LDCKC6748 hardware problems

Hi llich,

I have an answer for the first question. Some one else can help you for the rest.

llich said:

Regarding with the NAND memory exist a discrepancy because in document OMAP-L138_C6748 Dev Kit Ver A6.pdf (downloadable from the page http://www.ti.com/tool/tmdxlcdk6748) for the NAND FLASH (U18) appears as part number the MT29F1G08ABCHC:C but in the LCDKC6748 User Guide (http://processors.wiki.ti.com/index.php/LCDK_User_Guide) appears the MT29F4G16ABADAH4-IT:D, the question is: which is the correct?

yes, there is a discrepancy. In OMAP-L138_C6748 Dev Kit Ver A6.pdf, the part number of NAND is given as MT29F1G08ABCHC:C but in the user guide as well as in the hardware board ( C6748 LCDK Rev A5 ) , MT29F4G16ABADAH4:D ( 4 GB density, x16 width, SLC ) is observed.

It was already brought to TI team's notice. It will be corrected soon.

Regards,

Shankari

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Hi llich,

1.We have updated the wiki wih the updated schematics reflect the  MT29F4G16ABADAH4-IT:D

2.Regarding with the connector for a Leopard camera (J16) well I plugged a Leopard camera (LI-CAM-OV2715) but nothing happened because exist a problem with the pixel clock caused by the component 74LVC1G126DBV (U27) used for the TVP5147M1PFP (U21). I have to remove this component in order to fix the problem otherwise the pixel clock was near to high level (never descend to low level). What can I do instead remove the U27 component? Have you probed the U27 OE pin at this condition? Can you check R41 Pull-up resistor is mounted? If mounted can you please remove and change it to 4.7K and check again.

3.One more thing, I plugged a monitor LCD (Samsung) to a VGA connector (J8) and the LDCKC6748 stopped. I guess that the connection with the monitor caused an overvoltage because the Power Manager (TPS650250RHBR/U3) stop to generate the necessary voltage. Is that assumption correct? VGA connector power 5V_IN is sourced directly from the external adapter .So, there should not be any problem with the Power drop just in case try with other adapter which is capable of handling more power .Check you monitor earth condition check any leakage voltage at the VGA connector shield. Check the cable for VCC and GND short . Try other VGA cable and monitor.

Regards

Antony

Hi Antony

I checked the OE signal and I guess is fine, actually the signal are depicted in the follow picture

Right now I can’t change the resistor R41 because my LCDKC6748 don't work for an unknown problem (I’ll write regarding on this below). But let me suggest something, but first let me explain my assumption. I believe that the U27 output is always be 3.3V (doesn’t matter if the U27 input is  high impedance as correspond), so the VPIF_CLKIN0 signal is always be 3.3 V. This is a problem because the Leopard Camera tries to drive this signal too. Actually the next figure shows the signal VPIF_CLKIN0 (when the U27 is present and when the Leopard is plugged).

And maybe the solution for this problem could be either putting a switch at U27 OE pin or putting a GPIO signal to handle the U27 OE. But for those who had been already purchased the LCDKC6748 the simple solution in order to use the Leopard Camera, is remove the U27 (of course this solution will stop the use of the decodec video until the U27 will be placed again). I removed the U27 and worked fine.

Of course Antony, you and your team are the best to suggest other better solution and certainly I can change the R41 when my new LCDKC6748 arrives and tell you the results.

And regarding the last point, my LCDKC6748 was suffered a damage (as I said before). I believe that it was caused when I plugged the VGA connector but I’m not sure. Right now my LCDKC6748 don’t work despite I removed the VGA connector (actually I removed everything), so I ordered a new one (too shame). When the new one arrives I’ll try to fix the older (I’ll replace the U2 and U3 components) and I’ll see what happen, wish me luck. Then I’ll be able to report to all of you my results.

Sincerely  Ilich

Llich,

Thanks for the explanation.

 We understood that the CAM_CLK net from the Leopard Camera module (J16) tries to drive the VPIF_CLKIN0 Pin too. The only way to isolate is to remove the U27 or to make U27 OE pin Low.

We keep a track of it and do the necessary modification in the upcoming schematic revisions or we look for some other alternative option to disable the TVP5147 DATACLK through I2C.we let you know once we fix this.

Thanks for your suggestions.

Regards

Antony

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