Emac Control Module, Cpu | Texas Instruments TMS320C645x DSP

www.ti.com

EMAC Functional Architecture

2.6EMAC Control Module

The EMAC control module (Figure 11) interfaces the EMAC and MDIO modules to the rest of the system, and provides a local memory space to hold EMAC packet buffer descriptors. Local memory is used to avoid contention to device memory spaces. Other functions include the bus arbiter, and interrupt logic control.

Figure 11. EMAC Control Module Block Diagram

Transmit and Receive DMA Controllers

Configuration bus

EMAC interrupts

MDIO interrupts

Arbiter and			CPU
bus switches			CPU
bus switches

8K byte

descriptor memory

Configuration

registers

					Single interrupt
	Interrupt				Single interrupt
	logic				to CPU

2.6.1Internal Memory

The control module includes 8K bytes of internal memory. The internal memory block allows the EMAC to operate more independently of the CPU. It also prevents memory underflow conditions when the EMAC issues read or write requests to descriptor memory. (The EMAC'sinternal FIFOs protect memory accesses to read or write actual Ethernet packet data.)

A descriptor is a 16-byte memory structure that holds information about a single Ethernet packet buffer, which may contain a full or partial Ethernet packet. Thus, with the 8K memory block provided for descriptor storage, the EMAC module can send and receive up to a combined 512 packets before it must be serviced by application or driver software.

2.6.2Bus Arbiter

The control module’s bus arbiter operates transparently to the rest of the system. It arbitrates between the device core and EMAC buses for access to internal descriptor memory, and arbitrates between internal EMAC buses for access to system memory.

SPRU975B –August 2006

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

37

Submit Documentation Feedback

Image 37

Texas Instruments TMS320C645x DSP manual Emac Control Module, Internal Memory, Bus Arbiter, Cpu

Contents

Users Guide Submit Documentation Feedback Contents Receive Unicast Clear Register Rxunicastclear Appendix B Appendix a List of Figures Transmit Pacing Algorithm Test Register Tpacetest List of Tables MAC Control Register Maccontrol Field Descriptions Read This First Purpose of the Peripheral Features Emac and Mdio Block Diagram Functional Block Diagram Industry Standards Compliance Statement MII Clocking Clock ControlRmii Clocking Gmii Clocking Rgmii Clocking Memory Map System Level Connections Interface Selection PinsMedia Independent Interface MII Connections Mtxen Emac and Mdio Signals for MII InterfaceMrxdv Control Mtxen Mcrsdv Mrefclk Reduced Media Independent Interface Rmii ConnectionsMrxer Mdclk Mdio Emac and Mdio Signals for Rmii Interface Mtclk Gmtclk Gigabit Media Independent Interface Gmii Connections Signal Name Description Emac and Mdio Signals for Gmii Interface Txctl Refclk RXC TXCRxctl Mdclk Mdio TXC Emac and Mdio Signals for Rgmii Interface Ethernet Frame Format Ethernet Protocol OverviewEthernet Frame Description Multiple Access Protocol Packet Buffer Descriptors Programming InterfaceBasic Descriptors Typical Descriptor Linked List Transmit and Receive Descriptor Queues Transmit and Receive Emac Interrupts Example 1. Transmit Descriptor in C Structure Format Transmit Buffer Descriptor FormatSOP EOP Owner EOQ Tdown Pass Cmplt CRC Buffer Pointer Next Descriptor PointerBuffer Offset Buffer Length Ownership Owner Flag End of Packet EOP FlagEnd of Queue EOQ Flag Teardown Complete Tdowncmplt Flag Example 2. Receive Descriptor in C Structure Format Receive Buffer Descriptor Format Next Descriptor Pointer Oversize Flag Jabber Flag Alignment Error Alignerror Flag Code Error Codeerror FlagCRC Error Crcerror Flag Fragment Flag Internal Memory Emac Control ModuleBus Arbiter CPU Interrupt Control Management Data Input/Output Mdio ModuleMdio Module Components Mdio Clock Generator PHY Register User AccessGlobal PHY Detection and Link State Monitoring Active PHY Monitoring Initializing the Mdio Module Mdio Module Operational Overview Writing Data to a PHY Register Example of Mdio Register Access CodeReading Data From a PHY Register #define PHYREGreadregadr, phyadr Example 3. Mdio Register Access Macros Emac Module Components Emac ModuleReceive DMA Engine Receive Fifo Receive Address MAC ReceiverTransmit DMA Engine Transmit Fifo Emac Module Operational Overview Clock and Reset Logic Data Reception Media Independent InterfacesReceive Control Receive Inter-Frame Interval Ieee 802.3X Based Receive Buffer Flow Control Collision-Based Receive Buffer Flow Control CRC Insertion Transmit ControlAdaptive Performance Optimization APO Interpacket-Gap IPG Enforcement Speed, Duplex, and Pause Frame Support Transmit Flow Control Packet Receive Operation Receive DMA Host ConfigurationReceive Channel Enabling Hardware Receive QOS Support Receive Channel Addressing Receive Channel Teardown Host Free Buffer TrackingReceive Frame Classification Receive Frame Treatment Summary Promiscuous Receive Mode Middle of Frame Overrun Treatment Receive Overrun Packet Transmit Operation Transmit DMA Host ConfigurationReceive and Transmit Latency Transmit Channel Teardown Software Reset Considerations Reset ConsiderationsHardware Reset Considerations Transfer Node Priority Enabling the EMAC/MDIO Peripheral InitializationEmac Control Module Initialization Mdio Module Initialization Example 4. Emac Control Module Initialization CodeExample 5. Mdio Module Initialization Code Emac Module Initialization Emac Module Interrupt Events and Requests Interrupt SupportTransmit Packet Completion Interrupts Statistics Interrupt Receive Packet Completion Interrupts User Access Completion Interrupt Host Error InterruptMdio Module Interrupt Events and Requests Link Change Interrupt Emulation Considerations Power ManagementProper Interrupt Processing Interrupt Multiplexing Emac Control Module Interrupt Control Register Ewctl IntroductionEmac Control Module Registers Tcnt Ewint Management Data Input/Output Mdio Registers Mdio Version Register Version Field Descriptions Mdio Version Register VersionModid Revmaj Revmin Modid Mdio Control Register Control Field Descriptions Mdio Control Register Control PHY Acknowledge Status Register Alive Field Descriptions PHY Acknowledge Status Register Alive PHY Link Status Register Link Field Descriptions PHY Link Status Register Link 31-2 Linkint Masked Userintraw Will clear the interrupt and writing 0 has no effect Maskset Clear Userintmask Mdio User Access Register 0 USERACCESS0 Field Descriptions Mdio User Access Register 0 USERACCESS0 Linksel Linkintenb Mdio User PHY Select Register 0 USERPHYSEL0Phyadrmon Linksel 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 Softreset MacconfigRX7FREEBUFFER Maccontrol Rxaligncodeerrors RxcrcerrorsTX6CP TX7CP Netoctets FRAME1024TUPRxsofoverruns Rxmofoverruns Txident Txmajorver Txminorver Transmit Identification and Version Register TxidverTxident Transmit Control Register Txcontrol Field Descriptions Transmit Control Register TxcontrolTxen Transmit Teardown Register Txteardown Field Descriptions Transmit Teardown Register TxteardownTxtdnch Rxident Rxmajorver Rxminorver Receive Identification and Version Register RxidverRxident Receive Control Register Rxcontrol Field Descriptions Receive Control Register RxcontrolRxen Receive Teardown Register Rxteardown Field Descriptions Receive Teardown Register RxteardownRxtdnch 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 Field Descriptions MAC Input Vector Register Macinvector 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 Host Stat Pend MAC Interrupt Status Unmasked Register Macintstatraw MAC Interrupt Status Masked Register Macintstatmasked MAC Interrupt Status Masked Register Macintstatmasked Host Stat Mask MAC Interrupt Mask Set Register MacintmasksetHostmask Statmask MAC Interrupt Mask Clear Register Macintmaskclear MAC Interrupt Mask Clear Register Macintmaskclear Rxcmfen Rxpasscrc Rxqosen RxnochainRxcsfen Rxcefen Rxcafen Rxpromch Rxbroadch RxbroadenRxmulten Rxmultch Receive Unicast Enable Set Register RxunicastsetRXCH6EN RXCH5EN RXCH4EN RXCH3EN RXCH2EN RXCH1EN RXCH0EN RXCH7EN Receive Unicast Clear Register Rxunicastclear Receive Unicast Clear Register Rxunicastclear Receive Maximum Length Register Rxmaxlen Field Descriptions Receive Maximum Length Register Rxmaxlen Rxbuffer Receive Buffer Offset Register RxbufferoffsetOffset Rxfilterthresh Thresh Reserved RX nFLOW Receive Channel 0-7 Free Buffer Count Register RXnFREEBUFFER MAC Control Register Maccontrol Field Descriptions MAC Control Register Maccontrol Txptype CmdidleGIG Txpace MAC Status Register Macstatus Field Descriptions MAC Status Register MacstatusTxerrcode Txerrch Rxerrch RxerrcodeRgmiigig Rgmiifull Emulation Control Register Emcontrol Field Descriptions Emulation Control Register EmcontrolSoft Free Soft Fifo Control Register Fifocontrol Field Descriptions Fifo Control Register FifocontrolRxfifoflowthresh Txcellthresh MAC Configuration Register Macconfig Field Descriptions MAC Configuration Register MacconfigTxcelldepth Rxcelldepth Addresstype Maccfig Txcelldepth Soft Reset Register Softreset Field Descriptions Soft Reset Register Softreset MACSRCADDR0 MACSRCADDR1 MAC Source Address Low Bytes Register MacsrcaddrloMACSRCADDR0 MACSRCADDR2 MACSRCADDR3 MACSRCADDR4 MACSRCADDR5 MAC Source Address High Bytes Register MacsrcaddrhiMACSRCADDR2 MAC Hash Address Register 1 MACHASH1 Field Descriptions MAC Hash Address Register 1 MACHASH1 MAC Hash Address Register 2 MACHASH2 Field Descriptions MAC Hash Address Register 2 MACHASH2 Back Off Test Register Bofftest Field Descriptions Back Off Test Register BofftestRndnum Collcount Paceval Transmit Pacing Algorithm Test Register Tpacetest Receive Pause Timer Register Rxpause Field Descriptions Receive Pause Timer Register RxpausePausetimer Transmit Pause Timer Register Txpause Field Descriptions Transmit Pause Timer Register Txpause MAC Address Low Bytes Register Macaddrlo Field Descriptions MAC Address Low Bytes Register MacaddrloValid Match Channel Filt MACADDR0 MACADDR1 Valid MACADDR2 MACADDR3 MACADDR4 MACADDR5 MAC Address High Bytes Register MacaddrhiMACADDR2 MAC Index Register Macindex Field Descriptions MAC Index Register Macindex TX nHDP RX nHDP Transmit Channel n Completion Pointer Register TX nCP Transmit Channel 0-7 Completion Pointer Register TXnCP Receive Channel n Completion Pointer Register RX nCP Receive Channel 0-7 Completion Pointer Register RXnCP Statistics Register Field Descriptions Network Statistics RegistersGood Receive Frames Register Rxgoodframes Broadcast Receive Frames Register Rxbcastframes Receive Alignment/Code Errors Register Rxaligncodeerrors Receive CRC Errors Register RxcrcerrorsMulticast Receive Frames Register Rxmcastframes Pause Receive Frames Register Rxpauseframes Receive Jabber Frames Register Rxjabber Receive Oversized Frames Register RxoversizedReceive Undersized Frames Register Rxundersized Receive Frame Fragments Register Rxfragments Receive QOS Filtered Frames Register Rxqosfiltered Filtered Receive Frames Register RxfilteredReceive Octet Frames Register Rxoctets Good Transmit Frames Register Txgoodframes Multicast Transmit Frames Register Txmcastframes Broadcast Transmit Frames Register TxbcastframesPause Transmit Frames Register Txpauseframes Deferred Transmit Frames Register Txdeferred Transmit Single Collision Frames Register Txsinglecoll Transmit Underrun Error Register TxunderrunTransmit Multiple Collision Frames Register Txmulticoll Transmit Late Collision Frames Register Txlatecoll Transmit Octet Frames Register Txoctets Transmit Carrier Sense Errors Register TxcarriersenseTransmit and Receive 64 Octet Frames Register FRAME64 Network Octet Frames Register Netoctets 144 Appendix a Glossary Term Definition Table A-1. Physical Layer Definitions Table B-1. Document Revision History Appendix B Revision History Important Notice