64-bit SODIMM module on 32-bit SDRAM-controller?

Hello,

how do I connect a 64-bit wide SODIMM-SDRAM-module to a 32-bit
SDRAM-controller?

I saw different ways in the web (from connecting the upper and lower
32-bit together on the pcb and making the selection with the 8 dqm
lines to very strange connections of the address lines to the dqm pins
and different chip select) but have no idea which one is really
working and the best way.
I am currently totally free because the schematics are at the
beginning.

Best Regards,

Marc