Connect-Tek USB-2 Manual do Utilizador descarregar pdf

Introduction

Engineers involved in the design, characterization and

validation of USB 2.0 devices face daily pressures to speed

new products to the marketplace. Tektronix comprehensive

tool set enables designers to quickly and accurately perform

electrical compliance tests recommended by the USB-

Implementers Forum, Inc. (USBIF) and quickly debug

their designs.

Universal Serial Bus (USB 2.0) is a connectivity speciﬁcation

aimed at peripherals that connect outside the computer in

order to eliminate the hassle of opening the computer case

to install cards needed for certain devices. USB-compliant

devices translate into ease-of-use, expandability and speed for

the user.

USB 2.0 device designers must properly characterize their

designs and verify compliance to industry standards before

device manufacturers can afﬁx the “certiﬁed” USB-IF logo

to their packaging. The appropriate tool set is critical for

the performance of USB-IF compliance tests, such as eye

diagram and parametric testing for low-speed, full-speed and

high-speed devices and hubs.

Designs with USB 2.0 interfaces usually contain a variety

of signals and buses. Tools that provide complete system

visibility are needed to quickly verify and debug these designs.

These tools need to quickly discover USB 2.0 problems and

then they need to trigger on the problems to capture them.

Next, the tools should easily search, mark and navigate long

record lengths to ﬁnd all problem occurrences. Finally, the

tools should have automated USB 2.0 decode that provides

insight to the design operation to quickly ﬁnd the root cause of

the problem.

The ﬁrst part of this application note focuses on understanding

and performing USB 2.0 physical layer measurements and

electrical compliance testing (electrical and high-speed tests)

and will include a discussion of the instruments required for

each test. The last part of this application note focuses on

debugging designs with USB 2.0 interfaces using a mixed

signal oscilloscope with USB 2.0 triggering, searching and

decoding capabilities.

Understanding and Performing USB 2.0

Physical Layer Testing and Debugging

Application Note

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Resumo do Conteúdo

Página 1 - Application Note

IntroductionEngineers involved in the design, characterization and validation of USB 2.0 devices face daily pressures to speed new products to the mar

Página 2 - USB 2.0 Electrical Tests

Application Note www.tektronix.com/usb10Effect of Oscilloscope Sample Rate on TestingTo capture information at edge speeds as fast as 500 ps, you need

Página 3 - Test Equipment

www.tektronix.com/usb 11Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingTest FixtureThe test ﬁxture is the most crucial compo

Página 4 - Drop Test

Application Note www.tektronix.com/usb12Debugging USB 2.0 DesignsProduct designs with USB 2.0 interfaces usually contain a wide variety of analog and

Página 5 - USB 2.0 High-speed Tests

www.tektronix.com/usb 13Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingTime-Correlated Bus DecodeTime-correlated displays of

Página 6 - CHIRP Test

Application Note www.tektronix.com/usb14

Página 7 - Monotonicity Test

www.tektronix.com/usb 15Understanding and Performing USB 2.0 Physical Layer Testing and Debugging

Página 8 - 2.0 Physical Layer Testing

ConclusionUSB 2.0 technology provides the device designer a migration path for high-performance peripherals that preserve the ease-of-use consumers ha

Página 9 - Layer Testing

Application Note www.tektronix.com/usb2USB 2.0 Compliance Testing BasicsUSB 2.0 is a serial bus that utilizes a 4-wire system — VBUS, D-, D+ and Groun

Página 10 - Signal Source

www.tektronix.com/usb 3Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingWhile performing compliance testing, you need to set u

Página 11

Application Note www.tektronix.com/usb4In-Rush Current CheckBecause USB 2.0 is a hot-pluggable technology, extreme care is required to ensure that the

Página 12 - Debugging USB 2.0 Designs

www.tektronix.com/usb 5Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingTest EquipmentDrop tests require a multi-meter. The op

Página 13 - Search and Mark

Application Note www.tektronix.com/usb6Test EquipmentThe receiver sensitivity test requires a real-time oscilloscope, such as a MSO/DPO5204 or DPO7254

Página 14

www.tektronix.com/usb 7Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingMonotonicity TestWhen performing a USB 2.0 high-speed

Página 15

Application Note www.tektronix.com/usb8Impedance Measurement TestDue to the high signal rates of USB 2.0 High-Speed mode, trace and packaging impedanc

Página 16 - Conclusion

www.tektronix.com/usb 9Understanding and Performing USB 2.0 Physical Layer Testing and DebuggingSelecting Tools for USB 2.0 Physical Layer TestingReal