-----Original Message-----
From: Vincent Chan [mailto:vyschan@ee.usyd.edu.au]
Sent: Wednesday, 13 June 2007 10:45 AM
To: 'Raphael Berner'; 'tobi@ini.phys.ethz.ch'
Subject: RE: USB2AERmini2 board
Thanks for the help and clarification, Tobi and Raphael.
Do the inputs of the CPLD have clamping diode? If so, a current limiting
resistor at each input should do the trick.
Vincent
-----Original Message-----
From: Raphael Berner [mailto:bernerr@ee.ethz.ch]
Sent: Tuesday, 12 June 2007 8:44 PM
To: tobi@ini.phys.ethz.ch
Cc: Vincent Chan
Subject: Re: USB2AERmini2 board
> i guess the cochlea doesn't
> > fill the whole address space and then you should just leave the unused
> > address bits *floating* and not tied hard to ground. (is that correct
> > raphael?). actually maybe you can tie the unused address bits to ground
> > because on the USB2AERmini2 board the timestamps don't share the address
> > bus.
> >
doesn't really matter. if you don't tie lines to ground, you can use the
board for other devices as well. but if you don't plan to do that
anyway, then it's probably better to tie them to ground.
only the bus between CPLD and FX2 is shared between address and
timestamp lines, so that's no problem.
> >
> > Raphael Berner wrote:
>> >> sorry, up to 3.9V.
>> >> it probably wouldn't destroy the device if you apply 5V, but i
>> >> wouldn't do it...
>> >>
>> >> Tobi Delbruck schrieb:
>>> >>> it may be that the cpld is 5V input- tolerant. what is the part
>>> >>> number of the CPLD? is the datasheet in the repository?
>>> >>> tobi
>>> >>>
>>> >>>
>>> >>> Raphael Berner wrote:
>>>> >>>> Hi Vincent
>>>> >>>>
>>>> >>>> The board is operating at 3.3V, so you shouldn't interface it to 5V
>>>> >>>> boards directly...
>>>> >>>>
>>>> >>>> Regards,
>>>> >>>> raphael
>>>> >>>>
>>>> >>>> Tobi Delbruck schrieb:
>>>>> >>>>> vincent - you guys are bringing that board to telluride, right?
>>>>> >>>>> raphael is the right guy to ask about this. can you answer vincent?
>>>>> >>>>>
>>>>> >>>>> maybe you could put it on the jaer FAQ too?
>>>>> >>>>>
>>>>> >>>>> vincent - sign up for an account at soureforge and i'll make you
>>>>> >>>>> developeer on http://jaer.wiki.sourceforge.net. the right place to
>>>>> >>>>> ask these questions is through the jear discussion forums.
>>>>> >>>>> TD
>>>>> >>>>>
>>>>> >>>>>
>>>>> >>>>> Vincent Chan wrote:
>>>>>> >>>>>> Hi Tobi,
>>>>>> >>>>>>
>>>>>> >>>>>> I got the board from Andre and we are going to try it out on the
>>>>>> >>>>>> old AER
>>>>>> >>>>>> cochlea chip. I'm wondering if the board accepts both 3.3V and 5V AER
>>>>>> >>>>>> signals.
>>>>>> >>>>>>
>>>>>> >>>>>> Thanks
>>>>>> >>>>>>
>>>>>> >>>>>> Vincent
>>>>>> >>>>>>
>>>>>> >>>>>>
>>>>>> >>>>>>
>>>>> >>>>>
>>> >>>
>>> >>>
> >
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Found this document http://direct.xilinx.com/bvdocs/appnotes/xapp429.pdf
So it looks like the series resistor will not work. Probably will stick to
the voltage divider then.
Vincent
-----Original Message-----
From: Vincent Chan [mailto:vyschan@ee.usyd.edu.au]
Sent: Wednesday, 13 June 2007 10:45 AM
To: 'Raphael Berner'; 'tobi@ini.phys.ethz.ch'
Subject: RE: USB2AERmini2 board
Thanks for the help and clarification, Tobi and Raphael.
Do the inputs of the CPLD have clamping diode? If so, a current limiting
resistor at each input should do the trick.
Vincent
-----Original Message-----
From: Raphael Berner [mailto:bernerr@ee.ethz.ch]
Sent: Tuesday, 12 June 2007 8:44 PM
To: tobi@ini.phys.ethz.ch
Cc: Vincent Chan
Subject: Re: USB2AERmini2 board
> i guess the cochlea doesn't
> > fill the whole address space and then you should just leave the unused
> > address bits *floating* and not tied hard to ground. (is that correct
> > raphael?). actually maybe you can tie the unused address bits to ground
> > because on the USB2AERmini2 board the timestamps don't share the address
> > bus.
> >
doesn't really matter. if you don't tie lines to ground, you can use the
board for other devices as well. but if you don't plan to do that
anyway, then it's probably better to tie them to ground.
only the bus between CPLD and FX2 is shared between address and
timestamp lines, so that's no problem.
> >
> > Raphael Berner wrote:
>> >> sorry, up to 3.9V.
>> >> it probably wouldn't destroy the device if you apply 5V, but i
>> >> wouldn't do it...
>> >>
>> >> Tobi Delbruck schrieb:
>>> >>> it may be that the cpld is 5V input- tolerant. what is the part
>>> >>> number of the CPLD? is the datasheet in the repository?
>>> >>> tobi
>>> >>>
>>> >>>
>>> >>> Raphael Berner wrote:
>>>> >>>> Hi Vincent
>>>> >>>>
>>>> >>>> The board is operating at 3.3V, so you shouldn't interface it to 5V
>>>> >>>> boards directly...
>>>> >>>>
>>>> >>>> Regards,
>>>> >>>> raphael
>>>> >>>>
>>>> >>>> Tobi Delbruck schrieb:
>>>>> >>>>> vincent - you guys are bringing that board to telluride, right?
>>>>> >>>>> raphael is the right guy to ask about this. can you answer vincent?
>>>>> >>>>>
>>>>> >>>>> maybe you could put it on the jaer FAQ too?
>>>>> >>>>>
>>>>> >>>>> vincent - sign up for an account at soureforge and i'll make you
>>>>> >>>>> developeer on http://jaer.wiki.sourceforge.net. the right place to
>>>>> >>>>> ask these questions is through the jear discussion forums.
>>>>> >>>>> TD
>>>>> >>>>>
>>>>> >>>>>
>>>>> >>>>> Vincent Chan wrote:
>>>>>> >>>>>> Hi Tobi,
>>>>>> >>>>>>
>>>>>> >>>>>> I got the board from Andre and we are going to try it out on the
>>>>>> >>>>>> old AER
>>>>>> >>>>>> cochlea chip. I'm wondering if the board accepts both 3.3V and 5V AER
>>>>>> >>>>>> signals.
>>>>>> >>>>>>
>>>>>> >>>>>> Thanks
>>>>>> >>>>>>
>>>>>> >>>>>> Vincent
>>>>>> >>>>>>
>>>>>> >>>>>>
>>>>>> >>>>>>
>>>>> >>>>>
>>> >>>
>>> >>>
> >