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What cold you said about the memory of the DE0nano in terms of amount of data that can be stored in terms of micro seconds? i.e can I record data up to 6.4935e-05 seconds?
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According to the Terasic page for the DE0-nano, there is 32MB SDRAM. Assuming you can write to the SDRAM at the same rate as your ADC, you can store 32MB of data. If you ADC is 16-bits, then you can store 16M-samples. The total time that 16M-samples corresponds to depends on your sampling frequency.
The first thing you need to figure out is how fast can the SDRAM be written to on the DE0-nano. Check out the Terasic design examples, they should have one that uses the SDRAM.
Cheers,
Dave
Honored Contributor
