Lucent Technologies USS-720 manual Ieee 1284 Port, Register-Based Operation

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USS-720Instant USB

Preliminary Data Sheet, Rev. 5

USB-to-IEEE1284 Bridge

September 1999

 

 

IEEE 1284 Port

The IEEE 1284 port on the USS-720 is compliant with the IEEE 1284-1994 standard. The parallel port oper- ates in two distinct modes. In fully Automatic Mode, the IEEE 1284 protocol is implemented completely in hard- ware. Compatibility Mode, Nibble Mode, and ECP Mode (with or without RLE compression) are supported, with all negotiation, termination, and other features of the protocol handled transparently by the hardware. The USS-720 also features a Register Mode, which presents a standard register interface to the host. These two modes provide the host with two distinct operating paradigms. In Automatic Mode, the host software interacts with the USS-720 as if with a USB-capable printer; while in Register Mode, the USS- 720 emulates standard PC parallel port hardware. In the Automatic Mode, the host application software doesn’t know that the USB data stream is being converted to IEEE 1284 protocol. In the Register Mode, it need not know that its interaction with parallel port registers is actually talking place remotely over a USB link.

Automatic mode is recommended for almost all appli- cations. (Note: The drivers included in the Lucent Technologies USS-720 Evaluation Kit use only Auto- matic Mode.) Automatic Mode implements all negotia- tion handshakes automatically for Compatibility, Nibble, and ECP modes. In Register mode, the user must do the negotiations manually in software. Register mode can be useful when implementing a nonstandard parallel port interface.

Register-Based Operation

In its Register Mode of operation, the USS-720 emu- lates standard host-side parallel port hardware, with the register accesses being performed remotely over a USB connection. As in the standard register set, the interface mode is controlled by the Mode field in the Extended Control Register. The supported modes and their meanings are given in the Extended Control Reg- ister section on page 5-20,and operation and required software interaction for each of the supported modes are described in the sections that follow.

Standard Mode (000)

In this mode, the parallel port is under full software con- trol, with no form of hardware assist. Software has complete control of all parallel port signals. This mode can be used for negotiations, terminations, proprietary handshake sequences, etc. As in standard host-side parallel port hardware, the parallel port data lines are unidirectional outputs in this mode.

5-14

Bidirectional Mode (001)

This mode is identical to Standard Mode (000), except that the direction of the parallel port data lines may be controlled with the Direction bit in the Control Register.

Compatibility Mode (010)

This mode provides hardware-based Compatibility Mode data transfers. Data sent to the USS-720 over the Bulk Out pipe will be transferred automatically to the peripheral using Compatibility Mode.

ECP Mode (011)

This mode provides hardware-based ECP Mode data transfers. To use ECP, the host software should negoti- ate for ECP Mode via the Control and Status Registers, then set Mode to 011. At this time, the Compress Enable bit in the USS-720 Control Register should also be set appropriately.

EPP Mode (100)

This mode provides hardware-based EPP Mode data transfers. To use EPP, the host software should negoti- ate for EPP Mode via the Control and Status Registers, and then set Mode to 100.

EPP mode in the USS-720 has the following data transfer rate characteristics. Note that the rates are approximate.

Table 18. Transfer Rates

Direction

UHCI

OHCI

 

 

 

Forward

1 Mbyte/s

1 Mbyte/s

 

 

 

Reverse

250 bytes/s

1 Kbyte/s

 

 

 

Because the reverse channel operation is implemented in the USB Control Pipe, the transfer rates are limited according to the particular implementation of the host controller, either UHCI or OHCI.

The high performance of the forward direction in EPP mode makes it attractive for implementations requiring little reverse channel traffic.

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 BridgeIOCTL1284 Terminate USS-720 USB Device Driver Preliminary User GuideIOCTLSET1284REGISTER 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 InstructionsPlug and Play USB Driver and Port MonitorPort Creation 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 DisputesUSS720.INF USS720.SYSDocumentation USS-720 Software Use Agreement February Software Components Application Note, Rev FebruaryPlug and Play Operation PnP Customer-Defined DataPrinter Enumeration Power Management Installation ProcessOperating Systems Supported USB Hardware Types SupportedPrinter Types Supported Print Types SupportedPreliminary Data Sheet, Rev September FeaturesDescription Table of Contents Pin Information Preliminary Data Sheet, Rev USS-720USB-to-IEEE 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 LocationsOnboard Device Descriptor USB-to- Ieee 1284 Bridge SeptemberDevice Descriptor Offset Field Size Value Description USB-to- Ieee Configuration DescriptorInterface Descriptors Bulk Out Endpoint Descriptor, I0A0E1Bulk Out Endpoint Descriptor, I0A1E1 September USB-to-IEEE1284 BridgeBulk In Endpoint Descriptor, I0A1E2 Bulk In Endpoint Descriptor, I0A2E2 Bulk Out Endpoint Descriptor, I0A2E1Interrupt Endpoint Descriptor, I0A2E3 Requests PipesStandard Requests Printer Class-Specific Requests Get Port Status Data Bit DescriptionGET1284REGISTER Vendor-Specific RequestsSET1284REGISTER Ieee 1284 Port Register-Based OperationRegisters GET1284REGISTER Data Byte Register DataInterrupt Pipe Read Data Byte Register DataDefault Bit Symbol Bit Description Status Register Address Bit SymbolParallel Port nFault Signal Reserved 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 ClkhiSetup and Hold Input Timing Parameter Timing CharacteristicsOutput Delay Timing Parameter Min Max Unit 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
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