One of the key advantages of the Mixed Signal Oscilloscope, MSO is that only one unit is required for performing both oscilloscope and logic analyser based tests. When investigating logic circuits including those with FPGAs and ASICs, often the full capability of a logic analyser is not needed. Instead a combination of both scope and analyser is needed.
As such the MSO logic channels provide sufficient logic analysis for many applications, but combine this with an excellent oscilloscope to give a test instrument that is sufficient for most occasions.