Stratix IV GX transceivers: 32-bit word alignment in basic mode?

Next problem:

The byte ordering block can only be used when I select a 20-bit word alignment pattern length in the Word Aligner tab (instead of the 10 bit alignment pattern I now use). However, a 20-bit pattern is not recognized as a control code, and therefore I cannot align to a 20-bit pattern (rx_patterndetect never goes high).

So eventhough I can now use the byte ordering block, it it still useless because now the byte alignment does not work anymore.

Are there standard 20-bit control codes, equivalent to the 10-bit K28.5 alignment code 0101111100 (which is BC decoded to 8 bits)?