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Altera_Forum
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14 years ago

Configuring ADC using FPGA

I am trying to configure an ADC using an FPGA. I can read the default values from the ADC register properly, but I'm unable to write to those registers. The fpga clock is 48 MHz and serial clock ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Sorry, I overlooked the fact that it's not in the datasheet. I found it in this application note

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Ok, so that is not the problem.

I didn't read the data sheet completely. Take a look and see if there is a requirement to write a specific number of bytes, eg., write access to 16-bit register X must use 2-bytes otherwise write transactions will be ignored.

The other thing is that previous transactions may be screwing up the interface. Can you control the chip-select? If you can deassert it, then you can ensure you have reset the ADC internal logic.

Also, do you have an ADC clock? Some devices I have used will not work correctly until you *also* have the ADC clock.

Cheers,

Dave