Mtclk Gmtclk | Texas Instruments TMS320C645x DSP manual

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EMAC Functional Architecture

2.3.3Gigabit Media Independent Interface (GMII) Connections

Figure 4 shows a device with integrated EMAC and MDIO interfaced via a GMII connection. This interface is available in 10 Mbps, 100 Mbps, and 1000 Mbps modes.

Figure 4. Ethernet Configuration with GMII Interface

System

core

EMAC

MDIO

MTCLK

GMTCLK

MTXD[7−0]

MTXEN

MCOL

MCRS

MRCLK

MRXD[7−0]

MRXDV

MRXER

MDCLK

MDIO

Physical layer device (PHY)

2.5MHz,

25 MHz,

or 125 MHz

Transformer

RJ−45

The GMII interface supports 10/100/1000 Mbps modes. Only full-duplex mode is available in 1000 Mbps mode. In 10/100 Mbps modes, the GMII interface acts like an MII interface, and only the lower 4 bits of data are transferred for each of the data buses.

20

Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)

SPRU975B –August 2006

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Texas Instruments TMS320C645x DSP manual Gigabit Media Independent Interface Gmii Connections, Mtclk Gmtclk

Contents

Users Guide Submit Documentation Feedback Contents Receive Unicast Clear Register Rxunicastclear Appendix a Appendix B List of Figures Transmit Pacing Algorithm Test Register Tpacetest List of Tables MAC Control Register Maccontrol Field Descriptions Read This First Features Purpose of the Peripheral Functional Block Diagram Emac and Mdio Block Diagram Industry Standards Compliance Statement Clock Control MII ClockingRmii Clocking Gmii Clocking Memory Map Rgmii Clocking Media Independent Interface MII Connections Interface Selection PinsSystem Level Connections Emac and Mdio Signals for MII Interface MtxenMrxdv Control Mrxer Mdclk Mdio Reduced Media Independent Interface Rmii ConnectionsMtxen Mcrsdv Mrefclk Emac and Mdio Signals for Rmii Interface Gigabit Media Independent Interface Gmii Connections Mtclk Gmtclk Emac and Mdio Signals for Gmii Interface Signal Name Description Rxctl Mdclk Mdio TXCTxctl Refclk RXC Emac and Mdio Signals for Rgmii Interface TXC Ethernet Frame Description Ethernet Protocol OverviewEthernet Frame Format Multiple Access Protocol Basic Descriptors Programming InterfacePacket Buffer Descriptors Typical Descriptor Linked List Transmit and Receive Descriptor Queues Transmit and Receive Emac Interrupts Transmit Buffer Descriptor Format Example 1. Transmit Descriptor in C Structure FormatSOP EOP Owner EOQ Tdown Pass Cmplt CRC Next Descriptor Pointer Buffer PointerBuffer Offset Buffer Length End of Packet EOP Flag Ownership Owner FlagEnd of Queue EOQ Flag Teardown Complete Tdowncmplt Flag Receive Buffer Descriptor Format Example 2. Receive Descriptor in C Structure Format Next Descriptor Pointer Jabber Flag Oversize Flag Code Error Codeerror Flag Alignment Error Alignerror FlagCRC Error Crcerror Flag Fragment Flag Emac Control Module Internal MemoryBus Arbiter CPU Mdio Module Components Management Data Input/Output Mdio ModuleInterrupt Control PHY Register User Access Mdio Clock GeneratorGlobal PHY Detection and Link State Monitoring Active PHY Monitoring Mdio Module Operational Overview Initializing the Mdio Module Reading Data From a PHY Register Example of Mdio Register Access CodeWriting Data to a PHY Register Example 3. Mdio Register Access Macros #define PHYREGreadregadr, phyadr Emac Module Emac Module ComponentsReceive DMA Engine Receive Fifo MAC Receiver Receive AddressTransmit DMA Engine Transmit Fifo Clock and Reset Logic Emac Module Operational Overview Media Independent Interfaces Data ReceptionReceive Control Receive Inter-Frame Interval Collision-Based Receive Buffer Flow Control Ieee 802.3X Based Receive Buffer Flow Control Transmit Control CRC InsertionAdaptive Performance Optimization APO Interpacket-Gap IPG Enforcement Transmit Flow Control Speed, Duplex, and Pause Frame Support Receive Channel Enabling Receive DMA Host ConfigurationPacket Receive Operation Receive Channel Addressing Hardware Receive QOS Support Receive Frame Classification Host Free Buffer TrackingReceive Channel Teardown Promiscuous Receive Mode Receive Frame Treatment Summary Receive Overrun Middle of Frame Overrun Treatment Transmit DMA Host Configuration Packet Transmit OperationReceive and Transmit Latency Transmit Channel Teardown Reset Considerations Software Reset ConsiderationsHardware Reset Considerations Transfer Node Priority Emac Control Module Initialization InitializationEnabling the EMAC/MDIO Peripheral Example 5. Mdio Module Initialization Code Example 4. Emac Control Module Initialization CodeMdio Module Initialization Emac Module Initialization Transmit Packet Completion Interrupts Interrupt SupportEmac Module Interrupt Events and Requests Receive Packet Completion Interrupts Statistics Interrupt Host Error Interrupt User Access Completion InterruptMdio Module Interrupt Events and Requests Link Change Interrupt Power Management Emulation ConsiderationsProper Interrupt Processing Interrupt Multiplexing Emac Control Module Registers IntroductionEmac Control Module Interrupt Control Register Ewctl Ewint Tcnt Management Data Input/Output Mdio Registers Mdio Version Register Version Mdio Version Register Version Field DescriptionsModid Revmaj Revmin Modid Mdio Control Register Control Mdio Control Register Control Field Descriptions PHY Acknowledge Status Register Alive PHY Acknowledge Status Register Alive Field Descriptions PHY Link Status Register Link PHY Link Status Register Link Field Descriptions 31-2 Linkint Masked Userintraw Will clear the interrupt and writing 0 has no effect Maskset Userintmask Clear Mdio User Access Register 0 USERACCESS0 Mdio User Access Register 0 USERACCESS0 Field Descriptions Mdio User PHY Select Register 0 USERPHYSEL0 Linksel LinkintenbPhyadrmon Linksel Mdio User Access Register 1 USERACCESS1 Mdio User Access Register 1 USERACCESS1 Field Descriptions Mdio User PHY Select Register 1 USERPHYSEL1 Mdio User PHY Select Register 1 USERPHYSEL1 Ethernet Media Access Controller Emac Registers Macconfig SoftresetRX7FREEBUFFER Maccontrol Rxcrcerrors RxaligncodeerrorsTX6CP TX7CP FRAME1024TUP NetoctetsRxsofoverruns Rxmofoverruns Txident Transmit Identification and Version Register TxidverTxident Txmajorver Txminorver Txen Transmit Control Register TxcontrolTransmit Control Register Txcontrol Field Descriptions Txtdnch Transmit Teardown Register TxteardownTransmit Teardown Register Txteardown Field Descriptions Rxident Receive Identification and Version Register RxidverRxident Rxmajorver Rxminorver Rxen Receive Control Register RxcontrolReceive Control Register Rxcontrol Field Descriptions Rxtdnch Receive Teardown Register RxteardownReceive Teardown Register Rxteardown Field Descriptions Transmit Interrupt Status Unmasked Register Txintstatraw Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Mask Set Register Txintmaskset Transmit Interrupt Mask Clear Register Txintmaskclear Transmit Interrupt Mask Clear Register Txintmaskclear MAC Input Vector Register Macinvector MAC Input Vector Register Macinvector Field Descriptions Receive Interrupt Status Unmasked Register Rxintstatraw Receive Interrupt Status Masked Register Rxintstatmasked Receive Interrupt Status Masked Register Rxintstatmasked Receive Interrupt Mask Set Register Rxintmaskset Receive Interrupt Mask Clear Register Rxintmaskclear Receive Interrupt Mask Clear Register Rxintmaskclear MAC Interrupt Status Unmasked Register Macintstatraw Host Stat Pend MAC Interrupt Status Masked Register Macintstatmasked MAC Interrupt Status Masked Register Macintstatmasked MAC Interrupt Mask Set Register Macintmaskset Host Stat MaskHostmask Statmask MAC Interrupt Mask Clear Register Macintmaskclear MAC Interrupt Mask Clear Register Macintmaskclear Rxpasscrc Rxqosen Rxnochain RxcmfenRxcsfen Rxcefen Rxcafen Rxpromch Rxmulten RxbroadenRxbroadch Receive Unicast Enable Set Register Rxunicastset RxmultchRXCH6EN RXCH5EN RXCH4EN RXCH3EN RXCH2EN RXCH1EN RXCH0EN RXCH7EN Receive Unicast Clear Register Rxunicastclear Receive Unicast Clear Register Rxunicastclear Receive Maximum Length Register Rxmaxlen Receive Maximum Length Register Rxmaxlen Field Descriptions Offset Receive Buffer Offset Register RxbufferoffsetRxbuffer Rxfilterthresh Reserved RX nFLOW Thresh Receive Channel 0-7 Free Buffer Count Register RXnFREEBUFFER MAC Control Register Maccontrol MAC Control Register Maccontrol Field Descriptions Cmdidle TxptypeGIG Txpace MAC Status Register Macstatus MAC Status Register Macstatus Field DescriptionsTxerrcode Txerrch Rxerrcode RxerrchRgmiigig Rgmiifull Emulation Control Register Emcontrol Emulation Control Register Emcontrol Field DescriptionsSoft Free Soft Fifo Control Register Fifocontrol Fifo Control Register Fifocontrol Field DescriptionsRxfifoflowthresh Txcellthresh MAC Configuration Register Macconfig MAC Configuration Register Macconfig Field DescriptionsTxcelldepth Rxcelldepth Addresstype Maccfig Txcelldepth Soft Reset Register Softreset Soft Reset Register Softreset Field Descriptions MACSRCADDR0 MAC Source Address Low Bytes Register MacsrcaddrloMACSRCADDR0 MACSRCADDR1 MACSRCADDR2 MAC Source Address High Bytes Register MacsrcaddrhiMACSRCADDR2 MACSRCADDR3 MACSRCADDR4 MACSRCADDR5 MAC Hash Address Register 1 MACHASH1 MAC Hash Address Register 1 MACHASH1 Field Descriptions MAC Hash Address Register 2 MACHASH2 MAC Hash Address Register 2 MACHASH2 Field Descriptions Back Off Test Register Bofftest Back Off Test Register Bofftest Field DescriptionsRndnum Collcount Transmit Pacing Algorithm Test Register Tpacetest Paceval Pausetimer Receive Pause Timer Register RxpauseReceive Pause Timer Register Rxpause Field Descriptions Transmit Pause Timer Register Txpause Transmit Pause Timer Register Txpause Field Descriptions MAC Address Low Bytes Register Macaddrlo MAC Address Low Bytes Register Macaddrlo Field DescriptionsValid Match Channel Filt MACADDR0 MACADDR1 Valid MACADDR2 MAC Address High Bytes Register MacaddrhiMACADDR2 MACADDR3 MACADDR4 MACADDR5 MAC Index Register Macindex MAC Index Register Macindex Field Descriptions TX nHDP RX nHDP Transmit Channel 0-7 Completion Pointer Register TXnCP Transmit Channel n Completion Pointer Register TX nCP Receive Channel 0-7 Completion Pointer Register RXnCP Receive Channel n Completion Pointer Register RX nCP Network Statistics Registers Statistics Register Field DescriptionsGood Receive Frames Register Rxgoodframes Broadcast Receive Frames Register Rxbcastframes Receive CRC Errors Register Rxcrcerrors Receive Alignment/Code Errors Register RxaligncodeerrorsMulticast Receive Frames Register Rxmcastframes Pause Receive Frames Register Rxpauseframes Receive Oversized Frames Register Rxoversized Receive Jabber Frames Register RxjabberReceive Undersized Frames Register Rxundersized Receive Frame Fragments Register Rxfragments Filtered Receive Frames Register Rxfiltered Receive QOS Filtered Frames Register RxqosfilteredReceive Octet Frames Register Rxoctets Good Transmit Frames Register Txgoodframes Broadcast Transmit Frames Register Txbcastframes Multicast Transmit Frames Register TxmcastframesPause Transmit Frames Register Txpauseframes Deferred Transmit Frames Register Txdeferred Transmit Underrun Error Register Txunderrun Transmit Single Collision Frames Register TxsinglecollTransmit Multiple Collision Frames Register Txmulticoll Transmit Late Collision Frames Register Txlatecoll Transmit and Receive 64 Octet Frames Register FRAME64 Transmit Carrier Sense Errors Register TxcarriersenseTransmit Octet Frames Register Txoctets Network Octet Frames Register Netoctets 144 Appendix a Glossary Table A-1. Physical Layer Definitions Term Definition Appendix B Revision History Table B-1. Document Revision History Important Notice