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Lantronix DSTni-EX Interrupt Flags, Note The reset value of this register’s bits is indeterminate

Models: DSTni-EX

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Interrupt Flags

The following flags are set on internal events (they activate an interrupt line when enabled). They are cleared by writing a ‘ 1’ to the appropriate flag. Acknowledging the tx_msg interrupt also acknowledges all tx_xmit interrupt sources. Acknowledging one of the tx_xmit interrupt sources also acknowledges the tx_msg interrupt.

Note: The reset value of this register’s bits is indeterminate.

Table 5-36. Interrupt Flags

BIT

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

OFFSET

46h

FIELD

_XMIT2TX

_XMIT1TX

_XMIT0TX

_CRCERR

FORMERR

_ACKERR

STUFERR

OVRLOAD

ARBLOSS

_MSGRX

_MSGTX

_BUSOFF

_ERRBIT

_OVRRX

///

RESET

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

−

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

			Table 5-37. Interrupt Flag Definitions

	Bits	Field Name		Description
	15	RX_MSG		Rx Message
				Depending on rx_level, at least one message is available.
	14	TX_MSG		Tx Message
				Depending on rx_level, at least one message is empty.
	13	TX_XMIT2		Tx Xmit 2
				Indicates that the message was successfully sent.
	12	TX_XMIT1		Tx Xmit 1
				Indicates that the message was successfully sent.
	11	TX_XMIT0		Tx Xmit 0
				Indicates that the message was successfully sent.
	10	BUS_OFF		Bus Off State
				CAN has reached the bus off state.
	9	CRC_ERR		CRC Error
				CRC error occurred while sending or receiving a message.
	8	FORM_ERR		Format Error
				Format error occurred while sending or receiving a
				message.
	7	ACK_ERR		Acknowledgement Error
				Acknowledgement error occurred while sending or receiving
				a message.
	6	STUF_ERR		Stuffing Error
				Stuffing error occurred while sending or receiving a
				message.
	5	BIT_ERR		Bit Error
				Bit error occurred while sending or receiving a message.
	4	RX_OVR		Receiver Overrun
				A new message arrived while the receive buffer is full. This
				Flag is set if either the incoming message overwrites an
				existing one or is discarded.
	3	OVR_LOAD		Overload Condition
				An overload condition has occurred.
	2	ARB_LOSS		Arbitration Loss
				Arbitration was lost while sending a message.
	1:0	///		Reserved

72

Image 80

Lantronix DSTni-EX Note The reset value of this register’s bits is indeterminate, 36. Interrupt Flags, Rx Message

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 RESETInterrupt Request Enable Phase SelectSPISTAT Register RESETTable 2-6. SPISTAT Register Table 2-7. SPISTAT Register DefinitionsSPISSEL Register Table 2-10. BCNT Bit SettingsRESET SelectO SignalDVDCNTRLO Register DVDCNTRHIRESET RESETFeatures 3 I2C ControllerBlock Diagram I2C BackgroundFigure 3-1. DSTni I2C Controller Block Diagram Theory of OperationMaster Transmit Mode I2C ControllerOperating Modes 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 CodeI 2C State Microprocessor ResponseServicing the Interrupt Table 3-5. Codes After Servicing Interrupt Master ReceiveSlave Transmit Mode Receiving Each Data ByteTable 3-6. Codes After Receiving Each Data Byte 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 RegisterRESET General Call Address EnableData 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 BitsField Name DescriptionTable 3-18. Clock Control Register Definitions Clock Control RegisterTable 3-17. Clock Control Register Software Reset Register Extended Slave Address RegisterTable 3-21. Software Reset Register Table 3-22. Software Reset Register Definitions4 USB Controller FeaturesUSB Background USB InterruptUSB Core Theory of OperationUSB 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 TransactionDedicated to host mode USB Register SummaryTable 4-7. USB Register Summary 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 ResetTable 4-11. 16- Error Interrupt Status Register Definitions Error RegisterTable 4-10. Error Interrupt Status Register 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 SignalStatus Register Table 4-12. Status RegisterUSB Reset Signal Host Mode Enable valid for host mode onlyResume Signaling BDT PDD ResetTable 4-15. 16- Address Register Definitions Address RegisterTable 4-14. Address Register Frame Number Registers RESETTable 4-16. Frame Number Register Table 4-17. Frame Number Register DefinitionsToken Register RESET Endpoint for Token CommandTable 4-18. Token Register Table 4-19. Token Register DefinitionsEndpoint 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 Data Exchanges and Communication Arbitration and Error CheckingCANBUS Background Table 5-1. Bit Rates for Different Cable Lengths CANBUS Speed and LengthFeatures CAN Register Summaries Register SummaryHex Offset RegisterHex Offset RegisterDetailed 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 DefinitionsReserved rxlevel10Interrupt 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 Message DataTable 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 ErrorcodeNote The reset value of this register’s bits is indeterminate Table 5-65. Error Capture Register DefinitionsFrame Reference Register Table 5-64. Frame Reference RegisterCAN 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