analyser is used to capture and display USB traffic.
•  A lot of traces are included in the material.
A more detailed course description is available on request at training@ac6-training.com
Prerequisites
  • Experience of a digital bus is mandatory.

SYSTEM ARCHITECTURE
  • Introduction to USB
  • Management of periodic traffics
  • Software organization
  • Highlighting the differences between transfer, transaction and packet
  • Device configuration, standard descriptors and commands
ELECTRICAL SPECIFICATION
  • Cable and connectors
  • Low Speed / Full Speed signalling
  • Reset sequence
  • High Speed signalling
  • Reset sequence, chirp negotiation
TRANSFER PROTOCOL
  • Low Speed / Full Speed protocol
  • Periodic traffics in High Speed systems
  • Non periodic traffics in High Speed systems
  • Error detection
  • Power management
BUS CONFIGURATION
  • Device configuration – Standard descriptors
  • Device configuration – Standard commands
  • Initialization sequence
    • A trace is studied to understand the initialization sequence by using the ability of the trace viewer to decode standard requests
  • Purpose of USB classes, list of classes
USB ON-THE-GO 2.0
  • Typical applications
  • New plug and receptacles
  • Electrical requirements
  • Attach Detection Protocol
  • Session Request Protocol
  • Host Negociation Protocol
  • Testing the interface
BATTERY CHARGING SPECIFICATION
  • Accessory Charger Adapter
  • Charger detection hardware
  • Primary detection
  • Secondary detection
  • Charger detection algorithms
  • Electrical requirements
HUB OPERATION
  • Hub architecture
  • Split transactions
  • The Hub class - Descriptors
  • The Hub class - Commands
    • A trace is studied to understand the configuration of a hub by using the ability of the trace viewer to decode hub class requests
TRANSCEIVER STANDARD INTERFACES
  • UTMI, elastic buffer, transmit and receive transmit diagrams
  • Carkit, multiplexing USB traffic, UART and analog audio on the USB cable
  • UTMI+ 1.0, description of new signals required to support OTG
  • UTMI+ 1.0, level 2 and 3
  • ULPI 1.1, low pin count interface, transfer protocol
HOST CONTROLLER OPERATION
  • OHCI
  • UHCI
  • Introduction to EHCI
  • Host Controller initialisation
  • Port routing and control
  • Periodic schedule
  • Asynchronous schedule
  • Managing Control / Bulk / Interrupt transfer via Queue Heads
DEBUGGING A USB APPLICATION
  • Compliance checklists released by the USB Implementers Forum
  • USB2.0 electrical test specification
  • Detailing the list of tests to be run on the oscilloscope
  • Lecroy solutions: protocol analysers / exercicers, test of the physical layer
HID CLASS DEVICES [On request]
  • Operational model, item parser, report ID
  • Descriptors, HID descriptor, report descriptor: main item, global item, local item
  • Requests: GetReport/SetReport, GetIdle/SetIdle, GetProtocol/SetProtocol
  • Boot interface descriptors: mouse and keyboard
    • A trace related to a mouse is used all along this chapter to provide practical examples of HID report descriptor and mouse report transfer format
MASS STORAGE CLASS DEVICES [On request]
  • Relationship with ATAPI specification
  • Reduced Block commands
  • SCSI primary commands
  • MMC command set
  • Control, Bulk, Interrupt transport
  • Standard descriptors
  • Bulk only transport
    • USB memory stick traffic has been captured to explain the various protocols described in this chapter
USB FOR SMARTCARD [On request]
  • Basics of ISO/IEC 7816-3
  • Answer To Reset
  • Protocol and Parameter Selection
  • Interchip USB, voltage class negotiation
  • Interchip USB, device attachment / detachment, highlighting when RPU and RPD have to be connected and disconnected
  • ETSI TS 102 600 UICC-Terminal interface, Characteristics of the USB interface
  • SimCard, ICCD class, transporting ISO messages over USB
  • Managing a POS, CCID class
AUDIO CLASS [On Request]
  • Audio device types
  • Synchronization issues, difference between synchronous and isochronous
  • Synchronous, asynchronous and adaptive synchronizations
  • Feedback pipe
  • Isochronous endpoint descriptor
  • Interface descriptor
  • Audio Control
  • Unit descriptors
  • Audio specific requests
  • Retrieving the audio system architecture through the chained units and terminals