Mdio Clock Generator, Userint | Texas Instruments TMS320C674X

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Architecture

Figure 10. MDIO Module Block Diagram
Peripheral	MDIO
clock	MDIO
clock	clock
	clock
	generator	MDIO
USERINT		MDIO
USERINT		interface
EMAC
control
module
LINKINT	PHY	PHY
	monitoring	polling
	Control
Configuration bus	registers
	and logic

MDCLK

MDIO

2.7.1.1MDIO Clock Generator

The MDIO clock generator controls the MDIO clock based on a divide-down of the peripheral clock in the EMAC control module. The MDIO clock is specified to run up to 2.5 MHz, although typical operation would be 1.0 MHz. Since the peripheral clock frequency is variable, the application software or driver controls the divide-down amount. See your device-specific data manual for peripheral clock speeds.

2.7.1.2Global PHY Detection and Link State Monitoring

The MDIO module continuously polls all 32 MDIO addresses in order to enumerate the PHY devices in the system. The module tracks whether or not a PHY on a particular address has responded, and whether or not the PHY currently has a link. Using this information allows the software application to quickly determine which MDIO address the PHY is using.

2.7.1.3Active PHY Monitoring

Once a PHY candidate has been selected for use, the MDIO module transparently monitors its link state by reading the MDIO PHY link status register (LINK). Link change events are stored on the MDIO device and can optionally interrupt the CPU. This allows the system to poll the link status of the PHY device without continuously performing costly MDIO accesses.

2.7.1.4PHY Register User Access

When the CPU must access MDIO for configuration and negotiation, the PHY access module performs the actual MDIO read or write operation independent of the CPU. This allows the CPU to poll for completion or receive an interrupt when the read or write operation has been performed. The user access registers USERACCESSn allows the software to submit the access requests for the PHY connected to the device.

SPRUFL5B –April 2011	EMAC/MDIO Module	31
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Texas Instruments TMS320C674X Mdio Clock Generator, Global PHY Detection and Link State Monitoring, Active PHY Monitoring

Contents

Users Guide Submit Documentation Feedback C0MISCEN-C2MISCEN C0TXIMAX-C2TXIMAX Appendix B Appendix a List of Figures MAC Interrupt Mask Clear Register Macintmaskclear List of Tables MAC Control Register Maccontrol Field Descriptions Read This First Related Documentation From Texas Instruments Purpose of the Peripheral Features Emac and Mdio Block Diagram Functional Block Diagram Memory Map Signal DescriptionsIndustry Standards Compliance Statement Clock Control Signal Type Description Emac and Mdio Signals for MII Interface Reduced Media Independent Interface Rmii Connections Emac and Mdio Signals for Rmii Interface Field Bytes Description Ethernet Protocol OverviewEthernet Frame Format Ethernet Frame Description Word Ethernet’s Multiple Access ProtocolProgramming Interface Packet Buffer Descriptors Field Field Description Basic Descriptor Description Transmit and Receive Descriptor Queues Transmit Buffer Descriptor Format Transmit and Receive Emac Interrupts Example 1. Transmit Buffer Descriptor in C Structure Format Transmit Buffer Descriptor Format Buffer Length Next Descriptor PointerBuffer Pointer Buffer Offset Teardown Complete Tdowncmplt Flag End of Packet EOP FlagOwnership Owner Flag End of Queue EOQ Flag Receive Buffer Descriptor Format Receive Buffer Descriptor Format Example 2. Receive Buffer Descriptor in C Structure Format Buffer Length Jabber Flag Code Error Codeerror FlagAlignment Error Alignerror Flag CRC Error Crcerror Flag CPU Emac Control ModuleInternal Memory Bus Arbiter Interrupt Control Mdio ModuleMdio Module Components Active PHY Monitoring PHY Register User AccessMdio Clock Generator Global PHY Detection and Link State Monitoring Mdio Module Operational Overview Writing Data To a PHY Register Initializing the Mdio ModuleReading Data From a PHY Register Example 3. Mdio Register Access Macros Example of Mdio Register Access Code Receive Fifo Emac ModuleEmac Module Components Receive DMA Engine MAC Transmitter Clock and Reset LogicTransmit DMA Engine Transmit Fifo Receive Inter-Frame Interval MAC InterfaceData Reception Receive Control Ieee 802.3x-Based Receive Buffer Flow Control Collision-Based Receive Buffer Flow Control Interpacket-Gap IPG Enforcement Transmit ControlCRC Insertion Adaptive Performance Optimization APO Speed, Duplex, and Pause Frame Support Transmit Flow Control Receive Address Matching Receive DMA Host ConfigurationPacket Receive Operation Receive Channel Enabling Host Free Buffer Tracking Hardware Receive QOS SupportReceive Channel Teardown Receive Frame Classification Promiscuous Receive Mode Receive Frame Treatment Receive Frame Treatment Summary Middle of Frame Overrun Treatment Receive OverrunMiddle of Frame Overrun Treatment Packet Transmit Operation Transmit DMA Host ConfigurationTransmit Channel Teardown Transfer Node Priority Receive and Transmit Latency Software Reset Considerations Reset ConsiderationsHardware Reset Considerations Mdio Module Initialization InitializationEnabling the EMAC/MDIO Peripheral Emac Control Module Initialization Macintmaskset Emac Module Initialization Receive Packet Completion Interrupts Interrupt SupportEmac Module Interrupt Events and Requests Transmit Packet Completion Interrupts Statistics Interrupt Host Error Interrupt Mdio Module Interrupt Events and Requests Receive Threshold InterruptsLink Change Interrupt Proper Interrupt Processing User Access Completion InterruptInterrupt Multiplexing Emulation Considerations Power ManagementEmulation Control Acronym Register Description Emac Control Module Registers Offset Acronym Register Description Emac Control Module Revision ID Register RevidBit Field Value Description Reset Emac Control Module Software Reset Register Softreset Intprescale Emac Control Module Interrupt Control Register IntcontrolC2TXPACEEN Bit Field RXCH7EN TXCH7EN Statpenden Statpenden Hostpenden LINKINT0EN USERINT0EN RXCH4THRESHSTAT RXCH7THRESHSTATRXCH6THRESHSTAT RXCH5THRESHSTAT RXCH7STAT TXCH7STAT USERINT0STAT StatpendstatHostpendstat LINKINT0STAT Allowemacinterrupts Rximax Tximax Management Data Input/Output Mdio Registers Mdio Revision ID Register RevidMdio Revision ID Register Revid Field Descriptions Mdio Control Register Control Field Descriptions Mdio Control Register Control PHY Link Status Register Link Field Descriptions PHY Acknowledge Status Register AlivePHY Link Status Register Link PHY Acknowledge Status Register Alive Field Descriptions USERPHY1 USERPHY1 USERPHY0 Writing a 0 has no effect USERACCESS1 USERACCESS0 Effect W1S-0 Userintmaskclear Mdio User Command Complete Interrupt Mask Clear Register Mdio User Access Register 0 USERACCESS0 Field Descriptions Mdio User Access Register 0 USERACCESS0 Linksel Mdio User PHY Select Register 0 USERPHYSEL0Linksel Linkintenb Phyadrmon Mdio User Access Register 1 USERACCESS1 Field Descriptions Mdio User Access Register 1 USERACCESS1 Mdio User PHY Select Register 1 USERPHYSEL1 Mdio User PHY Select Register 1 USERPHYSEL1 Ethernet Media Access Controller Emac Registers Fifocontrol MacconfigMacstatus Emcontrol Network Statistics Registers Transmit Control Register Txcontrol Field Descriptions Transmit Revision ID Register TxrevidTransmit Control Register Txcontrol Transmit Revision ID Register Txrevid Field Descriptions Transmit Teardown Register Txteardown Field Descriptions Transmit Teardown Register TxteardownTxtdnch Receive Control Register Rxcontrol Field Descriptions Receive Revision ID Register RxrevidReceive Control Register Rxcontrol Receive Revision ID Register Rxrevid Field Descriptions Receive Teardown Register Rxteardown Field Descriptions Receive Teardown Register RxteardownRxtdnch TX7PEND Transmit Interrupt Status Unmasked Register Txintstatraw Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Status Masked Register Txintstatmasked TX7MASK Transmit Interrupt Mask Set Register Txintmaskset Transmit Interrupt Mask Clear Register Txintmaskclear Transmit Interrupt Mask Clear Register Txintmaskclear RX0THRESHPEND MAC Input Vector Register MacinvectorMAC Input Vector Register Macinvector Field Descriptions Statpend Intvect MAC End Of Interrupt Vector Register Maceoivector 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 Masked Register Macintstatmasked MAC Interrupt Status Unmasked Register MacintstatrawHostpend Statpend Hostmask MAC Interrupt Mask Set Register MacintmasksetMAC Interrupt Mask Clear Register Macintmaskclear Hostmask Statmask Rxpromch Rxpasscrc Rxqosen RxnochainRxcmfen Rxcsfen Rxcefen Rxcafen Frames containing errors are filtered Receive multicast channel select Receive Unicast Enable Set Register Rxunicastset Receive Unicast Enable Set Register Rxunicastset Receive Unicast Clear Register Rxunicastclear Receive Unicast Clear Register Rxunicastclear Receive Buffer Offset Register Rxbufferoffset Receive Maximum Length Register RxmaxlenReceive Maximum Length Register Rxmaxlen Field Descriptions Rxfilterthresh Receive Channel Flow Control Threshold Registers Receive Channel n Free Buffer Count Register RXnFREEBUFFER MAC Control Register Maccontrol Field Descriptions MAC Control Register Maccontrol Fullduplex TxflowenRxbufferflowen Loopback MAC Status Register Macstatus Field Descriptions MAC Status Register Macstatus Rxqosact Fifo Control Register Fifocontrol Field Descriptions Emulation Control Register EmcontrolFifo Control Register Fifocontrol Emulation Control Register Emcontrol Field Descriptions Soft Reset Register Softreset Field Descriptions MAC Configuration Register MacconfigSoft Reset Register Softreset MAC Configuration Register Macconfig Field Descriptions MAC Source Address High Bytes Register Macsrcaddrhi MAC Source Address Low Bytes Register Macsrcaddrlo MAC Hash Address Register 2 MACHASH2 Field Descriptions MAC Hash Address Register 1 MACHASH1MAC Hash Address Register 2 MACHASH2 MAC Hash Address Register 1 MACHASH1 Field Descriptions Transmit Pacing Algorithm Test Register Tpacetest Back Off Test Register BofftestBack Off Test Register Bofftest Field Descriptions Transmit Pause Timer Register Txpause Field Descriptions Receive Pause Timer Register RxpauseTransmit Pause Timer Register Txpause Receive Pause Timer Register Rxpause Field Descriptions Valid MAC Address Low Bytes Register MacaddrloMAC Address Low Bytes Register Macaddrlo Field Descriptions Valid Matchfilt Channel MACADDR0 MACADDR1 MACADDR2 MACADDR3 MACADDR4 MACADDR5 MAC Address High Bytes Register MacaddrhiMAC Index Register Macindex MAC Index Register Macindex Field Descriptions TXnHDP Receive Channel Completion Pointer Registers RX0CP-RX7CP Transmit Channel Completion Pointer Registers TX0CP-TX7CP Multicast Receive Frames Register Rxmcastframes Network Statistics RegistersGood Receive Frames Register Rxgoodframes Broadcast Receive Frames Register Rxbcastframes Receive Alignment/Code Errors Register Rxaligncodeerrors Receive CRC Errors Register RxcrcerrorsPause Receive Frames Register Rxpauseframes Receive Frame Fragments Register Rxfragments Receive Oversized Frames Register RxoversizedReceive Jabber Frames Register Rxjabber Receive Undersized Frames Register Rxundersized Receive Octet Frames Register Rxoctets Receive QOS Filtered Frames Register RxqosfilteredGood Transmit Frames Register Txgoodframes Deferred Transmit Frames Register Txdeferred Broadcast Transmit Frames Register TxbcastframesMulticast Transmit Frames Register Txmcastframes Pause Transmit Frames Register Txpauseframes Transmit Late Collision Frames Register Txlatecoll Transmit Underrun Error Register TxunderrunTransmit Single Collision Frames Register Txsinglecoll Transmit Multiple Collision Frames Register Txmulticoll Transmit Octet Frames Register Txoctets Transmit Carrier Sense Errors Register TxcarriersenseTransmit and Receive 64 Octet Frames Register FRAME64 Network Octet Frames Register Netoctets Receive DMA Overruns Register Rxdmaoverruns Appendix a Glossary Term Definition Physical Layer Definitions Reference Additions/Modifications/Deletions Document Revision History TI E2E Community Home Products ApplicationsDSP Rfid