Developers Conference

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(No Transcript)
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USB 2.0 Production Testing

• Michael Pasumansky
• CATC

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USB Production Testing
What Is in the Presentation

• Production test Vs Validation Test
• Test Environment
• Test Methods
• Test Setup
• Test Coverage
• Test Configuration
• Test results

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USB Production Testing
Production Test vs.Verification Test

• Verification test validates the correctnessof
  the design
• Production test tests specific units of the
  product with the basic assumption that the
  product was designed to spec

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USB Production Testing
Test Environment

• DOS Vs Windows
• Stand alone HW box Vs integrated ATE
• Tester recovery after testing a bad unit
• How to protect the tester USB connectors
• Operator skills

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USB Production Testing
Test Methods

• Method I - Plug a USB mouse to each one of the
  USB ports and check the mouse cursor movement
• Method II - Use a special purpose USB tester that
  was designed to test USB host controllers(OHCI /
  UHCI) and USB hubs

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USB Production Testing
Test Setup andTest Methodology

• Testing USB host root ports

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USB Production Testing
Testing Any USB Ports
Tester Box Programmable USB Device
Hub
DOS test SW
USB HC under test
USB
USB
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USB Production Testing
Test Coverage(USB Host Controller)

• Writing and reading all host controllers
  registers
• Host controller initialization
• FS and LS device enumeration
• FS and LS Data loop-back
• Device connect and disconnect
• Analog measurements of D, D- and VCC

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USB Production Testing
Test Coverage(USB Hub)

• Hub enumeration
• FS and LS connect and disconnect events at every
  downstream port
• FS and LS Data loop-back through each port
• Remote wakeup (all combinations)
• Power management (OC, PWR switching)
• Analog measurements of all downstream ports

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USB Production Testing
Test Configuration /Customization

• Customers require control on what to test and on
  the Go / No Go values
• Special test option to allow the test to pass
  even when there are known issues
• API to enable 3rd party test utilities to use the
  same tester box

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USB Production Testing
Test Results

• Production line operator screen
• Debug screen
• Analog results screen
• USB setup topology report
• Detailed failure description
• Daily test report
• Daily statistical report

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USB Production Testing

• AutoReturnToDOSYes,1000
• TypeOfPortsToBeTestedRoot
• TypeOfUSBHostControllerUHCI
• NumberOfPorts1
• EndOfTestSoundOff
• OHCIBaseAddressD800
• TestLogStatistics
• DefaultScreenDebug
• ConsoleModeYes
• UHCIPix4Irq11
• DisableTest2,3,4,5,6,7,8,9,10,11,12,13
• DisableFunctionKeys9
• EmbeddedPorts2,3
• HubTrafficIndicatorDurationYes,200
• USBLineIdleHigh3.10
• USBLineIdleLow0.11
• USBLineDrivenHigh3.15
• USBLineDrivenLow0.22

• USBLineDrivenHigh3.15
• USBLineDrivenLow0.22
• CHigh5.43
• VCCLow5.00
• VCCLoad700
• OvercurrentValue1500
• OvercurrentDuration300
• PropagationDuration200
• RunTestKeySpace
• PIX3IOSpace
• PIX3IRQ
• PIX3Clock
• USBKeyboardEnabledYes
• PowerSwitchingDelay30
• AutoOCStartFrom40
• AutoOCIncreaseBy1
• AutoOCDelay50

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USB Production Testing

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USB Production Testing
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USB Production Testing
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USB Production Testing
New for 2.0

• USB 2.0 specifics
• Have to test 3 speeds
• Have to talk to multiple host controllers
• Challenges for split transactions for host
  testing
• Cannot test unless a 2.0 hub is connected to the
  host (or the host has an integrated hub)
• It is not feasible to put a 2.0 hub on the tester
• An option can be provided using an external 2.0
  hub between the host and a channel on the tester

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USB Production Testing
Testing USB Devices

• Unlike for HCs and Hubs, cannot be generalized
• Still want full Software control
• Minimize test time
• Perform tasks that are hard to set up with target
  OS driver/application for your device
• Modified Linux USB stack can help, have to do
  modifications yourself
• Can use USB stack for DOS
• Can concentrate on testing the functionality

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USB Production Testing
Summary

• Production test environment, with a focus of the
  specific issues that are related to testing USB
  (Host controllers and USB hubs)
• Different test methods
• Configuration and customization requested by USB
  product manufacturers
• Test coverage and test results