Texas-instruments TMS320C645x DSP Manuel d'utilisateur télécharger pdf (Page 13)

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1.4 Industry Standard(s) Compliance Statement

Introduction

The EMAC peripheral conforms to the IEEE 802.3 standard, describing the “Carrier Sense Multiple Access

with Collision Detection (CSMA/CD) Access Method and Physical Layer” specifications. ISO / IEC has

also adopted the IEEE 802.3 standard and re-designated it as ISO/IEC 8802-3:2000(E).

In difference from this standard, the EMAC peripheral integrated with the C645x devices 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 intentionally generates an incorrect check sum by inverting the frame

CRC so that the network will detect the transmitted frame as an error.

SPRU975B – August 2006 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) 13

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Texas-instruments TMS320C645x DSP Manuel d'utilisateur Page 13