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Old 10-23-2003, 04:31 AM
Ben Popoola
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Default Altera cyclone circuit board indicator

I wish to connect a LED to the CONF_DONE pin of a cyclone FPGA to
indicate when configuration has been completed.

The CONF_DONE pin is an open collector pin that is pulled high via a 10K
resistor when configuration is completed.

Do I connect my circuit board indicator to ground (through another
resistor) or should I connect it to the power rail?

Thanks
Ben

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  #2 (permalink)  
Old 10-23-2003, 06:21 PM
Khim Bittle
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Default Re: Altera cyclone circuit board indicator

On Thu, 23 Oct 2003 04:31:26 +0100, Ben Popoola
<[email protected]> wrote:

>I wish to connect a LED to the CONF_DONE pin of a cyclone FPGA to
>indicate when configuration has been completed.
>
>The CONF_DONE pin is an open collector pin that is pulled high via a 10K
>resistor when configuration is completed.
>
>Do I connect my circuit board indicator to ground (through another
>resistor) or should I connect it to the power rail?
>
>Thanks
>Ben
>


Another idea which I just used on a cyclone design .. i put a small
smt led from the NCEO pin to ground via a 220 resistor, the led
flashes when power is first applied during configuration, if the led
remains on there is a problem. I like this particularly for multiple
cyclones loading from one flash device since each cyclone can have
it's own led beside the chip indicating which cyclone did not
configure instead of using the conf_done pins because these are tied
together for a multiple cyclone string and cannot point to the chip.

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  #3 (permalink)  
Old 10-26-2003, 08:01 AM
Ben Popoola
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Default Re: Altera cyclone circuit board indicator

Khim Bittle wrote:

> On Thu, 23 Oct 2003 04:31:26 +0100, Ben Popoola
> <[email protected]> wrote:
>
>
>>I wish to connect a LED to the CONF_DONE pin of a cyclone FPGA to
>>indicate when configuration has been completed.
>>
>>The CONF_DONE pin is an open collector pin that is pulled high via a 10K
>>resistor when configuration is completed.
>>
>>Do I connect my circuit board indicator to ground (through another
>>resistor) or should I connect it to the power rail?
>>
>>Thanks
>>Ben
>>

>
>
> Another idea which I just used on a cyclone design .. i put a small
> smt led from the NCEO pin to ground via a 220 resistor, the led
> flashes when power is first applied during configuration, if the led
> remains on there is a problem. I like this particularly for multiple
> cyclones loading from one flash device since each cyclone can have
> it's own led beside the chip indicating which cyclone did not
> configure instead of using the conf_done pins because these are tied
> together for a multiple cyclone string and cannot point to the chip.
>


This sounds like a reasonable alternative solution but I would like the
indicator to come on after configuration.

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