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Texas Instruments TMS320C645x DSP manual Functional Block Diagram, Emac and Mdio Block Diagram

Models: TMS320C645x DSP

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Introduction

1.3Functional Block Diagram

Figure 1 shows the three main functional modules of the EMAC/MDIO peripheral:

∙EMAC control module

∙EMAC module

∙MDIO module

The EMAC control module is the main interface between the device core processor and the EMAC module and MDIO module. The EMAC control module contains the necessary components to allow the EMAC to make efficient use of device memory, plus it controls device interrupts. The EMAC control module incorporates 8K byte internal RAM to hold EMAC buffer descriptors.

The management data input / output (MDIO) module implements the 802.3 serial management interface to interrogate and control up to 32 ethernet PHY(s) connected to the device, using a shared two–wire bus. Application software uses the MDIO module to configure the auto-negotiation parameters of each PHY attached to the EMAC, retrieve the negotiation results, and configure required parameters in the EMAC module for correct operation. The module is designed to allow almost transparent operation of the MDIO interface, with very little maintenance from the core processor.

The ethernet media access controller (EMAC) module provides an efficient interface between the C645x core processor and the networked community. The EMAC supports 10Base-T (10 Mbits / sec), and 100BaseTX (100 Mbits / sec), in either half or full duplex mode, and 1000BaseT (1000 Mbits / sec) in full duplex mode, with hardware flow control and quality-of-service (QOS) support.

Figure 1. EMAC and MDIO Block Diagram

	Interrupt	Configuration bus			DMA memory
	controller	Configuration bus		transfer controller
	controller			transfer controller
			Peripheral bus
	EMAC/MDIO	EMAC control module
	EMAC/MDIO
	interrupt	EMAC module			MDIO module
		EMAC module			MDIO module

MII RMII GMII RGMII

MDIO bus

Figure 1 also shows the main interface between the EMAC control module and the CPU.

The following connections are made to the device core:

∙The peripheral bus connection from the EMAC control module allows the EMAC module to read and write both internal and external memory through the switch fabric interface.

∙The EMAC control, EMAC, and MDIO modules all have control registers. These registers are memory-mapped into device memory space via the device configuration bus. The control module’s internal RAM maps to this same range along with these registers.

∙The EMAC and MDIO interrupts are combined into a single interrupt within the control module. The interrupt from the control module then goes to the device’s interrupt controller.

The EMAC and MDIO interrupts are combined within the control module, so only the control module interrupt needs to be monitored by the application software or device driver. The interrupt is mapped to a specific CPU interrupt via the enhanced interrupt selector within the C64x+ core. The combined EMAC / MDIO interrupt maps to the interrupt controller input as system event 17.

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

SPRU975B –August 2006

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Texas Instruments TMS320C645x DSP manual Functional Block Diagram, Emac and Mdio Block Diagram

Contents

Users Guide Submit Documentation Feedback Contents Receive Unicast Clear Register Rxunicastclear Appendix a Appendix BList of Figures Transmit Pacing Algorithm Test Register Tpacetest List of Tables MAC Control Register Maccontrol Field Descriptions Read This First Features Purpose of the PeripheralFunctional Block Diagram Emac and Mdio Block DiagramIndustry Standards Compliance Statement Clock Control MII ClockingRmii Clocking Gmii ClockingMemory Map Rgmii ClockingInterface Selection Pins System Level ConnectionsMedia Independent Interface MII Connections Emac and Mdio Signals for MII Interface MtxenMrxdv ControlReduced Media Independent Interface Rmii Connections Mtxen Mcrsdv MrefclkMrxer Mdclk Mdio Emac and Mdio Signals for Rmii Interface Gigabit Media Independent Interface Gmii Connections Mtclk GmtclkEmac and Mdio Signals for Gmii Interface Signal Name DescriptionTXC Txctl Refclk RXCRxctl Mdclk Mdio Emac and Mdio Signals for Rgmii Interface TXCEthernet Protocol Overview Ethernet Frame FormatEthernet Frame Description Multiple Access Protocol Programming Interface Packet Buffer DescriptorsBasic 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 CRCNext Descriptor Pointer Buffer PointerBuffer Offset Buffer LengthEnd of Packet EOP Flag Ownership Owner FlagEnd of Queue EOQ Flag Teardown Complete Tdowncmplt FlagReceive Buffer Descriptor Format Example 2. Receive Descriptor in C Structure FormatNext Descriptor Pointer Jabber Flag Oversize FlagCode Error Codeerror Flag Alignment Error Alignerror FlagCRC Error Crcerror Flag Fragment FlagEmac Control Module Internal MemoryBus Arbiter CPUManagement Data Input/Output Mdio Module Interrupt ControlMdio Module Components PHY Register User Access Mdio Clock GeneratorGlobal PHY Detection and Link State Monitoring Active PHY MonitoringMdio Module Operational Overview Initializing the Mdio ModuleExample of Mdio Register Access Code Writing Data to a PHY RegisterReading Data From a PHY Register Example 3. Mdio Register Access Macros #define PHYREGreadregadr, phyadrEmac Module Emac Module ComponentsReceive DMA Engine Receive FifoMAC Receiver Receive AddressTransmit DMA Engine Transmit FifoClock and Reset Logic Emac Module Operational OverviewMedia Independent Interfaces Data ReceptionReceive Control Receive Inter-Frame IntervalCollision-Based Receive Buffer Flow Control Ieee 802.3X Based Receive Buffer Flow ControlTransmit Control CRC InsertionAdaptive Performance Optimization APO Interpacket-Gap IPG EnforcementTransmit Flow Control Speed, Duplex, and Pause Frame SupportReceive DMA Host Configuration Packet Receive OperationReceive Channel Enabling Receive Channel Addressing Hardware Receive QOS SupportHost Free Buffer Tracking Receive Channel TeardownReceive Frame Classification Promiscuous Receive Mode Receive Frame Treatment SummaryReceive Overrun Middle of Frame Overrun TreatmentTransmit DMA Host Configuration Packet Transmit OperationReceive and Transmit Latency Transmit Channel TeardownReset Considerations Software Reset ConsiderationsHardware Reset Considerations Transfer Node PriorityInitialization Enabling the EMAC/MDIO PeripheralEmac Control Module Initialization Example 4. Emac Control Module Initialization Code Mdio Module InitializationExample 5. Mdio Module Initialization Code Emac Module Initialization Interrupt Support Emac Module Interrupt Events and RequestsTransmit Packet Completion Interrupts Receive Packet Completion Interrupts Statistics InterruptHost Error Interrupt User Access Completion InterruptMdio Module Interrupt Events and Requests Link Change InterruptPower Management Emulation ConsiderationsProper Interrupt Processing Interrupt MultiplexingIntroduction Emac Control Module Interrupt Control Register EwctlEmac Control Module Registers Ewint TcntManagement Data Input/Output Mdio Registers Mdio Version Register Version Mdio Version Register Version Field DescriptionsModid Revmaj Revmin ModidMdio Control Register Control Mdio Control Register Control Field DescriptionsPHY Acknowledge Status Register Alive PHY Acknowledge Status Register Alive Field DescriptionsPHY Link Status Register Link PHY Link Status Register Link Field Descriptions31-2 Linkint Masked Userintraw Will clear the interrupt and writing 0 has no effect Maskset Userintmask ClearMdio User Access Register 0 USERACCESS0 Mdio User Access Register 0 USERACCESS0 Field DescriptionsMdio User PHY Select Register 0 USERPHYSEL0 Linksel LinkintenbPhyadrmon LinkselMdio User Access Register 1 USERACCESS1 Mdio User Access Register 1 USERACCESS1 Field DescriptionsMdio User PHY Select Register 1 USERPHYSEL1 Mdio User PHY Select Register 1 USERPHYSEL1Ethernet Media Access Controller Emac Registers Macconfig SoftresetRX7FREEBUFFER MaccontrolRxcrcerrors RxaligncodeerrorsTX6CP TX7CPFRAME1024TUP NetoctetsRxsofoverruns RxmofoverrunsTransmit Identification and Version Register Txidver Txident Txmajorver TxminorverTxident Transmit Control Register Txcontrol Transmit Control Register Txcontrol Field DescriptionsTxen Transmit Teardown Register Txteardown Transmit Teardown Register Txteardown Field DescriptionsTxtdnch Receive Identification and Version Register Rxidver Rxident Rxmajorver RxminorverRxident Receive Control Register Rxcontrol Receive Control Register Rxcontrol Field DescriptionsRxen Receive Teardown Register Rxteardown Receive Teardown Register Rxteardown Field DescriptionsRxtdnch Transmit Interrupt Status Unmasked Register Txintstatraw Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Status Masked Register TxintstatmaskedTransmit Interrupt Mask Set Register Txintmaskset Transmit Interrupt Mask Clear Register Txintmaskclear Transmit Interrupt Mask Clear Register TxintmaskclearMAC Input Vector Register Macinvector MAC Input Vector Register Macinvector Field DescriptionsReceive Interrupt Status Unmasked Register Rxintstatraw Receive Interrupt Status Masked Register Rxintstatmasked Receive Interrupt Status Masked Register RxintstatmaskedReceive Interrupt Mask Set Register Rxintmaskset Receive Interrupt Mask Clear Register Rxintmaskclear Receive Interrupt Mask Clear Register RxintmaskclearMAC Interrupt Status Unmasked Register Macintstatraw Host Stat PendMAC Interrupt Status Masked Register Macintstatmasked MAC Interrupt Status Masked Register MacintstatmaskedMAC Interrupt Mask Set Register Macintmaskset Host Stat MaskHostmask StatmaskMAC Interrupt Mask Clear Register Macintmaskclear MAC Interrupt Mask Clear Register MacintmaskclearRxpasscrc Rxqosen Rxnochain RxcmfenRxcsfen Rxcefen Rxcafen RxpromchRxbroaden RxbroadchRxmulten Receive Unicast Enable Set Register Rxunicastset RxmultchRXCH6EN RXCH5EN RXCH4EN RXCH3EN RXCH2EN RXCH1EN RXCH0EN RXCH7ENReceive Unicast Clear Register Rxunicastclear Receive Unicast Clear Register RxunicastclearReceive Maximum Length Register Rxmaxlen Receive Maximum Length Register Rxmaxlen Field DescriptionsReceive Buffer Offset Register Rxbufferoffset RxbufferOffset Rxfilterthresh Reserved RX nFLOW ThreshReceive Channel 0-7 Free Buffer Count Register RXnFREEBUFFER MAC Control Register Maccontrol MAC Control Register Maccontrol Field DescriptionsCmdidle TxptypeGIG TxpaceMAC Status Register Macstatus MAC Status Register Macstatus Field DescriptionsTxerrcode TxerrchRxerrcode RxerrchRgmiigig RgmiifullEmulation Control Register Emcontrol Emulation Control Register Emcontrol Field DescriptionsSoft Free SoftFifo Control Register Fifocontrol Fifo Control Register Fifocontrol Field DescriptionsRxfifoflowthresh TxcellthreshMAC Configuration Register Macconfig MAC Configuration Register Macconfig Field DescriptionsTxcelldepth Rxcelldepth Addresstype Maccfig TxcelldepthSoft Reset Register Softreset Soft Reset Register Softreset Field DescriptionsMAC Source Address Low Bytes Register Macsrcaddrlo MACSRCADDR0 MACSRCADDR1MACSRCADDR0 MAC Source Address High Bytes Register Macsrcaddrhi MACSRCADDR2 MACSRCADDR3 MACSRCADDR4 MACSRCADDR5MACSRCADDR2 MAC Hash Address Register 1 MACHASH1 MAC Hash Address Register 1 MACHASH1 Field DescriptionsMAC Hash Address Register 2 MACHASH2 MAC Hash Address Register 2 MACHASH2 Field DescriptionsBack Off Test Register Bofftest Back Off Test Register Bofftest Field DescriptionsRndnum CollcountTransmit Pacing Algorithm Test Register Tpacetest PacevalReceive Pause Timer Register Rxpause Receive Pause Timer Register Rxpause Field DescriptionsPausetimer Transmit Pause Timer Register Txpause Transmit Pause Timer Register Txpause Field DescriptionsMAC Address Low Bytes Register Macaddrlo MAC Address Low Bytes Register Macaddrlo Field DescriptionsValid Match Channel Filt MACADDR0 MACADDR1 ValidMAC Address High Bytes Register Macaddrhi MACADDR2 MACADDR3 MACADDR4 MACADDR5MACADDR2 MAC Index Register Macindex MAC Index Register Macindex Field DescriptionsTX nHDP RX nHDP Transmit Channel 0-7 Completion Pointer Register TXnCP Transmit Channel n Completion Pointer Register TX nCPReceive Channel 0-7 Completion Pointer Register RXnCP Receive Channel n Completion Pointer Register RX nCPNetwork Statistics Registers Statistics Register Field DescriptionsGood Receive Frames Register Rxgoodframes Broadcast Receive Frames Register RxbcastframesReceive CRC Errors Register Rxcrcerrors Receive Alignment/Code Errors Register RxaligncodeerrorsMulticast Receive Frames Register Rxmcastframes Pause Receive Frames Register RxpauseframesReceive Oversized Frames Register Rxoversized Receive Jabber Frames Register RxjabberReceive Undersized Frames Register Rxundersized Receive Frame Fragments Register RxfragmentsFiltered Receive Frames Register Rxfiltered Receive QOS Filtered Frames Register RxqosfilteredReceive Octet Frames Register Rxoctets Good Transmit Frames Register TxgoodframesBroadcast Transmit Frames Register Txbcastframes Multicast Transmit Frames Register TxmcastframesPause Transmit Frames Register Txpauseframes Deferred Transmit Frames Register TxdeferredTransmit Underrun Error Register Txunderrun Transmit Single Collision Frames Register TxsinglecollTransmit Multiple Collision Frames Register Txmulticoll Transmit Late Collision Frames Register TxlatecollTransmit Carrier Sense Errors Register Txcarriersense Transmit Octet Frames Register TxoctetsTransmit and Receive 64 Octet Frames Register FRAME64 Network Octet Frames Register Netoctets 144 Appendix a Glossary Table A-1. Physical Layer Definitions Term DefinitionAppendix B Revision History Table B-1. Document Revision HistoryImportant Notice