Hi, Stephan,
First of all, do not understand German, so I use automatic translation tools, I just understand your question briefly, that you want to connect SDRAM to Flexbus of KV5x.
The Flexbus of KV5x can only connect SRAM, Nor Flash..., it can not connect to SDRAM, because KV5x does not have SDRAM controller. As you know the SDRAM needs precharging, refreshing timing, the Flexbus can not do such thing.
In conclusion, KV5x can not connect to SDRAM.
Hope it can help you
BR
Xiangjun Rong