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MCIMX53SMD Board Hardware User’s Guide, Rev. 0
Freescale Semiconductor
The only special equipment required to complete the bank of OBDS tests is the Ethernet loopback cable. This
can be purchased online (single plug Ethernet Lookback Cable) or it can be created by the developer by cutting
one end of an unneeded Ethernet cable and connecting pin 1 wire to pin 3 wire, and connecting pin 2 wire to
pin 6 wire. All other wires remain unconnected. The four wires used will be solid Green, solid Orange,
Green/White stripe, and Orange/White stripe. The solid colors are connected together and the striped colors
are connected together. While the solid colors will always be connected to pins 2 and 6, the specific pin a color
is attached to depends on the plug used. They same is true for the striped wires connected to pins 1 and 3.
Figure 9-1
shows a diagram of an Ethernet loopback cable.
Figure 9-1.
Ethernet Loopback Cable
10.
Troubleshooting
The MCIMX53SMD board does not have specific troubleshooting features designed into the board. The board
has proven robust during the initial test and development periods and should provide years of good service to
the developer if treated with due caution. The test pads that are included on the schematic and on the board
were not specifically designed for testing, but were placed on the board for developers who wanted to make
wire connections to specific pins that might not be available without the test pads. One basic troubleshooting
technique available to developers is to measure the voltage rail outputs on all the rails coming from the PMIC.
The subsection on PMIC voltage rails presents a diagram with points that can be used by the developer take
measurements. A second basic troubleshooting technique would be to measure the clock frequencies to
ensure that the clock is running correctly. The crystals and oscillators are located in the design section under
the i.MX53 processor.
Aside from actual hardware difficulties,
Table 10-1
presents some other issues that may help the developer
solve technical difficulties:
Symptoms
Possible Problem
Action
No 15V power to the
Attached power supply is not
Use the power supply that came
