MDIO_CLK (Output)
1
2
MDIO_DATA (Input)
AM3359, AM3358, AM3357, AM3356, AM3354, AM3352
www.ti.com
SPRS717H –OCTOBER 2011–REVISED MAY 2015
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 Sitara Processors Technical Reference Manual (SPRUH73) and this document may
reference internal signal names when discussing peripheral input and output signals since 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 4-1.
Operation of the EMAC and switch is not supported for OPP50.
Table 7-5. EMAC and Switch Timing Conditions
PARAMETER MIN TYP MAX UNIT
Input Conditions
t
R
Input signal rise time 1
(1)
5
(1)
ns
t
F
Input signal fall time 1
(1)
5
(1)
ns
Output Condition
C
LOAD
Output load capacitance 3 30 pF
(1) Except when specified otherwise.
7.6.1.1 EMAC/Switch MDIO Electrical Data and Timing
Table 7-6. Timing Requirements for MDIO_DATA
(see Figure 7-3)
NO. MIN TYP MAX UNIT
1 t
su(MDIO-MDC)
Setup time, MDIO valid before MDC high 90 ns
2 t
h(MDIO-MDC)
Hold time, MDIO valid from MDC high 0 ns
Figure 7-3. MDIO_DATA Timing - Input Mode
Table 7-7. Switching Characteristics for MDIO_CLK
(see Figure 7-4)
NO. PARAMETER MIN TYP MAX UNIT
1 t
c(MDC)
Cycle time, MDC 400 ns
2 t
w(MDCH)
Pulse duration, MDC high 160 ns
3 t
w(MDCL)
Pulse duration, MDC low 160 ns
4 t
t(MDC)
Transition time, MDC 5 ns
Copyright © 2011–2015, Texas Instruments Incorporated Peripheral Information and Timings 119
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