TMS320C6654 Datasheet, PDF (195/222 Pages) Texas Instruments – Fixed and Floating-Point Digital Signal Processor

TMS320C6654
Fixed and Floating-Point Digital Signal Processor
www.ti.com
SPRS841—March 2012
7.16 Ethernet Media Access Controller (EMAC)
The Ethernet Media Access Controller (EMAC) module provides an efficient interface between the TMS320C6654
DSP core processor and the networked community. The EMAC supports 10Base-T (10 Mbits/second [Mbps]), and
100BaseTX (100 Mbps), in 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).
Deviating 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 7-44. 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.
Figure 7-44 EMAC, MDIO, and EMAC Control Modules
Interrupt
Controller
Configuration Bus
DMA Memory
Transfer Controller
Peripheral Bus
EMAC/MDIO
Interrupt
EMAC Control Module
EMAC Module
MDIO Module
Ethernet Bus
MDIO Bus
For more detailed information on the EMAC/MDIO, see Gigabit Ethernet (GbE) Subsystem for KeyStone Devices
User Guide in ‘‘Related Documentation from Texas Instruments’’ on page 64.
7.16.1 EMAC Device-Specific Information
The EMAC module on the device supports Serial Gigabit Media Independent Interface (SGMII). The SGMII
interface conforms to version 1.8 of the industry standard specification.
Copyright 2012 Texas Instruments Incorporated
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Peripheral Information and Electrical Specifications 195