Lantronix DSTni-EX Enable/Disable USBRST Interrupt, Stall, Detect Attach of a USB Peripheral

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Bits	Field Name	Description
8	USB_RST	Enable/Disable USB_RST Interrupt
		1	= enable the USB_RST interrupt.
		0	= disable the USB_RST interrupt (default).
7	STALL	Stall
		Used in target and host modes.
		• In target mode, it asserts when the SIE sends a stall handshake.
		• In host mode, it is set if the USB detects a stall acknowledge during the
			handshake phase of a USB transaction.
		This interrupt is useful if the last USB transaction completed successfully or
		stalled.
6	ATTACH	Detect Attach of a USB Peripheral
		1	= USB detects an attach of a USB peripheral.
		Only valid if HOST_MODE_EN is true. This interrupt signals a peripheral is now
		present and must be configured. The ATTACH interrupt asserts if there are no
		transitions on the USB for 2.5us and the current bus state is not SE0.
		0	= USB does not detect an attached USB peripheral.
5	RESUME	Resume
		This bit is set when the device can resume operation.
4	SLEEP	Sleep Timer
		1	= USB detects constant idle on the USB bus signals for 3 ms.
		Activity on the USB bus resets the sleep timer.
		0	= USB does not detect constant idle.
3	TOK_DNE	Token Processing
		1	= the current token being processed is complete. The microprocessor should
		read the STAT register immediately to determine the endpoint and BD used for
		this token. Clearing this bit (by writing a 1) clears the STAT register or loads the
		STAT holding register into the STAT register.
		0	= token processing is not occurring or has not been completed.
2	SOF_TOK	Start-of-Frame Token
		1	= USB receives a Start-of-Frame (SOF) token.
		0	= USB has not received a Start-of-Frame (SOF) token.
1	ERROR	Error Condition
		1	= an error condition occurred in the ERR_STAT register. The microprocessor
		must read the ERR_STAT register to determine the source of the error.
		0	= an error condition did not occur.
0	USB_RST	USB Reset
		1	= USB decodes a valid USB reset. The microprocessor writes 00h in the
		address register and enables endpoint 0.
		USB_RST is set when a USB reset is detected for 2.5 microseconds. It is not
		asserted again until the USB reset condition is removed and reasserted.
		0	= USB is not decoding a valid USB reset.

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Contents DSTni-EX User Guide Section FivePage Copyright & Trademark LantronixTechnical Support Master DistributorWarranty Contents 1 About This User Guide2 SPI Controller 3 I2C ControllerList of Tables 5 CAN ControllersTable 3-17. Clock Control Register List of Figures 1 About This User Guide Intended Audience ConventionsNavigating Online Notes Notes are information requiring attentionOrganization 2 SPI Controller Theory of OperationSPI Background DSTni SPI ControllerSPI Controller Register Summary Table 2-1. SPI Controller Register SummarySPI Controller Register Definitions SPIDATA RegisterRESET Table 2-2. SPIDATA RegisterCTL Register Interrupt Request EnablePhase Select Wire-OSPISTAT Register Table 2-6. SPISTAT RegisterTable 2-7. SPISTAT Register Definitions Interrupt RequestSPISSEL Register Table 2-10. BCNT Bit SettingsSelectO Signal Table 2-8. SPISSEL RegisterDVDCNTRLO Register DVDCNTRHITable 2-11. DVDCNTRLO Register Table 2-12. DVDCNTRLO Register DefinitionsFeatures 3 I2C ControllerBlock Diagram I2C BackgroundFigure 3-1. DSTni I2C Controller Block Diagram I2C Controller Operating ModesMaster Transmit Mode Table 3-1. Master Transmit Status Codes CodeI2C State Microprocessor ResponseServicing the Interrupt Table 3-2. Codes After Servicing Interrupts Master TransmitTransmitting Each Data Byte Table 3-3. Status Codes After Each Data Byte TransmitsAll Bytes Transmit Completely Master Receive ModeTable 3-4. Master Receive Status Codes Table 3-5. Codes After Servicing Interrupt Master Receive Receiving Each Data Byte Table 3-6. Codes After Receiving Each Data ByteSlave Transmit Mode Slave Receive Mode Bus Clock Considerations Bus Clock SpeedClock Synchronization Bus ArbitrationProgrammer’s Reference I2C Controller Register SummaryResetting the I2C Controller Table 3-7. I 2C Controller Register SummaryI2C Controller Register Definitions Slave Address RegisterGeneral Call Address Enable Table 3-8. Slave Address RegisterData Register Table 3-10. Data RegisterControl Register Table 3-12. Control RegisterTable 3-13. Control Register Definitions Extended Slave AddressStatus Register Table 3-14. Status RegisterTable 3-15. Status Register Definitions Table 3-16. Status CodesStatus Code Clock Control Register Table 3-17. Clock Control RegisterTable 3-18. Clock Control Register Definitions Software Reset Register Extended Slave Address RegisterTable 3-21. Software Reset Register Table 3-22. Software Reset Register Definitions4 USB Controller USB Background USB InterruptUSB Core Serial Interface EngineUSB Hardware/Software Interface Digital Phase Lock Loop LogicMicroprocessor Interface Buffer Descriptor TableFigure 4-1. Buffer Descriptor Table Rx vs. Tx as a Target Device or HostTable 4-1. USB Data Direction Addressing BDT EntriesTable 4-2. 16-Bit USB Address Table 4-3. 16-Bit USB Address DefinitionsTable 4-4. BDT Data Used by USB Controller and Microprocessor USB Controller Determines…Microprocessor Determines… Table 4-5. USB Buffer Descriptor FormatTable 4-6. USB Buffer Descriptor Format Definitions BD OwnerDATA0/1 Transmit or Receive USB OwnershipUSB Transaction Figure 4-2. USB Token TransactionUSB Register Summary Table 4-7. USB Register SummaryDedicated to host mode USB Register Definitions Interrupt Status RegisterTable 4-8. Interrupt Status Register Table 4-9. 16- Interrupt Status Register DefinitionsEnable/Disable USBRST Interrupt Sleep TimerError Condition USB ResetError Register Table 4-10. Error Interrupt Status RegisterTable 4-11. 16- Error Interrupt Status Register Definitions Error interrupt with two functions Data Field Received Not 8 BitsCRC16 Failure PID check field failedLive USB Differential Receiver JSTATE Signal Live USB Single Ended Zero SignalTable 4-12. Status Register Table 4-13. Status Register DefinitionsUSB Reset Signal Host Mode Enable valid for host mode onlyResume Signaling BDT PDD ResetAddress Register Table 4-14. Address RegisterTable 4-15. 16- Address Register Definitions Frame Number Registers Table 4-16. Frame Number RegisterTable 4-17. Frame Number Register Definitions Frame NumberToken Register Endpoint for Token Command Table 4-18. Token RegisterTable 4-19. Token Register Definitions Table 4-20. Valid PID TokensEndpoint Control Registers Endpoint EnableTable 4-21. Endpoint Control Registers Table 4-22. Endpoint Control Register DefinitionsHost Mode Operation Table 4-23. Endpoint Control Register DefinitionsSample Host Mode Operations Figure 3. Enable Host Mode and Configure a Target DeviceFigure 4. Full-Speed Bulk Data Transfers to a Target Device USB Pull-up/Pull-down Resistors Figure 4-5. Pull-up/Pull-down USBUSB Interface Signals USB Output EnableHOST Mode Enable Clock CLK5 CAN Controllers Arbitration and Error Checking CANBUS BackgroundData Exchanges and Communication CANBUS Speed and Length Table 5-1. Bit Rates for Different Cable LengthsCAN Register Summaries Register SummaryHex Offset RegisterHex Offset Detailed CAN Register Map Table 5-4. Detailed CAN Register MapAcceptance Filter Enable Register Hex OffsetRegister CAN Register Definitions TX Message RegistersFigure 5-1. TX Message Routing Sending a MessageTx Message Registers Table 5-5. TxMessage0ID28Table 5-6. TxMessage0ID12 Table 5-7. TxMessage0DataTable 5-12. TxMessage0Ctrl Flags Table 5-13. TxMessage0 Register DefinitionsMessage Identifier for Both Standard and Extended Messages Message DataRX Message Registers Figure 5-2. RX Message RoutingRx Message Registers Table 5-14. RxMessageID28Table 5-15. Rx Message ID28 Register Definitions Table 5-16. RxMessageID12Table 5-20. Rx Message Data Table 5-21. Rx Message Data 39 Register DefinitionsTable 5-22. Rx Message Data Table 5-23. Rx Message Data 23 Register DefinitionsTable 5-26. RxMessage RTR Table 5-27. Rx Message RTR Register DefinitionsTable 5-28. Rx Message Msg Flags Table 5-29. Rx Message Msg Flags Register DefinitionsError Count and Status Registers Table 5-30. Tx/Rx Error CountTable 5-31. Tx\Rx Error Count Register Definitions Table 5-32. Error StatusTable 5-34. Tx/Rx Message Level Register Table 5-35. Tx/Rx Message Level Register Definitionsrxlevel10 txlevel10Interrupt Flags Note The reset value of this register’s bits is indeterminateCRC Error Format ErrorInterrupt Enable Registers Table 5-38. Interrupt Enable RegistersTable 5-39. Interrupt Enable Register Definitions Bus Off State − int2n group error interruptsCAN Operating Mode Table 5-40. Interrupt Enable RegistersTable 5-41. Interrupt Enable Register Definitions Overload Condition − int3n group diagnostic interruptsCAN Configuration Registers Configuration Bit RateFigure 5-3. CAN Operating Mode Table 5-42. Bit Rate Divisor RegisterTable 5-44. Configuration Register Table 5-45. Configuration Register DefinitionsOverwrite Last Message CfgsjwBit Time tseg1 +tseg2 + time quanta TQAcceptance Filter and Acceptance Code Mask Table 5-46. Acceptance Filter Enable RegisterTable 5-47. Acceptance Filter Enable Register Definitions Table 5-48. Acceptance Mask 0 RegisterTable 5-50. Acceptance Mask Register ID Table 5-51. Acceptance Mask Register ID12 DefinitionsTable 5-52. Acceptance Mask Register Data D5556Table 5-54. Acceptance Code Register Table 5-55. Acceptance Code Register DefinitionsTable 5-56. Acceptance Mask Register ID12 Table 5-57. Acceptance Mask Register ID12 DefinitionsCANbus Analysis Arbitration Lost Capture RegisterTable 5-60. Arbitration Lost Capture Register Table 5-61. Arbitration Lost Capture Register DefinitionsError Capture Register Table 5-62. Error Capture RegisterTable 5-63. Error Capture Register Definitions ErrorcodeTable 5-65. Error Capture Register Definitions Frame Reference RegisterTable 5-64. Frame Reference Register Stuff Bit InsertedCAN Bus Interface Interface ConnectionsFigure 5-6. CAN Connector Figure 5-5. CAN Bus InterfaceFigure 5-7. Power for CAN +5CANGNDCAN +24VFigure 5-8. CAN Transceiver and Isolation Circuits 0.01uf