Phytec phyFLEX-i.MX 6 - Software Reset of the Ethernet Controller

phyFLEX
®
-i.MX 6 [PFL-A-XL1-xxx
48  PHYTEC Messtechnik GmbH 2013 L-773e_2
pins accordingly. The Ethernet PHY also features an Auto-negotiation
to automatically determine the best speed and duplex mode.
The Ethernet controller is connected to the RGMII interface of the
i.MX 6. Please refer to the i.MX 6 Reference Manual for more
information about this interface.
In order to connect the module to an existing 10/100/1000Base-T
network some external circuitry is required. The required termination
resistors on the analog signals (ETH0_A±, ETH0_B±, ETH0_C±,
ETH0_D±) are integrated in the chip, so there is no need to connect
external termination resistors to these signals. Connection to an
external Ethernet magnetics should be done using very short signal
traces. The A+/A-, B+/B-, C+,C- and D+/D- signals should be routed
as 100 Ohm differential pairs. The same applies for the signal lines
after the transformer circuit. The carrier board layout should avoid any
other signal lines crossing the Ethernet signals.
If you are using the applicable carrier board for the phyFLEX-i.MX 6
(part number PBA-B-01), the external circuitry mentioned above is
already integrated on the board (refer to section Error! Reference
source not found.).
Caution!
Please see the datasheet of the Ethernet PHY when designing the
Ethernet transformer circuitry.
8.4.2 Software Reset of the Ethernet Controller
The Ethernet PHY at U11 can be reset by software. The reset input of
the Ethernet PHY is permanently connected to Pad EIM_D23
(GPIO3_23) of the i.MX 6.
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