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Altera_Forum
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15 years ago

Problem with ALTGX

Hello All, I'm having a problem with ALTGX transceivers. The problem is the follow: I'm Using a transceiver that it's suppose to run at a datarate of 2.970 Gbps (3G-SDI). I'm using this trans...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Despite the fact that your serialization factor (11) sounds a bit strange (I would rather expect 20, 10, 16 or 8), I assume your firmware is OK.

In that case, You should observe an eye pattern (338ps width).

If you observe a sine wave, it sounds like:

1) the TX delivers 01010101... instead of NRZ data

2) your scope does not offer a sufficient bandwith (6GHz would be the limit, 12GHz would be fine) or is not properly configured (set a suitable display persistence notably)

Do you have any screenshot ?