Hi Harish,

Logic can do a design review of your baseboard for a nominal fee, please contact sales. Design reviews almost always find very important issues and always provide valuable feedback.

If you have imx31 dev kit use the "expansion header breakout board" in place of your module. Check all of the power in conections, 5V, 3.3V MAIN_BATTERY, and 3.3V_uP_BATT. Make sure all the gounds are good. Make sure that none of the control, data or address line have shorts to gound/power. Also if your design has devices on the data/adress lines, remove them while testing. The voltage levels of the imx31 IO is mixed bag. They not the same for the misc IO devices. You need to have level shifters or devices that use the ref volages(aka NVCCx) that are feed off of the imx31 SOM. Make sure your TX and RX lines are not crossed. Also check to make sure you are using the UARTA. You can do that without any fees.


I hope this helps,

Hi Michael,

Posted By freem on 31 Jul 2007 10:30 AM
If you have imx31 dev kit use the "expansion header breakout board" in place of your module.

what makes you believe that this will work? Comparing page 2 and page 10 of the baseboard schematics brings me to the conclusion that they are not at all compatible. Odd and even pins on both 240-pin connectors are swapped which will lead to short circuits on the base board. Did you try that?

Daniel

No I did not check this, before making this statement. I asumed that if you have 240 pin connector and another 240 pin connector you would wire it "one to one." I guess I expect too much from a system that rushed to market.

Freem,

The connectors are not wired one-to-one because high speed signals such as USB differential pairs cannot afford to have the additional signal stubs brought out to the break out board.

The intent of the break out board is to provide access to signals that do not already have a peripheral connector on the standard baseboard.

-K