Honored Contributor
Honored ContributorHi Neil,
--- Quote Start --- Ahh the old nomenclature mix up trick....Indeed I do of course want a serial stream. --- Quote End --- Ok, then the transceiver will work fine. --- Quote Start --- Since the GT transceivers only use the PMA, all the PCS encoding is bypassed, I see that. So then does the PMA add any ecoding at all? If not, then the parallel data does come out unadulterated, and I may have a dev board for my problem. --- Quote End --- You can configure the transmitter to send what you have supplied from the fabric. You can still enable transmit pre-emphasis and adjust the transmitter eye opening (I've used this in Stratix IV GT, not V, but it should be similar). --- Quote Start --- Transmitter delay will not be a problem. The modulation is for an optical link that we want to test and deserialisation will not occur, hence the reason for not wanting any encoding. Once "booted" the tx will run constantly for some arbitrary amount of time. --- Quote End --- Great, your application can deal with arbitrary delays. Take a look at the LFSR/PRBS tutorial I linked to, you can use the code that comes with it. Take a look at the Hittite ADC hardware test doc, http://www.ovro.caltech.edu/~dwh/wbsddc/hittite_adc_hw.pdf and you'll see a setup (Qsys system setup as an ADC simulator) that does exactly what you want. You can create your own Stratix V version. The design can be simulated first; create both a transmitter and receiver design and that way you can convince yourself that the link receiver will work correctly. In your hardware setup you can use a BERT tester with the same PRBS setup and it will work fine (the engineers at Hittite setup some tests like this). Cheers, Dave
