Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
Announcements
Need Forum Guidance? Click here

Search our FPGA Knowledge Articles here.
19095 Discussions

MAX10 output driver behaviour

Tho_Ge
Beginner
284 Views

We had an external ADC connected to a MAX10 (10M50). To investigate the signal integrity of the signals between the MAX10 and ADC, eye diagrams of various signals were recorded. We noticed a bit strange behavior with the output driver of the MAX10.
The output signal (output strength set to LVCMOS 2mA) of the MAX10 is shown in the picture TC73_02_ADC_clock_amp_1_2.png. What we noticed are the levels in the output signal of the MAX10. Whereas the output signal of the external ADC (picture TC73_02_ADC_SDOA_amp_1_2.png) looks as expected.

Is there an explanation for these levels in the output signal (rising and falling edge) of the MAX10 driver

0 Kudos
6 Replies
Ash_R_Intel
Employee
273 Views

Hi,

The images are missing. Can you please attach them?


Regards.


Tho_Ge
Beginner
270 Views

Sorry,

 

here they are, hopefully

Ash_R_Intel
Employee
253 Views

I am little confused on the query here. You said, an external ADC was connected to MAX 10. So, ADC output is becomes an input to MAX 10, right? Are you checking at the MAX 10 input pin?


Tho_Ge
Beginner
248 Views

Sorry for my imprecise wording.

The picture "TC73_02_ADC_clock_amp_1_2.png" shows an output of the MAX10, here the clock signal to the ADC (input signal for ADC), with the mentioned levels in the signal curve.
For comparison, "TC73_02_ADC_SDOA_amp_1_2.png" shows the output signal of the ADC (input signal for MAX10), which has no levels in the output signals.
These levels in the output of the MAX10 have been observed on many of the recorded eye diagrams.

Ash_R_Intel
Employee
64 Views

Looks like this thread was left unattended. Sorry about that. Not sure, if you still need the support, but putting my thoughts here.

As the output is LVCMOS, there could be a chance that the signal strength is not enough. You can try increasing the strength.

 

Regards

 

Ash_R_Intel
Employee
49 Views

This thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you


Reply