REL 1.2
Page 18 of 56
i.MX6 SODIMM SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.6.2
Gigabit Ethernet
i.MX6 SODIMM SOM supports one 10/100/1000Mbps Ethernet interface on SODIMM Edge connector through
RGMII interface. The MAC is integrated in the i.MX6 CPU and connected to the external Ethernet PHY on SOM. Since
MAC and PHY are supported on SOM itself, only Magnetics are required on the carrier board. i.MX6 SODIMM SOM
also supports Link and Speed indication LED control signals to SODIMM Edge.
i.MX6 SODIMM SOM supports
one “
KSZ9031RNXCA
”
Ethernet PHY from Micrel. These PHY
’s are
interfaced with
i.MX6 CPU using RGMII interface and works at 1.8V IO voltage level. Since this PHY
doesn’t require
center tap supply
to the magnetics, CTREF voltage to SODIMM Edge is not supported on SOM. It is recommended that center tap pins
of magnetics should be separated from one another and connected through separate 0.1uF common mode
capacitors to ground. The below table provides the compatible magnetics recommended by PHY Manufacturer.
Table 4: Compatible Magnetics
Part Description
Part Number
Manufacturer
Temperature
Gigabit Ethernet Discrete Transformer
TG1G-E001NZRL
HALO
-40°C to 85°C
Gigabit Ethernet Discrete Transformer
HX5008NL
Pulse
-40°C to 85°C
RJ45 Magjack with two Green LED
JK0654219NL
Pulse
0°C to 70°C
RJ45 Magjack with two Green LED
0826-1G1T-23F
Bel Fuse
0°C to 70°C
Gigabit Ethernet Discrete Transformer
000-7093-37R-LF1
Wurth
0°C to 70°C
For more details, refer SODIMM Edge connector pins 2, 4, 6, 8, 14, 16, 15 & 17 on
Note: As per i.MX6 CPU Errata ERR004512, Gigabit Ethernet MAC has throughout limitation. The theoretical
maximum performance of 1Gbps ENET is limited to 470 Mbps (total for Tx and Rx). The actual measured performance
in an optimized environment is up to 400 Mbps.
2.6.3
PCIe Interface
i.MX6
SODIMM SOM supports one PCI Express Gen2.0 lane on SODIMM Edge connector. i.MX6 CPU’s PCIe Express
core with integrated PHY is used for PCIe Interface which can support PCIe Gen2.0 at 5Gbps data rate and are
backward compatible to Gen1.1 at 2.5Gbps data rate. PCIe wake input and PCIe reset output are supported on
SODIMM Edge connector from i.MX6 CPU GPIOs GPIO_2 & GPIO_16 correspondingly.
For more details, refer SODIMM Edge connector pins 127, 128, 129, 130, 132, 134, 135 & 137 on
Note: Termination is required on the PCIe differential clock lines and should be placed as close as possible to the
receiver device input or PCIe connector. Connect two 49.9 Ω resistors between REFCLK
- and GND & and
GND. Alternately, Connect a 100 Ω resistor between REFCLK
- and . PCIe differential transmitter lines are ac
coupled on SOM itself.