Generate a CONVST signal to ADS8556 using a GPIO pin from C6713

Hi,

I am using a precision ADC ADS8556 (TI's document SBAS404A) on my board
interfaced to a C6713 DSP through a McASP.

I have the GPIO5/EXT_INT5 pin of the DSP connected to the CONVST_x pins of
the ADS8556.

The CONVST_x pin has to be synchronized with the Frame-sync from the McASP.
(please look at page 14 of SBAS404A ADC datasheet for the serial interface
timing).

Can I synchronize the GPIO with the McASP framesync and generate the
required signal?

Thanks
Aditi Start a New Thread

Aditi-

> I am using a precision ADC ADS8556 (TI's document SBAS404A) on my board
> interfaced to a C6713 DSP through a McASP.
>
> I have the GPIO5/EXT_INT5 pin of the DSP connected to the CONVST_x pins of
> the ADS8556.
>
> The CONVST_x pin has to be synchronized with the Frame-sync from the McASP.
> (please look at page 14 of SBAS404A ADC datasheet for the serial interface
> timing).
>
> Can I synchronize the GPIO with the McASP framesync and generate the
> required signal?

I might be missing something tere, but why not connect the McASP framesync to the CONVST_x pins, or run through an
inverter? Is there some reason why you "can't touch" the board?

Embedded engineering is always about combined software + hardware. Trying to find a software fix for every hardware
problem can lead to code that is confusing, too complex to be reliable (has very touchy timing), can't be maintained
over time, etc.

-Jeff

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