CATC USB Hub Tester User`s Manual
Contents
1. Computer Access Technology A Corporation aa 2403 Walsh Avenue Santa Clara CA 95051 1302 Tel 1 408 727 6600 Fax 1 408 727 6622 CATC UHT USB Hub Tester User s Manual Version 2 1 11 October 1999 Copyright 1997 1999 Computer Access Technology Corporation CATC CATC Inspector Detective and UHT are trademarks of Computer Access Technology Corporation CATC UHT User s Manual Version 2 1 TABLE OF CONTENTS 1 INTRODUCTION unnai a ea case O cesbuctecedevecusebsteessasabessvecs 1 11 USB OVER VIEW r a Ba BOLE CE ER EI it 2 2 CATE UHT SYSTEM isccssssissiscsssensadesessosececosessee sasnseensesevavassevesesdesedsvesvscioesseceeasecesoosesedseesoeesssseeessdesieaioovseessadesaeesss 2 SSA O 4 311 CONNECTORS ANDCABL ES ii titi 5 4 SOFTWARE INSTALLATION ssscsssssocessoseccosedsecssssbecsssbsccecssbessessseecsesouunsessscesecesdcedsscusessescedsuiesssscdacsobscvecssbecteess 5 41 SOFTWARE COMPONENTS a idos 5 A 2 INSTALEING THE SOFWARE acia 5 4 3 RUNNING THE SOFIWA R E id 5 4 3 1 Setting the PIIX4 Interrupt Line Number onoesoeeeeeeeseeeesrerrsresrssrsrrssrsrreresresrsseerresesteesesresrssrenrnsesrreses 6 4 3 Command Eine Options it eea A a EAE A eS 6 5 UHT SOFTWARE FUNCTIONALITY isccccscsssstcscssssvcssscccsessecssesensseshsctecesosesesussecessuceseosssccestuasestocdasecvenseasadensonss 9 Ss MAUR TEST INITIALIZATION dd e Y EOE E YAE TEA E E E T ile 9 2 PORTTEST SEQUENCE EEE E E E E E E E A E 10 JI OVERCURRENT PROTE2. s Website http www catc com 7 WARRANTY Computer Access Technology Corporation hereafter CATC warrants this product to be free from defects in material content and workmanship and agrees to repair or replace any part of the enclosed unit that proves defective under these terms and conditions Parts and labor are warranted for one year from the date of first purchase This warranty covers all defects in material or workmanship It does not cover accidents misuse neglect unauthorized product modification or acts of nature Except as expressly provided above CATC makes no warranties or conditions express implied or statutory including without limitation the implied warranties of merchantability and fitness for a particular purpose CATC shall not be liable for damage to other property caused by any defects in this product damages based upon inconvenience loss of use of the product loss of time or data commercial loss or any other damages whether special incidental consequential or otherwise whether under theory of contract tort including negligence indemnity product liability or otherwise In no event shall CATC s liability exceed the total amount paid to CATC for this product Page 17
3. Controller At the end of the test the software provides a listing of on screen results If all tests were successful the software declares the hub under test to be functional In the case of faulty devices the software provides a detailed description of the test results in a fal file it also accumulates the failure rate for the entire testing day in a sta file The UHT tester performs the following tests 1 hub enumeration 2 hub reset suspend and resume operation 3 connection and enumeration of a low speed device on each downstream port 4 data loop back integrity test with a low speed device on each downstream port 5 connection and enumeration of a full speed device on each downstream port 6 data loop back integrity test with a full speed device on each downstream port 7 individual port suspend and resume operations on each downstream port 8 remote wakeup detection and propagation from each of the downstream ports 9 hub initiated remote wakeup on connect disconnect events 10 hub overcurrent detection and reporting to the host Page 1 CATC UHT User s Manual Version 2 1 11 overcurrent protection gang or per port configuration 12 downstream current restoration overcurrent removed A complete test of a hub with four downstream ports takes about 10 seconds For hubs that fail these tests a CATC Inspector or Detective USB Bus amp Protocol Analyzer can be used to assist in debug and r
4. activate the unit plug the AC to DC converter s into appropriate AC power outlet s In the USB test system connect the CATC UHT box es as follows A Connect a USB cable between the upstream port of the USB hub under test and the USB port of the host PC B Connect a USB cable between the first downstream port of the USB Hub to be tested and the USB connector labeled CH 1 on the first CATC UHT box C Repeat step B for the next and any additional ports to be tested connecting to CH 2 CH 3 and CH 4 in sequence For hubs with more than four ports continue connecting them to CH 1 through CH 4 of the second UHT box as required If less than four downstream ports are being tested the unconnected test channels on the UHT box should be the higher numbered ones e g if only two hub ports are being tested they should be connected to CH 1 and CH 2 Similarly if more than four ports are being tested all channels of the first UHT box must be filled and unconnected channels on the second box should be the higher numbered ones With one exception downstream ports on the hub under test can be connected to the UHT box in any order this will only affect the sequence in which the ports are tested the software will first test the port connected to CH 1 then that connected to CH 2 and so on for any remaining ports continuing to the second box when appropriate The exception
5. i e ports assigned to permanently attached ports are assumed valid port devices such as a monitor that will not be included in the hub test operations 0 120 power switching test Max delay is 120 msec msec H n n from Selects one of the following current value ranges See Default 0 10 for the overcurrent test 0 100 200mA Overcurrent Test 1 250 450mA 2 650 850mA Levels table 3 1 3 1 5A 4 2 0 2 2A 5 2 3 2 5A 6 3 0 3 2A 7 3 8 4 0A 8 4 4 4 6A 9 4 64 8A 10 4 7 5 0A Note these current ranges are approximate and may vary 10 due to temperature individual components etc En n from Set PILX4 interrupt line in USB host controller to Use IRQ as set by 3 F specified IRQ number unless already set by the BIOS BIOS see Setting the PILX4 Interrupt Line Number above Page 7 CATC UHT User s Manual Version 2 1 M n n from Specifies a particular mode of overcurrent testing Use mode as 14 1 test per port individual overcurrent specified by hub protection descriptor 2 test global ganged overcurrent protection 3 test both per port amp global overcurrent protection 4 special mode used only with hubs that imple ment per port overcurrent protection but report overcurrent events as global 1 e as hub rather than port overcurrent conditions 6 special mode provides per port OverCurrent test for hubs that shut down power to all downstream ports when an Over
6. in Port Test Sequence 6 described below Note that the USB standard specifies 50us or less for this operation X n n from Specifies the time in milliseconds for which a X 0 no traffic 0 10000 heavy USB traffic load will be generated during the test of the final port in the sequence both low and full speed used to test some hubs that monitor bandwidth Displays this help information N A Examples 1 USB_UHT s off p 3 Test three ports without activating the indicator sound 2 USB_UHT a c gt test res Terminate automatically one second after the test and send the output to a file named test res 3 USB_UHT d 2 6 e 1 Omit tests for Get Bus State request amp overcurrent protection and exclude testing of port 1 5 UHT SOFTWARE FUNCTIONALITY The DOS based UHT software runs on the USB host it communicates with the UHT box via the USB host controller on the motherboard and the USB hub under test For each USB port the software program checks for proper operation in both full and low speed modes When all tests are successful the software declares the USB hub to be functional any failures are reported on the computer display screen and saved on the hard disk as a text file Initially the test program attempts to determine using the PCI protocol whether or not the host system is equipped with a USB Host Controller if such a controller is not found the program aborts with an explanatory error
7. message 5 1 Hub Test Initialization Once a USB host controller is identified the UHT application proceeds to 1 find a hub attached to one of the host USB ports initialize the hub and assign it an address read its general device amp configuration descriptors and set the configuration to the hub read the hub specific device class descriptor and decode it determining hub type instruct the hub to provide power to the downstream ports and PE TO begin polling the hub Status Change endpoint in order to get the connect notification The program then tests each hub port using the following functional test sequence Page 9 CATC UHT User s Manual Version 2 1 5 2 Port Test Sequence Each of the following functions is tested in sequence in both full and low speed modes for each downstream hub port 1 Connect event processed as done by a USB enabled operating system 2 initialization of the USB device incorporated in the UHT box and data loopback sequence During data loopback a set of 75 random data bytes is sent to the UHT box on its OUT bulk endpoint and then read back on one of its IN bulk endpoints this procedure is repeated twice 3 verification that power is provided to the USB port and for hubs with per port power control that power can be turned on and off using SetPortFeature PORT_POWER 4 individual port suspend resume The hub port to which the UHT box is currently connected is suspend
8. 4 SOFTWARE INSTALLATION 4 1 Software Components The CATC UHT software consists of the following files included on the supplied diskette e USB_UHT EXE executable code of the CATC UHT program e USB_UHT CFG configuration text file for the USB host controller used only for Intel PITX3 UHCI systems 4 2 Installing the Software Make a copy of the CATC diskette for backup then copy its contents to the hard drive of the USB capable PC to be used as the test system host 4 3 Running the Software The UHT software program usb_uht exe is a DOS application and must be run under the DOS operating system It supports both UHCI and OHCI USB host controller implementations the latter however requires use of the O command line option see the table below for further details The program scans the PC s PCI devices and locates the USB host controller by class code It uses the first host controller it finds as the test target On some systems with a USB aware BIOS the software may fail to communicate with the USB host controller should this occur contact CATC technical support see How to Contact CATC To run the program type USB_UHT at the DOS prompt and press the Enter key The program will clear the monitor screen and begin execution During the test the program displays the test results on the monitor screen The tests conclude in less than 10 seconds leaving the test results on the screen To terminate the progra
9. CTION LESTING A ideada 11 yA TES Bd ol Sh G A OEE e E E E da E E E E 12 3 4 1 Test Results Monitor Display vrerin aa a E aaa a aaia 12 DA DAT est Resuli EDS AE ee a ba bab ae a ae ss EEE 2 13 IAS Test Results Erv0r EVET a RA eA a Ascend Hee 14 5 5 CONFIGURATION FILE FOR INTEL PIIX3 UHCI SYSTEMS ONLY c cccesssesscecesscesscecsseeseseecsaeeeeeeecsseeseeeeesaeenses 16 6 HOW TO CONTACT CAT Coiscccssssisesssssisscosesiessssvscensasesiecssevescssesetivesvectscesetesisesbevossssonssdessaassssssssssieedsossssecoseeeees 17 TEA Y N D sossedessesstueucseseseasdesauedeeeseduscsessussdvaseasceseuteesesexacaessasteascvassecsdsseaeesesees 17 CATC UHT User s Manual Version 2 1 1 INTRODUCTION The CATC UHT USB Hub Tester is a modular unit designed for use on the production line to test USB Hubs for proper functionality according to the USB specifications The UHT system is designed to test the one upstream port and up to 4 of the downstream ports of the hub under test If the hub has more than 4 ports a second UHT unit can be used The following diagram illustrates the UHT system connection USB Host System USB HUB Device under test PO Pl P2 P3 P4 P5 P6 Optional CATC UHT CATC UHT USB Hub Tester USB Hub Tester unit 2 The UHT system includes a box hardware and a DOS application program software that controls the test process by communicating directly with the PC USB Host
10. Current event 1s detected O Enables operation of the UHT software with an Test as UHCI USB OHCI USB controller Important Note there has controller been widespread distribution of early OHCI host controllers that do not properly implement the USB protocol standard with respect to hub functionality In particular it is quite common for suspend resume operations to malfunction If disabling test stages 3 and 5 with D 3 5 allows the test to run with no other errors this is likely the cause Contact the silicon vendor or CATC for further information on this issue P n nfrom Specifies the number of USB ports to be tested If P 4 four ports 1 8 P 1 is specified the software omits those test stages that require the connection of a second device Get Bus State request and both types of Remote Wakeup S ONIOFF Turns the end of test indicator sound on or off S ON sound on T n n from Specifies the time in milliseconds for which T 40 40ms 0 20000 current will be applied during the overcurrent test This time will be rounded up to the nearest integer multiple of 40ms IV Interrogates the UHT box and reports version N A numbers of the UHT software and firmware Page 8 CATC UHT User s Manual Version 2 1 W n n from Specifies the time in microseconds with an W 100 100us 1 2000 accuracy of 10us that the UHT box will wait for a Remote Wake Up signal to be propagated to a downstream port
11. _value passed_ports_base failed_port_value result_code 100 result_code passed_ports_base 100 if result_code gt 30000 switch result_code case 30000 printf n Problem initializing hub n break case 30001 printf n Hub under test not connected to host n break case 30002 printf n Hub Tester Device not connected to hub n break case 30003 printf n Bad global overcurrent protection n break return if passed_ports_base 0 zero means no ports fully passed printf Passed at ports temp_value passed_ports_base for i 1 i lt 8 1 if temp_value 2 2 lt temp_value odd number printf Sd 1 if temp_value 1 break temp_value temp_value 2 printf n temp_value failed_port_value 10 printf n Failed on port d at temp_value 1 temp_value failed_port_value temp_value 10 if temp_value gt 4 printf low speed n temp_value 5 jelse printf full speed n printf An Failed stage Page 15 CATC UHT User s Manual Version 2 1 switch temp_value case 0 printf Data n break case 1 printf Connect Disconnect n break case 2 printf Power n break case 3 printf Remote Wakeup n break case 4 printf Overcurrent Protection n break 5 5 Configuration File for Intel PITIX3 UHCI systems only If the system under test h
12. as a BIOS that disables the USB portion of the Intel PITX3 Host Controller the UHT software will enable it for the duration of the test and then restore the previous settings In order to run the test the software needs certain information about the controller configuration the I O base address for PIIX3 function 2 USB portion the IRQ assigned to the host controller and the USB Clock Selector if host controller runs at 24 or 48 MHz In order to provide this input a configuration text file usb_uht cfg is included with the VHT software containing two lines as in the following example VO Space IRQ Clock OxF 300 id 48 This file should be used to provide input for the above cases If the cfg file is not present the program will use the default values as shown above OxF300 11 48 For the clock input only two values are accepted 24 and 48 any other values are ignored and 48 used as a default The I O base address should be entered in hexadecimal IRQ as an integer The values in usb_uht cfg are used by the program only when the USB Function 2 in PITX3 is disabled by the BIOS Page 16 CATC UHT User s Manual Version 2 1 6 HOW TO CONTACT CATC Call for technical support US and Canada 1 800 909 2282 Worldwide 1 408 727 6600 Fax your questions Worldwide 1 408 727 6622 Write a letter Computer Access Technology Corp Customer Support 2403 Walsh Avenue Santa Clara CA 95051 1302 Visit CATC
13. cts between functions 4 and 5 above and disconnects between functions 9 and 10 a full speed device on some other hub port the port connected to the next channel on the UHT box This is required for testing the Get Bus State request function 5 and both aspects of Remote Wakeup functions 6 and 8 If only one downstream port is being tested these tests are necessarily omitted 5 3 Overcurrent Protection Testing The UHT box tests overcurrent protection by drawing a predetermined amount of current from a variety of available values for a brief lt 100ms period of time The amount drawn depends on how the test hub is powered from the bus or its own local supply and whether it implements global ganged or per port individual overcurrent protection Further a hub may have a designed current trip point that differs from that normally tested by the UHT device for this reason the H switch enables the specification of a variety of current draws ranging up to a full 5 Amperes The following table enumerates the standard default test levels Default Overcurrent Test Levels Hub Overcurrent Hub Power Type Approximate Protection Type Current Draw self powered 2 3 2 5A per port individual 250 450mA self powered 650 850mA Note the above current ranges are approximate and may vary 10 due to temperature individual components etc Page 11 CATC UHT User s Manual Version 2 1 5 4 Test Results 5 4 1 Test Resu
14. e used to connect the UHT box to the hub under test The power connector is used to power the box from the AC to DC power converter when power is applied the red LED marked PWR is illuminated The yellow LED marked DATA is a status indicator it blinks at a high rate to indicate that the on board microcon troller is functioning properly and at a low rate when the box is performing a test sequence The green LED marked CURRENT illuminates briefly when an overcurrent test is being performed Page 2 CATC UHT User s Manual Front Panel PWR DATA CURRENT CH 4 CH 3 CH 2 CH 1 00 0 Version 2 1 Rear Panel 9V DC The DOS based UHT software runs on the USB host it communicates with the UHT box via the USB host controller on the motherboard and the USB hub under test For each USB port the software program checks for proper operation in both full and low speed modes When all tests are successful the software declares the USB hub to be functional any failures are reported on the computer display screen and saved on the hard disk as a text file Page 3 CATC UHT User s Manual Version 2 1 3 SYSTEM SETUP Position the CATC UHT box on the test bench near the USB hub to be evaluated If a hub with more than four ports is to be tested position a second UHT test box nearby Connect the DC plug s of the AC to 9V DC 500mA power converter s to the 9V power receptacle s of the CATC UHT box es To
15. ed for 50ms and the UHT box verifies the presence of both Suspend and Resume events 5 optional Get Bus State diagnostic request state is returned or STALL 6 propagation of the device generated Remote Wakeup signaling upstream and to enabled USB ports during suspend The hub under test is suspended while two ports on it have devices connected and enabled Then after approximately 50ms the UHT box sends a Remote Wakeup signal on one of those ports The hub is supposed to propagate this signal upstream to the host and downstream to the other enabled port This behavior is verified by host software in cooperation with the UHT box 7 handling of Remote Wakeup from a suspended port on an awake hub The software suspends the hub port to which the UHT box is currently connected Then after approximately 50ms the UHT box sends a Remote Wakeup signal on this port The hub is supposed to complete the Resume signaling on this port and notify the host about the change which it does by sending the Hub Bitmap with the corresponding port bit set from the Status Change interrupt endpoint and also by setting the C_PORT_SUSPEND bit in the Hub Status This functionality is verified by the UHT system 8 generation of the upstream Remote Wakeup signal upon connect disconnect event during suspend The hub under test is suspended while two ports on it have devices connected and enabled Then after approximately 50 100ms the UHT box creates a disco
16. ework 1 1 USB Overview USB is an open industry standard providing a simple and inexpensive way to connect up to 127 devices to a single computer port Keyboards mice tablets digitizers scanners bar code readers modems printers and more can all run at the same time USB devices plug into any platform that supports the standard from notebooks to desktop PCs to workstations USB is a dynamically reconfigurable serial bus with an elementary data rate of 12 000 000 bits sec based on off the shelf low cost micro controller technology Its modular layered software protocol supports sophisticated device drivers and application programs Please refer to the USB Specifications for details on the USB protocol The USB specifications are available from the USB Implementers Forum at USB IF M S JF2 51 Tel 1 503 264 0590 2111 NE 25th Avenue Fax 1 503 693 7975 Hillsboro OR 97124 Web _http www usb org 2 CATC UHT SYSTEM The CATC UHT package includes the following components e a sturdy metal box housing the UHT electronic test circuitry based on the Intel 8x930 USB controller e an AC to DC power converter e four USB cables e adiskette with the CATC UHT DOS software program e this user s manual The UHT box is an intelligent USB device It has four female B type USB connectors and three LEDs on the front of the unit and a 9V DC 500mA power connector on the rear The USB connectors marked CH 4 through CH 1 ar
17. is when a hub with 5 6 or 7 ports is being tested in this case it is important for the UHT software to know which is the second UHT box so it can tell the difference between unused connections and hub ports that are not working This is accomplished by requiring that the hub port connected to CH 1 of the first box be numbered lower than the hub port connected to CH 1 of the second box The CATC UHT Hub Tester hardware is now ready for operation Note To observe bus traffic a CATC Inspector or Detective USB Bus amp Protocol Analyzer can be connected between the CATC UHT box and the hub under test or between the hub and the USB Host PC Page 4 CATC UHT User s Manual Version 2 1 3 1 Connectors and Cables All connectors have a limited life 1 e number of connect disconnects before failure When testing multiple hubs be sure to plug and unplug cables at the hub only not at the UHT box or the USB host There is generally no need to disconnect the B type USB connectors from the UHT box or the A type connector from the host PC There is also no need to power down the UHT box between tests Additionally forceful or otherwise improper connection and disconnection of USB cables can damage the cables and connectors on the CATC UHT box the USB host PC and the hub under test Note that the CATC Warranty see Warranty and License specifically excludes damage caused by this kind of product misuse
18. istics for the current day the number of units passed and the number of units failed In the fal file is recorded a failure description for each failed unit as follows Failure n Unit m Before failure passed for ports nl n2 or NONE Failed for Port n at speed Failed items followed by one or more of Bad connect handling Error initializing Hub Tester device Wrong data on data loopback Power is not provided to the port Bad handling of port Suspend Resume commands Bad connection of the second device Get Bus State request failed Bad propagation of device generated Remote Wakeup upstream Remote Wakeup wasn t propagated downstream Bad handling of Remote Wakeup from suspended port on awake hub Hub didn t send Remote Wakeup on disconnect event Bad disconnection of the second device Page 13 CATC UHT User s Manual Version 2 1 Bad individual overcurrent protection Bad disconnect handling 5 4 3 Test Results Error Levels Upon termination the UHT application sets the DOS error level according to the test results If the test passed it exits with error level 0 otherwise it exits with a corresponding error level This feature allows processing of the test results in a batch file or when the program is spawned as a child process by another application The error level result_code is calculated as the sum of two components result_code passed_ports_code failed_port_code The passed_ports_c
19. lts Monitor Display Results of the tests are displayed on the computer monitor screen a color monitor is preferred as results are color coded If all test functions succeed the overall test is declared passed otherwise it is reported as failed Following is a typical UHT displayed result for a passed test Found Hub with VENI aE XXXX PRO Data Connect Power Remote Over Disconnect Wakeup Current Full Speed Port 1 OK OK OK OK OK Low Speed Port 1 OK OK OK OK OK Full Speed Port 2 OK OK OK OK OK Low Speed Port 2 OK OK OK OK OK Full Speed Port 3 OK OK OK OK OK Low Speed Port 3 OK OK OK OK OK Full Speed Port 4 OK OK OK OK OK Low Speed Port 4 OK OK OK OK OK TEST PASSED Note Port numbers are displayed in the order tested which may not be in strict numerical sequence as shown in the above example For failed tests the results may differ as follows e The Data test result will be changed to BAD if initialization of the UHT box failed or data received during the data loopback test doesn t match the expected data or suspend resume of an individual port doesn t work or the Get Bus State request failed e The Connect Disconnect test result will be changed to BAD if there was an error or time out during processing of Connect or Disconnect events e The Power test result will be changed to BAD if the UHT doesn t sense the power provided on the hub port or fails
20. m and get back to the DOS prompt press any key Page 5 CATC UHT User s Manual Version 2 1 4 3 1 Setting the PITX4 Interrupt Line Number In some computers the BIOS does not set the PILX4 interrupt line and as a result the USB host controller interrupt line remains disabled The UHT software allows setting of the PILX4 interrupt line number using the I N option where N is the IRQ number of the USB host controller in the range 3 F If the IRQ setting is done by the BIOS the I option is not required When thus directed the UHT software reads the Interrupt Line Register contents function 2 If a valid interrupt line number 3 F is found it uses this interrupt number even if the I option specifies a different IRQ number If an invalid interrupt value is found not 3 F the driver alerts the user with a screen message stating that an invalid interrupt number was found and requests the use of the I option to specify a valid IRQ value Ignoring the I option when a valid IRQ number is detected allows the user to use the same software configuration to run the UHT tester on different systems where some need this option and some do not When the I option is used the driver writes the specified IRQ number to both the Interrupt Line Register and the PIRQD Route Control Register function 0 and clears the Interrupt Routing Enable bit of the latter 4 3 2 Command Line Options The test program supports a variety of co
21. mmand line options To use these options type USB_UHT at the DOS prompt followed by one or more of the following options and press the Enter key Note that option switches may be either upper or lowercase Command Line Options A n n from Specifies an integer value representing the number Wait for operator 0 32768 of milliseconds to wait at the end of the test before to press a key terminating without waiting for the operator to press a key The maximum value of n is 32 768 Default value of approximately 32 8 seconds n is 1000 IC Sends all screen output to the console so it can be Display screen redirected to a file or communication port output only Page 6 CATC UHT User s Manual Version 2 1 D n1 n2 Disables one or more of the following test stages All test stages are 1 port Suspend Resume 2 Get Bus State request 3 propagation of Remote Wakeup from the downstream device 4 Remote Wakeup from suspended port on awake hub 5 hub generated Remote Wakeup 6 Overcurrent Protection 7 individual port power switching Note Stages 3 4 amp 5 are individual parts of the Remote Wakeup test to disable the entire test disable all three stages Similarly stages O amp 7 are components of the downstream power test to disable the full test disable both stages E n1 n2 Specifies number s of one or more embedded No embedded n any ports
22. nnect event on one of these ports The hub is supposed to respond to this by sending a Remote Wakeup signal to the host The software verifies this functionality After the Resume signaling is completed by the host the disconnect event is processed 9 optional port overcurrent reporting This function is executed for each port only if the software determines from the Hub Descriptor that the hub implements per port individual overcurrent protection For this test the software instructs the UHT box to create an overcurrent condition on the port under test and expects the hub to shut down the power to this port and report the condition which the hub does by sending the Hub Bitmap with the corresponding port bit set from the Status Change interrupt endpoint and also by setting the C_LPORT_OVER_CURRENT bit in the Hub Status Then after about 50ms the software instructs the hub to restore power to the port and processes the UHT device connection on this port in order to proceed with the test If the hub supports Page 10 CATC UHT User s Manual Version 2 1 global ganged overcurrent protection the testing is done in a similar fashion but at the end of the test i e after completing the set of individual port tests 10 Disconnect event The UHT box is instructed to disconnect itself from the current port Channel and reconnect after some time at a different port and or speed During the test of each port the system conne
23. ode portion allows determination of which ports completely passed the test before the failure occurred the failed_port_code portion allows determination of which port failed at what speed and at which test stage Five test stages are specified per the test results screen Data DT Connect Disconnect CD Power PW Remote Wakeup RW and Overcurrent OC The failed_port_code is computed as follows failed_port_code failed_port_number 1 10 failure_code where failure_code is chosen according to this table Full Speed The passed_ports_code is computed as the sum of 2 passed_port_number 1 100 for all ports successfully passing the test There are also four special cases e Initialization of the hub failed result_code 30000 e The software doesn t detect a hub connected to the host when the test begins result_code 30001 e The software doesn t detect a UHT box connected to the hub under test when the test begins result_code 30002 e The individual ports passed but the Global Overcurrent protection test failed result _code 30003 Page 14 CATC UHT User s Manual Version 2 1 The following code fragment demonstrates how the result_code returned by the UHT application might be interpreted in software This C language function takes result_code as a parameter and prints out the decoded test results void Decode_UHT_test_results int result_code int i temp
24. the power switching test on per port power controlled hubs e The Remote Wakeup test result will be changed to BAD if the device or hub generated Remote Wakeup wasn t properly propagated or sent or to N A if connection of the second device failed see Port Test Sequence above Page 12 CATC UHT User s Manual Version 2 1 e The Overcurrent test result will be changed to BAD if the hub reported an overcurrent event and then failed in subsequent processing or to if the overcurrent event was created but the hub didn t report it In the latter case the following message as appropriate to the overcurrent test in question will appear at the bottom of the test screen xxx Didn t trip on test current value Note If at the beginning of a test the UHT software senses that the UHT box is not connected to any of the hub s USB ports the program declares a test failure displaying the message Found Hub with VENI 251 XXXX PRO The Hub Tester Device is not connected to the hub TEST FAILED 5 4 2 Test Results Disk Files The UHT application always generates two text files one with the extension sta another with the extension fal The root name of both files is constructed from the current date as yy_mm_dd For example on July 3rd 1998 the file names would be 98_07_03 sta and 98 07 _03 fal In the sta file the program records production stat
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