Texas Instruments TMS320DM643X DMP manual

www.ti.com

Peripheral Architecture

2.5.4Transmit Buffer Descriptor Format

A transmit (TX) buffer descriptor (Figure 6) is a contiguous block of four 32-bit data words aligned on a 32-bit boundary that describes a packet or a packet fragment. Example 1 shows the transmit buffer descriptor described by a C structure.

				Figure 6. Transmit Buffer Descriptor Format
Word 0
31							0
					Next Descriptor Pointer
Word 1
31							0
					Buffer Pointer
Word 2
31					16	15	0
			Buffer Offset				Buffer Length
Word 3
31	30	29	28	27	26	25	16
SOP	EOP	OWNER	EOQ	TDOWNCMPLT	PASSCRC		Reserved
15							0
					Packet Length

Example 1. Transmit Buffer Descriptor in C Structure Format

/*

//EMAC Descriptor

//The following is the format of a single buffer descriptor

//on the EM

AC.
*/
typedef struct _EMAC_Desc {
struct _EMAC_Desc *pNext;		/* Pointer to next descriptor in chain	*/
Uint8	*pBuffer;	/* Pointer to data buffer	*/
Uint32	BufOffLen;	/* Buffer Offset(MSW) and Length(LSW)	*/
Uint32	PktFlgLen;	/* Packet Flags(MSW) and Length(LSW)	*/
} EMAC_Desc;
/* Packet Flags			*/
#define EMAC_DSC_FLAG_SOP		0x80000000u
#define EMAC_DSC_FLAG_EOP		0x40000000u
#define EMAC_DSC_FLAG_OWNER		0x20000000u
#define EMAC_DSC_FLAG_EOQ		0x10000000u
#define EMAC_DSC_FLAG_TDOWNCMPLT		0x08000000u
#define EMAC_DSC_FLAG_PASSCRC		0x04000000u

20 Ethernet Media Access Controller (EMAC)/SPRU941A –April 2007

Management Data Input/Output (MDIO)	Submit Documentation Feedback

Image 20

Texas Instruments TMS320DM643X DMP manual Transmit Buffer Descriptor Format

Contents

Users Guide Submit Documentation Feedback Contents MAC Hash Address Register 1 MACHASH1 Appendix a Appendix B List of Figures Transmit Pacing Algorithm Test Register Tpacetest List of Tables Fifo Control Register Fifocontrol Field Descriptions Read This First Features Purpose of the Peripheral Functional Block Diagram Emac and Mdio Block Diagram Signal Descriptions Industry Standards Compliance StatementClock Control Memory Map Emac and Mdio Signals Signal Type Description Ethernet Protocol Overview Ethernet Frame FormatEthernet Frame Description Field Bytes Description Packet Buffer Descriptors Ethernet’s Multiple Access ProtocolProgramming Interface Basic Descriptor Description Typical Descriptor Linked List Transmit and Receive Descriptor Queues Transmit and Receive Emac Interrupts Transmit Buffer Descriptor Format Example 1. Transmit Buffer Descriptor in C Structure Format 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 Receive Buffer Descriptor Format Example 2. Receive Buffer Descriptor in C Structure Format #define Emacdscflagjabber Buffer Length Code Error Codeerror Flag Alignment Error Alignerror FlagCRC Error Crcerror Flag Jabber Flag Emac Control Module No Match Nomatch FlagInternal Memory Bus Arbiter Mdio Module Components Mdio ModuleInterrupt Control PHY Register User Access Mdio Clock GeneratorGlobal PHY Detection and Link State Monitoring Active PHY Monitoring Mdio Module Operational Overview Reading Data From a PHY Register Initializing the Mdio ModuleWriting Data To a PHY Register Example of Mdio Register Access Code Example 3. Mdio Register Access Macros Emac Module Emac Module ComponentsReceive DMA Engine Receive Fifo Clock and Reset Logic Transmit DMA EngineTransmit Fifo MAC Transmitter Media Independent Interface MII 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 DMA Host Configuration Packet Receive OperationReceive Channel Enabling Receive Address Matching Receive Channel Teardown Hardware Receive QOS SupportHost Free Buffer Tracking Promiscuous Receive Mode Receive Frame Classification Receive Frame Treatment Summary Receive Frame Treatment Middle of Frame Overrun Treatment Receive OverrunMiddle of Frame Overrun Treatment Transmit DMA Host Configuration Packet Transmit OperationReceive and Transmit Latency Transmit Channel Teardown Transfer Node Priority Reset ConsiderationsSoftware Reset Considerations Hardware Reset Considerations InitializationEnabling the EMAC/MDIO Peripheral Emac Control Module Initialization Example 5. Mdio Module Initialization Code Example 4. Emac Control Module Initialization CodeMdio Module Initialization Emac Module Initialization Interrupt Support Emac Module Interrupt Events and RequestsTransmit Packet Completion Interrupts Receive Packet Completion Interrupts Host Error Interrupt Statistics Interrupt User Access Completion Interrupt Mdio Module Interrupt Events and RequestsLink Change Interrupt Proper Interrupt Processing Emulation Control Power ManagementEmulation Considerations Emac Control Module Interrupt Control Register Ewctl Emac Control Module RegistersAcronym Register Description Bit Field Emac Control Module Interrupt Timer Count Register Ewinttcnt Mdio Version Register Version Field Descriptions Mdio Version Register VersionManagement Data Input/Output Mdio Registers Mdio Control Register Control Mdio Control Register Control Field Descriptions PHY Acknowledge Status Register Alive PHY Link Status Register LinkPHY Acknowledge Status Register Alive Field Descriptions PHY Link Status Register Link Field Descriptions No Mdio link change event Will clear the event and writing a 0 has no effect No Mdio user command complete event USERINTMASKED0 and USERINTMASKED1 correspond to USERACCESS0 WS-0 Userintmaskclear Mdio User Access Register 0 USERACCESS0 Mdio User Access Register 0 USERACCESS0 Field Descriptions Mdio User PHY Select Register 0 USERPHYSEL0 Linksel LinkintenbPhyadrmon Bit Field Value Description 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 Ethernet Media Access Controller Emac Registers Offset Acronym Register Description Offset Acronym Register Description Network Statistics Registers Transmit Control Register Txcontrol Field Descriptions Transmit Identification and Version Register TxidverTransmit Control Register Txcontrol Txtdnch Transmit Teardown Register TxteardownTransmit Teardown Register Txteardown Field Descriptions Receive Control Register Rxcontrol Field Descriptions Receive Identification and Version Register RxidverReceive Control Register Rxcontrol Rxtdnch Receive Teardown Register RxteardownReceive Teardown Register Rxteardown Field Descriptions Transmit Interrupt Status Unmasked Register Txintstatraw TX7PEND Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Status Masked Register Txintstatmasked Transmit Interrupt Mask Set Register Txintmaskset TX7MASK Transmit Interrupt Mask Clear Register Txintmaskclear Transmit Interrupt Mask Clear Register Txintmaskclear MAC Input Vector Register Macinvector MAC Input Vector Register Macinvector Field DescriptionsUserint Linkint Hostpend Statpend Rxpend Txpend Receive Interrupt Status Unmasked Register Rxintstatraw RX7PEND Receive Interrupt Status Masked Register Rxintstatmasked Receive Interrupt Status Masked Register Rxintstatmasked Receive Interrupt Mask Set Register Rxintmaskset RX7MASK Receive Interrupt Mask Clear Register Rxintmaskclear Receive Interrupt Mask Clear Register Rxintmaskclear Hostpend Statpend MAC Interrupt Status Unmasked Register MacintstatrawMAC Interrupt Status Masked Register Macintstatmasked MAC Interrupt Mask Set Register Macintmaskset MAC Interrupt Mask Clear Register MacintmaskclearHostmask Statmask Hostmask Rxpasscrc Rxqosen Rxnochain RxcmfenRxcsfen Rxcefen Rxcafen Rxpromch Frames containing errors are filtered Receive multicast channel select Receive Unicast Enable Set Register Rxunicastset RXCH7EN Receive Unicast Clear Register Rxunicastclear Receive Unicast Clear Register Rxunicastclear Receive Maximum Length Register Rxmaxlen Field Descriptions Receive Maximum Length Register RxmaxlenReceive Buffer Offset Register Rxbufferoffset Rxfilterthresh Reserved RX nFLOWTHRESH FFh Receive Channel 0-7 Free Buffer Count Register RXnFREEBUFFER MAC Control Register Maccontrol MAC Control Register Maccontrol Field Descriptions Sent. Full-duplex mode no outgoing pause frames are sent Loopback MAC Status Register Macstatus MAC Status Register Macstatus Field Descriptions MAC Status Register Macstatus Field Descriptions Bit Field Value Description Emulation Control Register Emcontrol Fifo Control Register FifocontrolEmulation Control Register Emcontrol Field Descriptions Fifo Control Register Fifocontrol Field Descriptions MAC Configuration Register Macconfig Soft Reset Register SoftresetMAC Configuration Register Macconfig Field Descriptions Soft Reset Register Softreset Field Descriptions MAC Source Address Low Bytes Register Macsrcaddrlo MAC Source Address High Bytes Register Macsrcaddrhi MAC Hash Address Register 1 MACHASH1 MAC Hash Address Register 2 MACHASH2MAC Hash Address Register 1 MACHASH1 Field Descriptions MAC Hash Address Register 2 MACHASH2 Field Descriptions Back Off Test Register Bofftest Field Descriptions Back Off Test Register BofftestTransmit Pacing Algorithm Test Register Tpacetest Receive Pause Timer Register Rxpause Transmit Pause Timer Register TxpauseReceive Pause Timer Register Rxpause Field Descriptions Transmit Pause Timer Register Txpause Field Descriptions MAC Address Low Bytes Register Macaddrlo Field Descriptions MAC Address Low Bytes Register MacaddrloMAC Address High Bytes Register Macaddrhi Macindex MAC Index Register MacindexMAC Index Register Macindex Field Descriptions TX nHDP Transmit Channel 0-7 Completion Pointer Register TXnCP Receive Channel 0-7 Completion Pointer Register RXnCP Network Statistics Registers Good Receive Frames Register RxgoodframesBroadcast Receive Frames Register Rxbcastframes Multicast Receive Frames Register Rxmcastframes Receive CRC Errors Register Rxcrcerrors Receive Alignment/Code Errors Register RxaligncodeerrorsPause Receive Frames Register Rxpauseframes Receive Oversized Frames Register Rxoversized Receive Jabber Frames Register Rxjabber Receive Undersized Frames Register RxundersizedReceive Frame Fragments Register Rxfragments Filtered Receive Frames Register Rxfiltered Good Transmit Frames Register Txgoodframes Receive QOS Filtered Frames Register RxqosfilteredReceive Octet Frames Register Rxoctets 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 Receive DMA Overruns Register Rxdmaoverruns Appendix a Glossary Table A-1. Physical Layer Definitions Term Definition Table B-1. Document Revision History Reference Additions/Modifications/Deletions Products Applications DSP