It is the low voltage level as these are 1.8V inputs. The issue is making sure you get low enough, fast enough due to capacitance and at the correct frequency to yield a good data integrity. You can try using a translator buffer from 3.3V to 1.8V. That should help.
Gerald On Wed, Oct 8, 2014 at 12:55 PM, Bremenpl <[email protected]> wrote: > I could do buffers as well, thats not a problem. I am building the > board from scratch. Besides, arent the nxp input very high impedance? > > Dnia 8 października 2014 19:52:48 Gerald Coley <[email protected]> > napisał(a): > >> I am talking about you adding two NXP parts on those lines as you >> indicated that you were doing. LCD cape uses buffers do boost the signal. >> The NXP pins are 1.8V inputs. >> >> Gerald >> >> On Wed, Oct 8, 2014 at 12:38 PM, Bremenpl <[email protected]> wrote: >> >>> There are resistors on the lines, worse case scenarion I can take >>> them off. But tgose lines are used for lcd cape already so it does work, >>> whats the problem? >>> >>> Dnia 8 października 2014 19:06:54 Gerald Coley <[email protected]> >>> napisał(a): >>> >>>> I doubt it will work but you are free to try. Adding two loads such as >>>> that on those pins is asking for trouble. >>>> >>>> Gerald >>>> >>>> >>>> On Wed, Oct 8, 2014 at 1:50 AM, bremenpl <[email protected]> wrote: >>>> >>>>> Hello there, >>>>> I am currently working on a motherboard for the BeagleBone Black. One >>>>> of the requiments is to have a HDMI output on the side of the motherboard. >>>>> I Know that there are LCD pins on the BeagleBone Black header and there is >>>>> a possibility to connect a LCD cape. I was wondering either it would work >>>>> to duplicate the NXP HDMI framer circuit that is on the board to the >>>>> motherboard and use it for hdmi output? If I am correct the only >>>>> difference >>>>> would be that there is no acces to I2C0 from headers so I would have to >>>>> use >>>>> I2C1/2 for the NXP chip. That way at least I wont chave to worry about >>>>> addressing 2 chips at once (not sure If you can change address of the hdmi >>>>> framer yet). >>>>> >>>>> My question is, would this solution be bard to implement in software, >>>>> or is it easy to change the I2C bus config for hdmi? Are there any >>>>> obstacles that I am not aware of? I would really aprichiate any help in >>>>> here. >>>>> >>>>> -- >>>>> For more options, visit http://beagleboard.org/discuss >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "BeagleBoard" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "BeagleBoard" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/85MgiQg0wJY/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
