Hi,
I read from the SNAP wiki page that we can operate the SNAP board ADCs at
1GSps with 3 channels of input. So, I modified the CASPER SNAP tutorial 3
to make the ADC work at 1GSps to obtain a 1 channel spectrometer with a
spectrum of 500 MHz. First I modified the SNAP User IP Clock Rate to 250
MHz, then changed the snap_adc Sample Rate to 1000 MHz.
Then I modified the script to obtain a 500 MHz spectrum and the ADC
initialization is done with
adc.init(samplingRate=1000, numChannel=1, resolution=8)
No compilation problem with the toolflow. The script worked the first time
when I ran it. ADC initialization was fine and I got my 500 MHz spectrum.
However, when I ran the script a second time, the ADC initialization failed
with the following messages:
ERROR:root:Frame clock NOT aligned.
{0: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0, 7: 0}, 1: {0: 128, 1: 128,
2: 128, 3: 128, 4: 128, 5: 128, 6: 128, 7: 128}, 2: {0: 0, 1: 0, 2: 0, 3:
0, 4: 0, 5: 0, 6: 0, 7: 0}}
ERROR:root:Line clock NOT aligned.
{0: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0, 7: 0}, 1: {0: 39, 1: 39, 2:
39, 3: 39, 4: 39, 5: 39, 6: 40, 7: 39}, 2: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0,
5: 0, 6: 0, 7: 0}}
ERROR:root:ADC1 lane0 delay decision failed
ERROR:root:ADC1 lane1 delay decision failed
ERROR:root:ADC1 lane2 delay decision failed
ERROR:root:ADC1 lane3 delay decision failed
ERROR:root:ADC1 lane4 delay decision failed
ERROR:root:ADC1 lane5 delay decision failed
ERROR:root:ADC1 lane6 delay decision failed
ERROR:root:ADC1 lane7 delay decision failed
ERROR:root:Line clock NOT aligned.
{0: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0, 7: 0}, 1: {0: 78, 1: 78, 2:
78, 3: 78, 4: 79, 5: 78, 6: 79, 7: 78}, 2: {0: 0, 1: 0, 2: 0, 3: 0, 4: 0,
5: 0, 6: 0, 7: 0}}
ERROR:root:ADC1 lane0 delay decision failed
ERROR:root:ADC1 lane1 delay decision failed
ERROR:root:ADC1 lane2 delay decision failed
ERROR:root:ADC1 lane3 delay decision failed
ERROR:root:ADC1 lane4 delay decision failed
ERROR:root:ADC1 lane5 delay decision failed
ERROR:root:ADC1 lane6 delay decision failed
...
I have seen these before with the 800 MSps, but ADC initialization would
eventually work at the second attempt, whereas 1 GSps, it fails. I have
increased the number of attempts in calling adc.init( ), but it fails time
and time again. I also power cycled the board and tried again, but it still
fails. The strange thing is that it worked the very first time I ran the
script, but failed every single time after this.
Is there a way to make 1 GSps work reliably over several re-programming
stages and across reboots.
Regards,
Nitish
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