hl ce m, lehmann usb_tele esc spring.ppt 1 - 9/8/2015, 10:22 start first foil

HL CE M, lehmannusb_tele ESC spring.ppt

1 - 04/19/23, 12:48

START first foilSTART first foil


2 - 04/19/23, 12:48

USB based Microcontroller in USB based Microcontroller in Telecom Peripherals for PC'sTelecom Peripherals for PC's

...the interfacing solution...the interfacing solution


3 - 04/19/23, 12:48

AgendaAgenda USB basics USB basics

- Why USBWhy USB

- Bus structureBus structure

- Enumeration, speedEnumeration, speed

- Layer modelLayer model

- Physical interfacePhysical interface

- Transfer, transaction, packetTransfer, transaction, packet USB - ISDN Terminal Adapter (TA)USB - ISDN Terminal Adapter (TA)

- Standard TA (PC ISDN card) - USB TAStandard TA (PC ISDN card) - USB TA

- Endpoints usage, ISDN data formatEndpoints usage, ISDN data format

- Hardware implementation, BufferingHardware implementation, Buffering

- B-channel performanceB-channel performance

- Layer model USB TA Layer model USB TA PC ISDN card PC ISDN card

- D-channel signalization through USBD-channel signalization through USB

- D-channel performanceD-channel performance

- Hardware platform, toolsHardware platform, tools

- SAB-C541USAB-C541U


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Siemens / USBSiemens / USBthe interfacing solutionthe interfacing solution

Universal Serial Bus Universal Serial Bus


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Why USB ?Why USB ?


Ease of UseEase of Use- Plug and Play capabilities for “Outside the Box” peripheralsPlug and Play capabilities for “Outside the Box” peripherals

Youwanna more?!


6 - 04/19/23, 12:48

USBUSBUSBUSB


USB Target ApplicationsUSB Target Applications

PERFORMANCE PERFORMANCE PERFORMANCE PERFORMANCE APPLICATIONSAPPLICATIONSAPPLICATIONSAPPLICATIONS ATTRIBUTESATTRIBUTESATTRIBUTESATTRIBUTES

HIGH SPEEDHIGH SPEED50 - 1000 Mb/s50 - 1000 Mb/sHIGH SPEEDHIGH SPEED50 - 1000 Mb/s50 - 1000 Mb/s

VideoVideoDiskDiskLANLAN

VideoVideoDiskDiskLANLAN

High BandwidthHigh BandwidthVery Low LatencyVery Low LatencyEase of UseEase of Use

High BandwidthHigh BandwidthVery Low LatencyVery Low LatencyEase of UseEase of Use

Very Low costVery Low costEase of UseEase of UseDynamic Attach-DetachDynamic Attach-DetachMultiple Peripherals Multiple Peripherals

Very Low costVery Low costEase of UseEase of UseDynamic Attach-DetachDynamic Attach-DetachMultiple Peripherals Multiple Peripherals

Low costLow costGuaranteed Latency Guaranteed Latency Higher BandwidthHigher BandwidthEase of UseEase of Use

Low costLow costGuaranteed Latency Guaranteed Latency Higher BandwidthHigher BandwidthEase of UseEase of Use

LOW SPEEDLOW SPEED10 - 100 Kb/s10 - 100 Kb/s

LOW SPEEDLOW SPEED10 - 100 Kb/s10 - 100 Kb/s

Interactive DevicesInteractive Devices(Game, VR)(Game, VR)

Interactive DevicesInteractive Devices(Game, VR)(Game, VR)

MEDIUM SPEEDMEDIUM SPEED500Kb/s - 10Mb/s500Kb/s - 10Mb/s

MEDIUM SPEEDMEDIUM SPEED500Kb/s - 10Mb/s500Kb/s - 10Mb/s

ISDN, POTS, PBX, ISDN, POTS, PBX, Audio, Imaging,Audio, Imaging,Bulk DevicesBulk Devices

ISDN, POTS, PBX, ISDN, POTS, PBX, Audio, Imaging,Audio, Imaging,Bulk DevicesBulk Devices

1394+1394+""firewire"firewire"1394+1394+

""firewire"firewire"

USB focus on

USB focus on LOW C

OST

LOW COST, , H

IGH VOLUME

HIGH VOLUME applic

ations!

applicatio

ns!

USB focus on

USB focus on LOW C

OST

LOW COST, , H

IGH VOLUME

HIGH VOLUME applic

ations!

applicatio

ns!


7 - 04/19/23, 12:48

USB in 1996:USB in 1996:Initially introduced as an Initially introduced as an additional connector for additional connector for new applications.new applications.

USBUSB

PC Connectivity VisionPC Connectivity Vision


KeyboardKeyboard

MouseMouse

SerialSerialPortPort

ParallelParallelPortPort

SCSISCSIPortPort

Sound/GameSound/GamePortsPorts

GraphicsGraphicsPortPort

LANLAN ModemModem

GraphicsGraphicsPortPort

LANLAN

USB Future:USB Future:The PC evolves into a The PC evolves into a simpler, easier to use simpler, easier to use appliance.appliance.

USBUSB USBUSB USBUSB

Telephony, Modem, Keyboard, Mouse,Game ports, Telephony, Modem, Keyboard, Mouse,Game ports, Serial ports Device,Digital Audio, Printer, ScannerSerial ports Device,Digital Audio, Printer, Scanner


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Hardware Overview...Hardware Overview...


USB

TopologyTopology- Tiered Star (Distributes Connectivity Points) Tiered Star (Distributes Connectivity Points) - 127 logical connections (upto 5 meters per segment)127 logical connections (upto 5 meters per segment)- Upto 6 tiersUpto 6 tiers- ......

Monitor

SpeakerPen Mouse

Kbd

Mic Phone

PC

HUBHUB

HOST/HUB


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...Topology......Topology...


HostHost

- One PC host per systemOne PC host per system

HubHub

- Provides connecting ports, power, terminationsProvides connecting ports, power, terminations

- Self-Powered or Bus PoweredSelf-Powered or Bus Powered

Device, Function and End-pointsDevice, Function and End-points

- Device is a collection of function(s) Device is a collection of function(s)

- Function is a collection of end-pointsFunction is a collection of end-points

- Upto 127 functions and 16 end-points per functionUpto 127 functions and 16 end-points per function


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Host

Root Hub

Device

DeviceDevice

Device

HUB

Device

HUB

Hot Plug and Play featureHot Plug and Play feature

- Device attachment on Hub portDevice attachment on Hub port

- Device is detectedDevice is detected

- Downstream port is enabledDownstream port is enabled

- Configuration of Device by Configuration of Device by HostHost

Device

USB Configuration ProcessUSB Configuration ProcessEnumerationEnumeration Host Software is responsible for Host Software is responsible for

Device configurationDevice configuration Host

Root Hub

Device

DeviceDevice

Device Device

HUB

Device

HUB

Universal Serial Bus, details Universal Serial Bus, details

Process of Configuration is Process of Configuration is accomplished via Control accomplished via Control TransfersTransfers


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Hardware OverviewHardware Overview

- Bus transactionsBus transactions

- Speed:Speed: 12Mbps full-speed12Mbps full-speed1.5Mbps low-speed1.5Mbps low-speed

- Isochronous and Asynchronous Isochronous and Asynchronous

- Media access controlled by hostMedia access controlled by host

- Bus transactionsBus transactions

- Speed:Speed: 12Mbps full-speed12Mbps full-speed1.5Mbps low-speed1.5Mbps low-speed

- Isochronous and Asynchronous Isochronous and Asynchronous

- Media access controlled by hostMedia access controlled by host

- Configuration, Hot Plug-And-PlayConfiguration, Hot Plug-And-Play

- Dynamic insertion-removalDynamic insertion-removal

- Autoconfiguration on changeAutoconfiguration on change

- Configuration, Hot Plug-And-PlayConfiguration, Hot Plug-And-Play

- Dynamic insertion-removalDynamic insertion-removal

- Autoconfiguration on changeAutoconfiguration on change

- Physical LayerPhysical Layer

- 2-wire differential signaling, NRZI coded with bit stuffing2-wire differential signaling, NRZI coded with bit stuffing

- Supply Sourcing +5VSupply Sourcing +5V

- Signaling at CMOS 3.3VSignaling at CMOS 3.3V

- 4 pin connector, 4 wire cable4 pin connector, 4 wire cable

- Physical LayerPhysical Layer

- 2-wire differential signaling, NRZI coded with bit stuffing2-wire differential signaling, NRZI coded with bit stuffing

- Supply Sourcing +5VSupply Sourcing +5V

- Signaling at CMOS 3.3VSignaling at CMOS 3.3V

- 4 pin connector, 4 wire cable4 pin connector, 4 wire cable


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Device Abstractions...Device Abstractions...

- DeviceDevice

- Common features and interactions of devicesCommon features and interactions of devices

- Typically controlled by system softwareTypically controlled by system software


- FunctionFunction

- Highest level I/F between device driver and functionHighest level I/F between device driver and function

- End PointEnd Point

- Ultimate data source or sink at the device endUltimate data source or sink at the device end

- Each endpoint is unidirectional and has a Each endpoint is unidirectional and has a transfer type associated with it‘s Peripheral transfer type associated with it‘s Peripheral


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...Device Abstractions...Device Abstractions

DeviceDeviceDriverDriver FunctionFunction

USBUSBSoftwareSoftware

USB DeviceUSB DeviceI/FI/F

HostHostControllerController

USBUSBHardwareHardware

Function AbstractionFunction Abstraction

Device AbstractionDevice Abstraction

Physical ConnectPhysical Connect


PCPCDevice, like modem, Device, like modem, keyboard mouse, etckeyboard mouse, etc

Endpoint

Endpoint

Endpoint


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USBUSBTransfer typesTransfer types

...basics...basics

ControlControl (e.g.: configuration, messages) (e.g.: configuration, messages)- bursty, host initiated (bus management, configuration)bursty, host initiated (bus management, configuration)- guaranteed bandwith of max. 10%guaranteed bandwith of max. 10%- error-free data delivery guaranteederror-free data delivery guaranteed

InterruptInterrupt (e.g.: mouse, joystick....) (e.g.: mouse, joystick....) - small bursty, low bandwidth requiredsmall bursty, low bandwidth required- error-free data delivery guaranteederror-free data delivery guaranteed- polling is used (by host) to check for "interrupt events”polling is used (by host) to check for "interrupt events”- polling intervall programmable. Frompolling intervall programmable. From 1ms1ms to 255ms (FS)to 255ms (FS)

10ms10ms to 255ms (LS)to 255ms (LS) IsochronousIsochronous (e.g.: audio, telephony.....) (e.g.: audio, telephony.....)

- for data which need to be periodically sent for data which need to be periodically sent - predictable latency on data delivery. predictable latency on data delivery. - no error check, error-free data delivery is no error check, error-free data delivery is notnot guaranteed guaranteed

BulkBulk (e.g.: printer, scanner, still camera.....) (e.g.: printer, scanner, still camera.....) - non periodic, bursty, ideal for large amounts of datanon periodic, bursty, ideal for large amounts of data- error-free data delivery guaranteederror-free data delivery guaranteed


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Frame = 1ms

printerprinter

ControControllControControll

USB Frame ModelUSB Frame Modelexampleexample

Stereo Audio

Telephony

SO

FS

OF

low-speed

IsochronouIsochronoussIsochronouIsochronouss

BulkBulkBulkBulk

InterruptInterruptInterruptInterrupt

...basics...basics

printerprinter

any LS device like keyboard, mouse,

etc.

any LS device like keyboard, mouse,

etc.

BulkBulkBulkBulk


16 - 04/19/23, 12:48

max. 5mmax. 5m

CABLE connectorCABLE connector'upstream''upstream'

Connectors and CablesConnectors and Cables ConnectorsConnectors

- 4-Position with shielded housing4-Position with shielded housing- Positive RetentionPositive Retention- Blind Mating CapabilitiesBlind Mating Capabilities


Power pairPower pair

HOST PC / HUBHOST PC / HUB

CABLE connectorCABLE connector 'downstream''downstream'

HUB / DEVICEHUB / DEVICE

Differential Signal pairDifferential Signal pair


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USB Hub FunctionUSB Hub Function

Port ControlPort Control

- Connection detectConnection detect

- Port Enable/ DisablePort Enable/ Disable

- Reset/ Resume SignalingReset/ Resume Signaling

Data SwitchData Switch

- Signal RegenerationSignal Regeneration

- Robustness/ RecoveryRobustness/ Recovery

Power DistributionPower Distribution

UpstreamConnectivity

HubHubRepeaterRepeater

DownstreamConnectivity

HubHubRepeaterRepeater

DisabledPort

EnabledPorts



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Power DistributionPower Distribution

Significant capability of USBSignificant capability of USB- Eliminate wall adaptorsEliminate wall adaptors

Hubs may be self-powered or Hubs may be self-powered or bus-powered bus-powered- Two current levels: 100 & 500 mATwo current levels: 100 & 500 mA- Overcurrent protection for safetyOvercurrent protection for safety- Wire gauge options: 20-28 AWGWire gauge options: 20-28 AWG

SuspendSuspend- All devices support suspendAll devices support suspend- Enter suspend state after seeing Enter suspend state after seeing

idle bus for 3 ms idle bus for 3 ms- Suspend current Suspend current 500 500 A from busA from bus

ResumeResume- USB devices can cause “remote wake-up”USB devices can cause “remote wake-up”

e.g. Modem wakes up the systeme.g. Modem wakes up the system



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Voltage DropVoltage Drop

Voltage drop per wire/connector:Voltage drop per wire/connector: 0.125 V0.125 V Budget for power switch:Budget for power switch: 0.100 V0.100 V

Bus-PoweredBus-PoweredFunctionFunction

Bus-PoweredBus-PoweredHubHub

Host orHost or

Powered HubPowered Hub

4.65V (min) 4.40V (min)


4.0V (as a resulting low value)


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Data SignalingData Signaling

Bi-directional, half-duplex linkBi-directional, half-duplex link

Embedded clock and dataEmbedded clock and data

Differential signal pairDifferential signal pair

12 Mbit / sec Full Speed (FS) bit rate12 Mbit / sec Full Speed (FS) bit rate

1.5 Mbit / sec Low Speed (LS) bit rate1.5 Mbit / sec Low Speed (LS) bit rate



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Low SpeedLow Speed

1.5 Mb/s1.5 Mb/s

- Unshielded, untwisted cableUnshielded, untwisted cable

- Saves EMI suppression costsSaves EMI suppression costs

- 1.5% Frequency tolerance1.5% Frequency tolerance

Driver characteristics Driver characteristics

- Rise/ Fall time: Min 75ns, Max 300nsRise/ Fall time: Min 75ns, Max 300ns

- Required on low speed functions andRequired on low speed functions and on the downstream ports of Hubs on the downstream ports of Hubs

Allows very-low-cost devices to be built without Allows very-low-cost devices to be built without compromising data rate for faster devicescompromising data rate for faster devices

- Mice, keyboards, most user interface peripherals don’t Mice, keyboards, most user interface peripherals don’t need fast data rateneed fast data rate

Eliminates need for shielded twisted pair cable (3 meters)Eliminates need for shielded twisted pair cable (3 meters)

Allows use of less-expensive IC process technologyAllows use of less-expensive IC process technology



22 - 04/19/23, 12:48

USB Connections and TerminationsUSB Connections and Terminations

D-

D+

R1

RR11 = 15K = 15K±5%±5%

RR22 = 1.5K = 1.5K±5%±5%

F.S./L.S. USBF.S./L.S. USBTransceiverTransceiver


(45Outputs)

Host or Hub Port

ZZOO = 90 = 90±15%±15%

5 Meters Max. 5 Meters Max.

F.S. USBF.S. USBTransceiverTransceiverF.S. USBF.S. USB

TransceiverTransceiver(45Outputs)

Hub Port 0or

Full Speed Function

R1

R2

D-

D+

R1

RR11 = 15K = 15K±5%±5%

RR22 = 1.5K = 1.5K±5%±5%



(45Outputs)

Host or Hub Port

3 Meters Max. 3 Meters Max.

L.S. USBL.S. USBTransceiverTransceiverL.S. USBL.S. USB

TransceiverTransceiver(45Outputs)

Low Speed FunctionR1

R2

D+

D-

D+

D-

TwistedTwisted Pair Shielded Pair Shielded


VCC

VCC

GND

GND

GND

GND

UnUntwisted, twisted, UnUnshieldedshielded


23 - 04/19/23, 12:48

Transfer - Transaction - Packet (1)Transfer - Transaction - Packet (1)

Host Software initiates Host Software initiates TransferTransfer from or to a target from or to a target USB Device USB Device

Host software splits up one Host software splits up one TransferTransfer into one or more into one or more TransactionsTransactions

TransactionsTransactions are set up based are set up based on the Device's characteristics on the Device's characteristics (Packet Size, Transfer Type) (Packet Size, Transfer Type)

Transaction n-1 Transaction n-2 Transaction n-3

Transfer n

Transaction n-1



24 - 04/19/23, 12:48


Host Software schedules and Host Software schedules and executes executes TransactionsTransactions during during 1ms Frames1ms Frames

Each Frame consists of Each Frame consists of several Transactions from several Transactions from different Transfersdifferent Transfers


Transfer n

Transaction n-1

1 ms Frame

Transaction n-1



25 - 04/19/23, 12:48


Each Transaction consists of a series of packets

Token Packet defines the Type of Transaction

Data Packet carries the payload to or from a Device

Handshake Packet provides feedback about correct data transfer to sender


Transfer n

Transaction n-1

Token Packet Data PacketHandshake

Packet

1ms Frame

Transaction n-1



26 - 04/19/23, 12:48

Packet FormatsPacket Formats

Sync. Packet IDDeviceAddress

ENDPNr

CRC EOP

8 bits 8 bits 7 bits 4 bits 5 bits 2 bits

Sync. Packet ID Data Field CRCCRC EOP

8 bits 8 bits 16 bits16 bits 2 bits0-1023 bytes

Sync. Packet ID EOP

8 bits 8 bits 2 bits

Token PacketToken Packet

Data PacketData Packet

Handshake/Low Speed Preamble

Sync. Packet ID Frame Number CRC EOP

8 bits 8 bits 11 bits 5 bits 2 bits

SOF Token PacketSOF Token Packet



27 - 04/19/23, 12:48

IN Transaction without errorsIN Transaction without errors

Token PacketToken Packet defines the direction of the succeding Data Packet defines the direction of the succeding Data Packet (here: IN = Data Packet from Device to Host)(here: IN = Data Packet from Device to Host)

Data PacketData Packet carries the payloadcarries the payload

Handshake PacketHandshake Packet reports error free reception of Data Packet reports error free reception of Data Packet

IN Packet from HostData Packet from

USB Device to HostACK Packet from Host

ONE TRANSACTION


Sync EOP SyncPIDData

EOP SyncPIDACK

EOPPID

IN TokenData Packet (Payload)


28 - 04/19/23, 12:48

Low Speed - Full Speed Transaction Low Speed - Full Speed Transaction Protocol overhead for FS and Protocol overhead for FS and

LS Transfers is 13 bytesLS Transfers is 13 bytes

Payload for FS and LS is 8 bytesPayload for FS and LS is 8 bytes FS Transfer : FS Transfer :

13 + 8 = 21 full speed bytes 13 + 8 = 21 full speed bytes timestimes

LS Transfer : LS Transfer : 13 * 8 + 8 * 8 = 168 full speed 13 * 8 + 8 * 8 = 168 full speed byte times (excluding byte times (excluding Preamble)Preamble)

~9,5% of bandwidth wasted~9,5% of bandwidth wasted

Token Data Packet (8 bytes)Hand-shake

one full speed transaction

Preamble

fullspeed

lowspeed

low speed

Token

fullspeed

lowspeed

Preamble Data Packet (8 bytes)Hand-shake



29 - 04/19/23, 12:48

END last foilEND last foil

hl ce m, lehmann usb_tele esc spring.ppt 1 - 9/8/2015, 10:22 start first foil

Documents

lehmann usb

usb d

siemens usb

tele esc

firewire usb focus

agenda usb basics

function slide

low latency ease of