TMS320C6472ECTZ datasheet(216/269 Pages) TI1

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ConfigurationBus

DMA Memory

TransferController

PeripheralBus

EMACControlModule

EMACModule

MDIOModule

MDIOBus

EMAC/MDIO

Interrupt

Controller

EthernetBus

TMS320C6472

SPRS612G

– JUNE 2009 – REVISED JULY 2011

www.ti.com

7.15 Ethernet MAC (EMAC)

The C6472 device contains two Ethernet Media Access Controller (EMAC) interfaces. Each EMAC

module provides an efficient interface between the C6472 DSP core processor and the networked

community. The EMAC supports 10Base-T (10 Mbits/second [Mbps]), and 100BaseTX (100 Mbps), in

either half- or full-duplex mode, and 1000BaseT (1000 Mbps) in full-duplex mode, with hardware flow

control and quality-of-service (QOS) support.

The EMAC module conforms to the IEEE 802.3-2002 standard, describing the

“Carrier Sense Multiple

Access with Collision Detection (CSMA/CD) Access Method and Physical Layer

” specifications. The IEEE

802.3 standard has also been adopted by ISO/IEC and re-designated as ISO/IEC 8802-3:2000(E).

One deviation from this standard, the EMAC module does not use the Transmit Coding Error signal

MTXER. Instead of driving the error pin when an underflow condition occurs on a transmitted frame, the

EMAC will intentionally generate an incorrect checksum by inverting the frame CRC, so that the

transmitted frame will be detected as an error by the network.

The EMAC control module is the main interface between the device core processor, the MDIO module,

and the EMAC module. The relationship between these three components is shown in Figure 7-47. 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-bytes of

internal RAM to hold EMAC buffer descriptors.

For more detailed information on the EMAC/MDIO, see the TMS320C6472/TMS320TCI6486 DSP

Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) Module User's Guide

(literature number SPRUEF8).

Figure 7-47. EMAC, MDIO, and EMAC Control Modules

216

C64x+ Peripheral Information and Electrical Specifications

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