Stratix II and M4K true dual port memory

There are two address ports going into both RAMs. In simple dual-port, one can read and the other can write. In true dual-port, they can both read and write. I'm surprised it needs true dual-port, but don't know what it's doing. (Note that if the true dual-port needs a single write address and two reads, this can effectively be done by using two simple dual-port RAMs. This may not be easy to do via DSP builder though.)