Cyclone V Transceiver Synchronised 32bit Word Alignment Problem

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Yeah the SignalTap capture is a little too small to read.

Can we conclude then from your testing and the work I did originally that to resolve this issue you have to toggle the rx_enapatternalign input after synchronisation to get the dword alignment to work correctly?

If this is the case then the transceiver user guide is really weak in divulging this information.

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Yes, I agree with you.

The doc states:

in manual alignment mode, the word aligner starts looking for the programmed 8-bit,

16-bit, or 32-bit word alignment pattern in the received data stream as soon as

rx_digitalreset is de-asserted low. it aligns to the first word alignment pattern

received regardless of the logic level driven on the rx_enapatternalign signal. any

word alignment pattern received thereafter in a different word boundary does not

cause the word aligner to re-align to this new word boundary. after the initial word

alignment following de-assertion of the rx_digitalreset signal, if a word

re-alignment is required, you must use the rx_enapatternalign signal.

That suggests that after rx_digitalreset is asserted it would look for the first word allignment pattern..

However, my method works all the time...

I would like to know how to upload a better picture. The forum seems to resize it to an idiot thumbnail...

regards