You are kidding. Gerald
On Fri, Oct 17, 2014 at 7:30 AM, bremenpl <[email protected]> wrote: > Hello there again Gerald, > I was trying to get a piece of TDA19988 chip but he is not avaible in a > single distributor :|. I was trying to find some simmilar chips from other > distributors but I am not sure either they would be compatible. Would you > mind helping me out in this case? > > W dniu środa, 8 października 2014 21:03:58 UTC+2 użytkownik Gerald napisał: >> >> If you do it right, you should have nothing to do. But, be warned, the >> expansion connectors are not what you call high speed. So it is possible >> that your HDMI may not be able to get to the same resolution as the one on >> the board. >> >> Gerald >> >> >> On Wed, Oct 8, 2014 at 2:00 PM, Bremenpl <[email protected]> wrote: >> >>> I see now. Thank you a lot, i will take this under consideration when >>> I get to the hdmi part in my board. I already aprichiate your help, but do >>> you have any other tips that might help? Any software config problems you >>> predict? >>> >>> Dnia 8 października 2014 20:54:39 Gerald Coley <[email protected]> >>> napisał(a): >>> >>>> No there are not. That is why I am saying you need them on the >>>> expansion board. The reason there is no buffer on the board is because it >>>> had to be cheap and fit in an Altoids box. I could not do that and add the >>>> buffer, >>>> >>>> By buffers I mean like the one used on the LCD board. >>>> https://github.com/CircuitCo/BeagleBone-LCD7- >>>> RevA3/blob/master/BeagleBone-LCD7-RevA3-schematic.pdf?raw=true >>>> >>>> Look at U1. Replace the VDD_LCD with 1.8V. >>>> >>>> >>>> Gerald >>>> >>>> >>>> On Wed, Oct 8, 2014 at 1:48 PM, Bremenpl <[email protected]> wrote: >>>> >>>>> I am only asking, no hard feelings :p. Ive just noticed that there >>>>> were no buffers on the lcd lines between nxp and mcu on the bbb. Thats why >>>>> I asked. Why are there no buffers on the bbb? By buffers do you mean that >>>>> a >>>>> voltage follower would do if the inputs are 3.3V tollerant? >>>>> >>>>> Dnia 8 października 2014 20:44:37 Gerald Coley <[email protected]> >>>>> napisał(a): >>>>> >>>>>> It already is powered from 1.8V. The processor however, is powered >>>>>> from 3.3V. The NXP part is 3.3V tolerant. >>>>>> >>>>>> You need the buffer to clean up the signals and provide better drive >>>>>> as is being done on the LCD boards.. >>>>>> >>>>>> I just designed the BeagleBone Black. You are designing your mother >>>>>> board so do as you see fit. >>>>>> >>>>>> Gerald >>>>>> >>>>>> >>>>>> On Wed, Oct 8, 2014 at 1:37 PM, Bremenpl <[email protected]> wrote: >>>>>> >>>>>>> Cant I just power the NXP from 1.8V? If the lines are 1.8V I >>>>>>> would need no translation then. Also there are no buffer on the bbb >>>>>>> itself >>>>>>> so why would I need such? >>>>>>> >>>>>>> Dnia 8 października 2014 20:12:06 Gerald Coley < >>>>>>> [email protected]> napisał(a): >>>>>>> >>>>>>>> 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 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 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. > -- 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.
