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Altera_Forum's avatar
Altera_Forum
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10 years ago

Received waveform frequency is way too low than it was sent

I am using Quartus 12.1 sp1, vhdl and Altera Nios II programmed in C code for DE0-Nano Development. Basically, what I have is, data is sent from fpga vhdl block to NIos II system, Nios II system send...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

You have many variables in your setup:

1) nios runs at known speed but your tone frequency depends on instructions (nios is no good as NCO) so your frequency at generation is unknown

2) buffering adds further time uncertainty

3) plotter needs to be scaled correctly but I don't think you can

so with your given info it is not doable.