Lucent Technologies USS-720 manual Description

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Typical Circuit Showing the USS-720	Application Note
Bridging USB to Parallel Port	February 1999

Description (continued)

Whenever device descriptor data is requested, the USS-720 drives both control pins CS (pin 35, Serial ROM Chip Select) and SK (pin 34, Serial ROM Clock). The USS-720 then looks for a response on DIO

(pin 36, Serial ROM Data Signal). If there is no external device connected, and no data is present on the DIO pin, then the descriptor data is taken from the internal ROM. The USS-720 accesses this data through a MicroWire* ROM Interface. One method for this is to use an EEPROM such as the 93CS56L/66L. The USS- 720 Evaluation Kit is speciﬁcally designed for use with this part. Substitution components must be pin and functional compatible with the 93CS56L/66L. 93C56L/ 66L, 93CS46L, and 93C46L EEPROM parts will not work. The connection scheme for this device is shown on the attached schematic. The circuit diagram assumes that a preprogrammed EEPROM is used.

Note: Developers using the USS-720 must use an external serial EEPROM (or the equivalent) in their design and create their own hex data ﬁle for use in programming the EEPROM at their site. The conﬁguration data stored in this serial EEPROM is used by the Microsoft host software during the enumeration to load the appropriate drivers. Using unique identiﬁcation data in the EEPROM provides a means for the developer to ensure that only their software is loaded for use with their device. Otherwise, the enumeration of a camera using the USS-720 could cause the software for a USS-720-based printer to be loaded, resulting in a system that does not func- tion correctly.

See the Device Descriptor, Conﬁgurations, and Interfaces section in USS-720USB-to-IEEE 1284 Bridge Data Sheet for more information on device descriptors.

*MicroWire is a registered trademark of Advanced Interconnection Technology, Inc.

6-2	Lucent Technologies Inc.

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Contents Introduction Information Manual, Rev SeptemberTable of Contents Information Manual, Rev Evaluation Kit for USS-720 September USB-to-IEEE BridgeIOCTLSET1284REGISTER USS-720 USB Device Driver Preliminary User GuideIOCTL1284 Terminate USS-720 USB Port Monitor Application Note Evaluation Kit Contents Hardware Requirements \SAMPLESOSR2.1 Cable Installation Instructions Getting Started InstructionsSoftware Updates Windows 98 Cable Installation InstructionsPort Creation USB Driver and Port MonitorPlug and Play Eeprom Lucent Technologies Inc Lucent Technologies Microelectronics Group In-System Design, IncUSB Applications Support September Evaluation Kit Software USS-720 Driver Software Object Code License AgreementFebruary IntroductionUSS-720 Software Use Agreement February Licensed SoftwareFurnishing of Licensed Software OwnershipUSS-720 February Software Use AgreementWarranty and Indemnity Agreement PrevailsNothing Construed 04 ConﬁdentialityPublicity NonassignabilityAddresses IntegrationApplicable Law DisputesDocumentation USS720.SYSUSS720.INF USS-720 Software Use Agreement February Software Components Application Note, Rev FebruaryPrinter Enumeration Customer-Deﬁned DataPlug and Play Operation PnP Power Management Installation ProcessOperating Systems Supported USB Hardware Types SupportedPrinter Types Supported Print Types SupportedDescription FeaturesPreliminary Data Sheet, Rev September Table of Contents USB-to-IEEE Preliminary Data Sheet, Rev USS-720Pin Information Parallel Port nAutoFd Signal Active-Low Parallel Port nSelectIn Signal Active-LowParallel Port nInit Signal Active-Low Parallel Port nAck Signal Active-LowOverview USB PortDevice Descriptor, Conﬁgurations, and Inter- faces Descriptor LocationsDevice Descriptor Offset Field Size Value Description USB-to- Ieee 1284 Bridge SeptemberOnboard Device Descriptor USB-to- Ieee Conﬁguration DescriptorInterface Descriptors Bulk Out Endpoint Descriptor, I0A0E1Bulk In Endpoint Descriptor, I0A1E2 September USB-to-IEEE1284 BridgeBulk Out Endpoint Descriptor, I0A1E1 Interrupt Endpoint Descriptor, I0A2E3 Bulk Out Endpoint Descriptor, I0A2E1Bulk In Endpoint Descriptor, I0A2E2 Standard Requests PipesRequests Printer Class-Speciﬁc Requests Get Port Status Data Bit DescriptionSET1284REGISTER Vendor-Speciﬁc RequestsGET1284REGISTER Ieee 1284 Port Register-Based OperationRegisters GET1284REGISTER Data Byte Register DataInterrupt Pipe Read Data Byte Register DataParallel Port nFault Signal Reserved Status Register Address Bit SymbolDefault Bit Symbol Bit Description Control Register Address Bit Symbol Access Default Bit Symbol Bit DescriptionParallel Port nInit Signal USB-to-IEEE1284 BridgeUSS-720Instant USB ECP Command Register Address Bit Symbol Access Extended Control Register Address Bit Symbol Mode20 DescriptionUSS-720 Control Register Address Bit Symbol USS-720 Setup Register Address Bit Symbol Interrupts External Circuitry Requirements External Crystal ConnectionFilter Bypass Mode High Drive ModeSelf-Powered Mode Absolute Maximum Ratings Parameter Symbol Min UnitElectrical Characteristics Parameter Symbol Test Conditions Min Typ Max UnitCapacitance Values Parameter Unit Clklo ClkhiOutput Delay Timing Parameter Min Max Unit Timing CharacteristicsSetup and Hold Input Timing Parameter Outline Diagram Ordering InformationPin Mqfp Device Code Package ComcodeApplication Note February Description Parallel PortBridging USB to Typical Circuit Showing USSLucent Technologies Inc Signal Directions Preliminary User Guide, Rev FebruaryIOCTL1284 Setmode Initialization O File FunctionsPreliminary User Guide, Rev USS-720 February USB Device DriverCreateFile Error Codes ReadFileWriteFile DeviceIoControl CloseHandle O Control Codes Control Code DescriptionIOCTL1284 Ecpfwdtorev ParametersIOCTL1284ECPREVTOFWD IOCTL1284 Ecpsetchannel Register Mode Description IOCTL1284 SetmodeIOCTL1284 Terminate Ioctlabortpipe Value DescriptionBulkoutpipe BulkinpipeIoctlcancelpiperequest IOCTLGET1284REGISTER Ioctlgetaltsetting ALTINTERFACE0ALTINTERFACE1 ALTINTERFACE2Ioctlgetcapabilities Ioctlgetconfigurationdescriptor Ioctlgetdevicedescriptor Ioctlgetdeviceinstances Ioctlgetinterface Ioctlgetportstatus Bit MeaningIOCTLISSUEUSS720COMMAND Command DescriptionIoctlreadinterruptpipe Byte DescriptionIoctlresetpipe IOCTLSET1284REGISTER Ioctlsetaltsetting Ioctlsoftreset O Control Data Structures DeviceinstanceheaderDeviceinstance Data StructureREGISTER1284 REGISTER1284, *PREGISTER1284ADVREGISTER1284 ADVREGISTER1284, *PADVREGISTER1284Lucent Technologies Inc USS-720 USB Port Monitor USS-720 Application Note USB Port Monitor February Printer Cable with Instant USBSoftware Installation Instructions W98USS720EvalKit2402.zip to download the installation ﬁlesApplication Note June Click on Enter LibrarySeptember MN99-052CMPR-1 Replaces MN97-061CMPR-04