Texas Instruments TMS320C645x DSP - Manual (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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