Texas-instruments TMS320C645x DSP Uživatelský manuál stáhnout pdf (Strana 16)

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2.3 System Level Connections

2.3.1 Media Independent Interface (MII) Connections

MTCLK

MTXD[3−0]

MTXEN

MCOL

MCRS

MRCLK

MRXD[3−0]

MRXDV

MRXER

MDCLK

MDIO

Physical

layer

device

(PHY)

System

core

Transformer

2.5 MHz

25 MHz

RJ−45

EMACMDIO

EMAC Functional Architecture

The C645x device supports four different interfaces to a physical layer device. You can only transfer data

on one interface at a given time. Each of these interfaces is selected in hardware via the configuration

pins (MACSEL[1:0]).

Table 1 shows the possible settings for these configuration pins.

Table 1. Interface Selection Pins

MACSEL [1:0] Interface

00 MII

01 RMII

10 GMII

11 RGMII

Figure 2 shows a device with integrated EMAC and MDIO interfaced via a MII connection. This interface is

only available in 10 Mbps and 100 Mbps modes.

Figure 2. Ethernet Configuration with MII Interface

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

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Texas-instruments TMS320C645x DSP Uživatelský manuál Strana 16