AM4376 datasheet(141/261 Pages) TI

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MDIO_CLK (Output)

MDIO_DATA (Input)

AM4376, AM4377, AM4378, AM4379

www.ti.com

SPRS851B – JUNE 2014 – REVISED APRIL 2015

5.12.7 Ethernet Media Access Controller (EMAC) and Switch

5.12.7.1 Ethernet MAC and Switch Electrical Data and Timing

The Ethernet MAC and Switch implemented in the device supports GMII mode, but the design does not pin out 9

of the 24 GMII signals. This was done to reduce the total number of package terminals. Therefore, the device

does not support GMII mode. MII mode is supported with the remaining GMII signals.

The AM437x Sitara Processors Technical Reference Manual (SPRUHL7) and this document may reference

internal signal names when discussing peripheral input and output signals because many of the package

terminals can be multiplexed to one of several peripheral signals. For example, the terminal names for port 1 of

the Ethernet MAC and switch have been changed from GMII to MII to indicate their Mode 0 function, but the

internal signal is named GMII. However, documents that describe the Ethernet switch reference these signals by

their internal signal name. For a cross-reference of internal signal names to terminal names, see Table 4-10.

Operation of the Ethernet MAC and switch in RGMII mode is not supported for OPP50.

Table 5-23. Ethernet MAC and Switch Timing Conditions

TIMING CONDITION PARAMETER

MIN

TYP

MAX

UNIT

Input Conditions

Input signal rise time

1(1)

5(1)

Input signal fall time

1(1)

5(1)

Output Condition

CLOAD

Output load capacitance

(1) Except when specified otherwise.

5.12.7.1.1 Ethernet MAC/Switch MDIO Electrical Data and Timing

Table 5-24. Timing Requirements for MDIO_DATA

(see Figure 5-19)

NO.

MIN

TYP

MAX

UNIT

tsu(MDIO-MDC)

Setup time, MDIO valid before MDC high

th(MDIO-MDC)

Hold time, MDIO valid from MDC high

Figure 5-19. MDIO_DATA Timing - Input Mode

Table 5-25. Switching Characteristics for MDIO_CLK

(see Figure 5-20)

NO.

PARAMETER

MIN

TYP

MAX

UNIT

tc(MDC)

Cycle time, MDC

400

tw(MDCH)

Pulse duration, MDC high

160

tw(MDCL)

Pulse duration, MDC low

160

tt(MDC)

Transition time, MDC

Specifications

141

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