SOPC Builder Component Editor in Quartus II 10.1

This field describes what type of reset synchronization the component requires.

None = component does it's own internal reset synchronization so the tools won't bother doing this for you

Deassert = component requires that the incoming reset be asserted asynchronously and deasserted synchronously.

Both = component requires that the reset be asserted and deasserted synchronously.

So historically SOPC Builder always assumed "Deassert" where all the resets would get bundled together, synchronized per clock domain, and each synchronized reset sent throughout the system on a per clock domain basis. Components were always asynchronously reset and were brought out of reset synchronously (Deassert).