AM3359 datasheet(118/256 Pages) TI1

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MDIO_CLK (Output)

MDIO_DATA (Input)

118

AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

SPRS717L – OCTOBER 2011 – REVISED MARCH 2020

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Peripheral Information and Timings

7.6

Ethernet Media Access Controller (EMAC) and Switch

7.6.1

EMAC and Switch Electrical Data and Timing

The EMAC and Switch implemented in the AM335x device supports GMII mode, but the AM335x design

does not pin out 9 of the 24 GMII signals. This was done to reduce the total number of package terminals.

Therefore, the AM335x device does not support GMII mode. MII mode is supported with the remaining

GMII signals.

The AM335x and AMIC110 Sitara Processors Technical Reference Manual and this document may

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

AM335x package terminals can be multiplexed to one of several peripheral signals. For example, the

AM335x terminal names for port 1 of the EMAC 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 4-2.

Operation of the EMAC and switch is not supported for OPP50.

Table 7-7. EMAC and Switch Timing Conditions

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.

7.6.1.1

EMAC/Switch MDIO Electrical Data and Timing

Table 7-8. Timing Requirements for MDIO_DATA

(see Figure 7-3)

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 7-3. MDIO_DATA Timing - Input Mode

Table 7-9. Switching Characteristics for MDIO_CLK

(see Figure 7-4)

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

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