Texas Instruments TMS320C6454 warranty Ethernet MAC Emac, Ethernet Bus

TMS320C6454

Fixed-Point Digital Signal Processor

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SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

7.14 Ethernet MAC (EMAC)

The Ethernet Media Access Controller (EMAC) module provides an efficient interface between the C6454 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 “CarrierSense 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).

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 7-58. 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. The relationship between these three components is shown in Figure 7-58.

Interrupt	Configuration Bus		DMA Memory	PREVIEW
Controller
		Transfer Controller
		Peripheral Bus		PRODUCT
EMAC/MDIO	EMAC Control Module
Interrupt	EMAC Module		MDIO Module

Ethernet Bus MDIO Bus

Figure 7-58. EMAC, MDIO, and EMAC Control Modules

For more detailed information on the EMAC/MDIO, see the TMS320C645x DSP EMAC/MDIO Module Reference Guide (literature number SPRU975).

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