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Texas Instruments TMS320C674X Receive Channel n Free Buffer Count Register RXnFREEBUFFER, Field

Models: TMS320C674X

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Figure 66. Receive Channel n Free Buffer Count Register (RXnFREEBUFFER)

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EMAC Module Registers

5.28 Receive Channel Free Buffer Count Registers (RX0FREEBUFFER-RX7FREEBUFFER)

The receive channel 0-7 free buffer count register (RXnFREEBUFFER) is shown in Figure 66 and described in Table 65.

	Figure 66. Receive Channel n Free Buffer Count Register (RXnFREEBUFFER)
31			16

			Reserved

			R-0
15			0

			RXnFREEBUF

			WI-0
LEGEND: R = Read only; WI = Write to increment; -n= value after reset
	Table 65. Receive Channel n Free Buffer Count Register (RXnFREEBUFFER) Field Descriptions

Bit	Field	Value	Description

31-16	Reserved	0	Reserved

15-0	RXnFREEBUF	0-FFh	Receive free buffer count. These bits contain the count of free buffers available. The
			RXFILTERTHRESH value is compared with this field to determine if low priority frames should be
			filtered. The RXnFLOWTHRESH value is compared with this field to determine if receive flow
			control should be issued against incoming packets (if enabled). This is a write-to-increment field.
			This field rolls over to 0 on overflow.
			If hardware flow control or QOS is used, the host must initialize this field to the number of available
			buffers (one register per channel). The EMAC decrements the associated channel register for each
			received frame by the number of buffers in the received frame. The host must write this field with
			the number of buffers that have been freed due to host processing.

SPRUFL5B –April 2011	EMAC/MDIO Module	109
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Texas Instruments TMS320C674X Receive Channel n Free Buffer Count Register RXnFREEBUFFER, EMAC Module Registers, Field

Contents

Users Guide TMS320C674x/OMAP-L1x Processor Ethernet Media Access Controller EMACManagement Data Input/Output MDIO Module Submit Documentation Feedback SPRUFL5B -AprilPreface C0TXIMAX-C2TXIMAX Emulation Control Register EMCONTROL List of Figures Transmit Interrupt Mask Set Register TXINTMASKSET List of Tables List of TablesTransmit Interrupt Mask Set Register TXINTMASKSET Field Descriptions Preface Read This FirstAbout This Manual Notational ConventionsRead This First Related Documentation From Texas InstrumentsUsers Guide EMAC/MDIO Module1.2 Features 1 IntroductionFigure 1. EMAC and MDIO Block Diagram 1.3 Functional Block Diagram1.4 Industry Standards Compliance Statement 2.3 Signal Descriptions2 Architecture 2.1 Clock ControlTable 1. EMAC and MDIO Signals for MII Interface Figure 2. Ethernet Configuration-MII ConnectionsSignal TypeFigure 3. Ethernet Configuration-RMII Connections Table 1. EMAC and MDIO Signals for MII Interface continuedTable 2. EMAC and MDIO Signals for RMII Interface 2.3.2 Reduced Media Independent Interface RMII Connections2.4.1 Ethernet Frame Format 2.4 Ethernet Protocol OverviewFigure 4. Ethernet Frame Format Table 3. Ethernet Frame Description2.5 Programming Interface 2.4.2 Ethernet’s Multiple Access Protocol2.5.1 Packet Buffer Descriptors Figure 5. Basic Descriptor FormatFigure 6. Typical Descriptor Linked List Table 4. Basic Descriptor DescriptionWord Offset 2.5.2 Transmit and Receive Descriptor Queues 2.5.4 Transmit Buffer Descriptor Format 2.5.3 Transmit and Receive EMAC InterruptsExample 1. Transmit Buffer Descriptor in C Structure Format Figure 7. Transmit Buffer Descriptor FormatNext Descriptor Pointer Buffer Pointer2.5.4.2 Buffer Pointer 2.5.4.1 Next Descriptor Pointer2.5.4.3 Buffer Offset 2.5.4.4 Buffer Length2.5.4.8 Ownership OWNER Flag 2.5.4.7 End of Packet EOP Flag2.5.4.9 End of Queue EOQ Flag 2.5.4.10 Teardown Complete TDOWNCMPLT Flag2.5.5.1 Next Descriptor Pointer 2.5.5 Receive Buffer Descriptor Format2.5.5.2 Buffer Pointer Figure 8. Receive Buffer Descriptor Format2.5.5.3 Buffer Offset Example 2. Receive Buffer Descriptor in C Structure Format2.5.5.5 Packet Length 2.5.5.4 Buffer Length2.5.5.6 Start of Packet SOP Flag 2.5.5.7 End of Packet EOP Flag2.5.5.19 Alignment Error ALIGNERROR Flag 2.5.5.18 Code Error CODEERROR Flag2.5.5.20 CRC Error CRCERROR Flag 2.5.5.11 Pass CRC PASSCRC Flag2.6 EMAC Control Module Figure 9. EMAC Control Module Block Diagram2.6.1 Internal Memory 2.6.2 Bus Arbiter2.6.3 Interrupt Control 2.7 MDIO Module2.7.1 MDIO Module Components 2.7.1.4 PHY Register User Access Figure 10. MDIO Module Block Diagram2.7.1.1 MDIO Clock Generator 2.7.1.2 Global PHY Detection and Link State Monitoring2.7.2 MDIO Module Operational Overview 2.7.2.2 Writing Data To a PHY Register 2.7.2.1 Initializing the MDIO Module2.7.2.3 Reading Data From a PHY Register Example 3. MDIO Register Access Macros 2.7.2.4 Example of MDIO Register Access Code#define PHYREGreadregadr, phyadr #define PHYREGwriteregadr, phyadr, data2.8 EMAC Module Figure 11. EMAC Module Block Diagram2.8.1 EMAC Module Components 2.8.1.1 Receive DMA Engine2.8.1.4 Transmit DMA Engine 2.8.1.11 Clock and Reset Logic2.8.1.5 Transmit FIFO 2.8.1.6 MAC Transmitter2.9.1 Data Reception 2.9 MAC Interface2.9.1.1 Receive Control 2.9.1.2 Receive Inter-Frame Interval2.9.1.3.2 IEEE 802.3x-Based Receive Buffer Flow Control 2.9.1.3.1 Collision-Based Receive Buffer Flow Control2.9.2.1 Transmit Control 2.9.2 Data Transmission2.9.2.2 CRC Insertion 2.9.2.3 Adaptive Performance Optimization APO2.9.2.7 Speed, Duplex, and Pause Frame Support 2.9.2.6 Transmit Flow Control2.10 Packet Receive Operation 2.10.1 Receive DMA Host Configuration2.10.2 Receive Channel Enabling 2.10.3 Receive Address Matching2.10.5 Host Free Buffer Tracking 2.10.4 Hardware Receive QOS Support2.10.6 Receive Channel Teardown 2.10.8 Promiscuous Receive Mode 2.10.7 Receive Frame ClassificationRXCAFEN Table 5. Receive Frame Treatment SummaryRXCEFEN RXCMFENTable 6. Middle of Frame Overrun Treatment 2.10.9 Receive Overrun2.11 Packet Transmit Operation 2.11.1 Transmit DMA Host Configuration2.11.2 Transmit Channel Teardown 2.13 Transfer Node Priority 2.12 Receive and Transmit Latency2.14.1 Software Reset Considerations 2.14 Reset Considerations2.14.2 Hardware Reset Considerations 2.15.1 Enabling the EMAC/MDIO Peripheral 2.15 Initialization2.15.2 EMAC Control Module Initialization 2.15.3 MDIO Module Initialization2.15.4 EMAC Module Initialization 2.16.1 EMAC Module Interrupt Events and Requests 2.16 Interrupt Support2.16.1.1 Transmit Packet Completion Interrupts 2.16.1.2 Receive Packet Completion Interrupts2.16.1.3 Statistics Interrupt 2.16.1.4 Host Error Interrupt2.16.2 MDIO Module Interrupt Events and Requests 2.16.1.5 Receive Threshold Interrupts2.16.2.1 Link Change Interrupt 2.16.3 Proper Interrupt Processing 2.16.2.2 User Access Completion Interrupt2.16.4 Interrupt Multiplexing 2.18 Emulation Considerations 2.17 Power ManagementTable 7. Emulation Control Table 8. EMAC Control Module Registers 3 EMAC Control Module RegistersEMAC Control Module Registers AcronymTable 8. EMAC Control Module Registers continued 3.1 EMAC Control Module Revision ID Register REVIDFigure 12. EMAC Control Module Revision ID Register REVID OffsetFigure 13. EMAC Control Module Software Reset Register SOFTRESET 3.2 EMAC Control Module Software Reset Register SOFTRESETTable 10. EMAC Control Module Software Reset Register SOFTRESET EMAC Control Module RegistersFigure 14. EMAC Control Module Interrupt Control Register INTCONTROL 3.3 EMAC Control Module Interrupt Control Register INTCONTROLTable 11. EMAC Control Module Interrupt Control Register INTCONTROL FieldCnRXTHRESHEN C0RXTHRESHEN-C2RXTHRESHENCnRXTHRESHEN EMAC Control Module RegistersPage Page CnMISCEN CnMISCENField ValueCnRXTHRESHSTAT C0RXTHRESHSTAT-C2RXTHRESHSTATCnRXTHRESHSTAT EMAC Control Module RegistersPage Page CnMISCSTAT CnMISCSTATField ValueCnRXIMAX CnRXIMAXEMAC Control Module Registers FieldCnTXIMAX CnTXIMAXField Value4.1 MDIO Revision ID Register REVID 4 MDIO RegistersTable 22. Management Data Input/Output MDIO Registers Figure 25. MDIO Revision ID Register REVIDFigure 26. MDIO Control Register CONTROL 4.2 MDIO Control Register CONTROLTable 24. MDIO Control Register CONTROL Field Descriptions MDIO Registers4.4 PHY Link Status Register LINK 4.3 PHY Acknowledge Status Register ALIVEFigure 27. PHY Acknowledge Status Register ALIVE Table 25. PHY Acknowledge Status Register ALIVE Field DescriptionsField Descriptions 4.5 MDIO Link Status Change Interrupt Unmasked Register LINKINTRAWField Descriptions 4.6 MDIO Link Status Change Interrupt Masked Register LINKINTMASKEDField Descriptions 4.7 MDIO User Command Complete Interrupt Unmasked Register USERINTRAWField Descriptions Field Descriptions USERINTMASKCLEAR 4.10 MDIO User Command Complete Interrupt Mask Clear RegisterField Descriptions Figure 35. MDIO User Access Register 0 USERACCESS0 4.11 MDIO User Access Register 0 USERACCESS0Table 33. MDIO User Access Register 0 USERACCESS0 Field Descriptions MDIO RegistersFigure 36. MDIO User PHY Select Register 0 USERPHYSEL0 4.12 MDIO User PHY Select Register 0 USERPHYSEL0MDIO Registers FieldFigure 37. MDIO User Access Register 1 USERACCESS1 4.13 MDIO User Access Register 1 USERACCESS1Table 35. MDIO User Access Register 1 USERACCESS1 Field Descriptions MDIO RegistersFigure 38. MDIO User PHY Select Register 1 USERPHYSEL1 4.14 MDIO User PHY Select Register 1 USERPHYSEL1MDIO Registers Field5 EMAC Module Registers Table 37. Ethernet Media Access Controller EMAC RegistersEMAC Module Registers AcronymOffset Table 37. Ethernet Media Access Controller EMAC Registers continuedAcronym Register DescriptionOffset Table 37. Ethernet Media Access Controller EMAC Registers continuedAcronym Register Description5.2 Transmit Control Register TXCONTROL 5.1 Transmit Revision ID Register TXREVIDFigure 39. Transmit Revision ID Register TXREVID Table 38. Transmit Revision ID Register TXREVID Field DescriptionsFigure 41. Transmit Teardown Register TXTEARDOWN 5.3 Transmit Teardown Register TXTEARDOWNTable 40. Transmit Teardown Register TXTEARDOWN Field Descriptions EMAC Module Registers5.5 Receive Control Register RXCONTROL 5.4 Receive Revision ID Register RXREVIDFigure 42. Receive Revision ID Register RXREVID Table 41. Receive Revision ID Register RXREVID Field DescriptionsFigure 44. Receive Teardown Register RXTEARDOWN 5.6 Receive Teardown Register RXTEARDOWNTable 43. Receive Teardown Register RXTEARDOWN Field Descriptions EMAC Module RegistersFigure 45. Transmit Interrupt Status Unmasked Register TXINTSTATRAW 5.7 Transmit Interrupt Status Unmasked Register TXINTSTATRAWEMAC Module Registers FieldFigure 46. Transmit Interrupt Status Masked Register TXINTSTATMASKED 5.8 Transmit Interrupt Status Masked Register TXINTSTATMASKEDEMAC Module Registers FieldFigure 47. Transmit Interrupt Mask Set Register TXINTMASKSET 5.9 Transmit Interrupt Mask Set Register TXINTMASKSETEMAC Module Registers FieldFigure 48. Transmit Interrupt Mask Clear Register TXINTMASKCLEAR 5.10 Transmit Interrupt Mask Clear Register TXINTMASKCLEAREMAC Module Registers FieldFigure 49. MAC Input Vector Register MACINVECTOR 5.11 MAC Input Vector Register MACINVECTORTable 48. MAC Input Vector Register MACINVECTOR Field Descriptions EMAC Module RegistersFigure 50. MAC End Of Interrupt Vector Register MACEOIVECTOR 5.12 MAC End Of Interrupt Vector Register MACEOIVECTOREMAC Module Registers FieldFigure 51. Receive Interrupt Status Unmasked Register RXINTSTATRAW 5.13 Receive Interrupt Status Unmasked Register RXINTSTATRAWEMAC Module Registers FieldFigure 52. Receive Interrupt Status Masked Register RXINTSTATMASKED 5.14 Receive Interrupt Status Masked Register RXINTSTATMASKEDEMAC Module Registers FieldFigure 53. Receive Interrupt Mask Set Register RXINTMASKSET 5.15 Receive Interrupt Mask Set Register RXINTMASKSETEMAC Module Registers FieldFigure 54. Receive Interrupt Mask Clear Register RXINTMASKCLEAR 5.16 Receive Interrupt Mask Clear Register RXINTMASKCLEAREMAC Module Registers Field5.18 MAC Interrupt Status Masked Register MACINTSTATMASKED 5.17 MAC Interrupt Status Unmasked Register MACINTSTATRAWFigure 55. MAC Interrupt Status Unmasked Register MACINTSTATRAW Figure 56. MAC Interrupt Status Masked Register MACINTSTATMASKED5.20 MAC Interrupt Mask Clear Register MACINTMASKCLEAR 5.19 MAC Interrupt Mask Set Register MACINTMASKSETFigure 57. MAC Interrupt Mask Set Register MACINTMASKSET Figure 58. MAC Interrupt Mask Clear Register MACINTMASKCLEARRXMBPENABLE 5.21 Receive Multicast/Broadcast/Promiscuous Channel Enable RegisterField Descriptions Field Field Descriptions continuedValue DescriptionField Field Descriptions continuedValue DescriptionFigure 60. Receive Unicast Enable Set Register RXUNICASTSET 5.22 Receive Unicast Enable Set Register RXUNICASTSETEMAC Module Registers FieldFigure 61. Receive Unicast Clear Register RXUNICASTCLEAR 5.23 Receive Unicast Clear Register RXUNICASTCLEAREMAC Module Registers Field5.25 Receive Buffer Offset Register RXBUFFEROFFSET 5.24 Receive Maximum Length Register RXMAXLENFigure 62. Receive Maximum Length Register RXMAXLEN Table 61. Receive Maximum Length Register RXMAXLEN Field DescriptionsRX0FLOWTHRESH-RX7FLOWTHRESH 5.27 Receive Channel Flow Control Threshold RegistersField Descriptions Field DescriptionsEMAC Module Registers Figure 66. Receive Channel n Free Buffer Count Register RXnFREEBUFFERField DescriptionFigure 67. MAC Control Register MACCONTROL 5.29 MAC Control Register MACCONTROLTable 66. MAC Control Register MACCONTROL Field Descriptions EMAC Module RegistersValue FieldDescription Submit Documentation FeedbackFigure 68. MAC Status Register MACSTATUS 5.30 MAC Status Register MACSTATUSTable 67. MAC Status Register MACSTATUS Field Descriptions EMAC Module RegistersField Table 67. MAC Status Register MACSTATUS Field Descriptions continuedValue Description5.32 FIFO Control Register FIFOCONTROL 5.31 Emulation Control Register EMCONTROLFigure 69. Emulation Control Register EMCONTROL Table 68. Emulation Control Register EMCONTROL Field Descriptions5.34 Soft Reset Register SOFTRESET 5.33 MAC Configuration Register MACCONFIGFigure 71. MAC Configuration Register MACCONFIG Table 70. MAC Configuration Register MACCONFIG Field Descriptions5.36 MAC Source Address High Bytes Register MACSRCADDRHI 5.35 MAC Source Address Low Bytes Register MACSRCADDRLOFigure 73. MAC Source Address Low Bytes Register MACSRCADDRLO Figure 74. MAC Source Address High Bytes Register MACSRCADDRHI5.38 MAC Hash Address Register 2 MACHASH2 5.37 MAC Hash Address Register 1 MACHASH1Figure 75. MAC Hash Address Register 1 MACHASH1 Table 74. MAC Hash Address Register 1 MACHASH1 Field Descriptions5.40 Transmit Pacing Algorithm Test Register TPACETEST 5.39 Back Off Test Register BOFFTESTFigure 77. Back Off Random Number Generator Test Register BOFFTEST Table 76. Back Off Test Register BOFFTEST Field Descriptions5.42 Transmit Pause Timer Register TXPAUSE 5.41 Receive Pause Timer Register RXPAUSEFigure 79. Receive Pause Timer Register RXPAUSE Table 78. Receive Pause Timer Register RXPAUSE Field DescriptionsFigure 81. MAC Address Low Bytes Register MACADDRLO 5.43 MAC Address Low Bytes Register MACADDRLOTable 80. MAC Address Low Bytes Register MACADDRLO Field Descriptions EMAC Module Registers5.45 MAC Index Register MACINDEX 5.44 MAC Address High Bytes Register MACADDRHIFigure 82. MAC Address High Bytes Register MACADDRHI Figure 83. MAC Index Register MACINDEX5.46 Transmit Channel DMA Head Descriptor Pointer Registers TX0HDP-TX7HDP 5.49 Receive Channel Completion Pointer Registers RX0CP-RX7CP 5.48 Transmit Channel Completion Pointer Registers TX0CP-TX7CPFigure 86. Transmit Channel n Completion Pointer Register TXnCP Figure 87. Receive Channel n Completion Pointer Register RXnCPFigure 88. Statistics Register 5.50 Network Statistics Registers5.50.1 Good Receive Frames Register RXGOODFRAMES 5.50.2 Broadcast Receive Frames Register RXBCASTFRAMES5.50.6 Receive Alignment/Code Errors Register RXALIGNCODEERRORS 5.50.5 Receive CRC Errors Register RXCRCERRORS5.50.4 Pause Receive Frames Register RXPAUSEFRAMES 5.50.8 Receive Jabber Frames Register RXJABBER 5.50.7 Receive Oversized Frames Register RXOVERSIZED5.50.9 Receive Undersized Frames Register RXUNDERSIZED 5.50.10 Receive Frame Fragments Register RXFRAGMENTS5.50.13 Receive Octet Frames Register RXOCTETS 5.50.12 Receive QOS Filtered Frames Register RXQOSFILTERED5.50.14 Good Transmit Frames Register TXGOODFRAMES 5.50.16 Multicast Transmit Frames Register TXMCASTFRAMES 5.50.15 Broadcast Transmit Frames Register TXBCASTFRAMES5.50.17 Pause Transmit Frames Register TXPAUSEFRAMES 5.50.18 Deferred Transmit Frames Register TXDEFERRED5.50.20 Transmit Single Collision Frames Register TXSINGLECOLL 5.50.24 Transmit Underrun Error Register TXUNDERRUN5.50.21 Transmit Multiple Collision Frames Register TXMULTICOLL 5.50.22 Transmit Excessive Collision Frames Register TXEXCESSIVECOLL5.50.26 Transmit Octet Frames Register TXOCTETS 5.50.25 Transmit Carrier Sense Errors Register TXCARRIERSENSE5.50.27 Transmit and Receive 64 Octet Frames Register FRAME64 5.50.33 Network Octet Frames Register NETOCTETS 5.50.36 Receive DMA Overruns Register RXDMAOVERRUNS Appendix A Glossary Table 87. Physical Layer Definitions Table 88. Document Revision History Appendix B Revision HistoryReference Additions/Modifications/Deletions Submit Documentation FeedbackProducts IMPORTANT NOTICEApplications TI E2E Community Home Page