It doesn't answer your question, but this Rohm part (BU29504KV) has a useful datasheet that will probably have a lot of similarity to the Marvell part:
http://www.farnell.com/datasheets/46182.pdfThis manual shows an adapter (with configuration jumpers) based on the 88i8030 chip:
http://www.bvg-group.ru/rus/download/sa ... manual.pdfIt is intended for connecting a SATA peripheral to an IDE host.
There are jumpers for selecting Master/Slave mode and jumpers for 100/133/150 MB/s UDMA modes.
T2-T7 appear to be configuration resistors for various functions, probably similar to those in the Rohm datasheet. The pinouts look very similar.
ISTM that it shouldn't be too difficult to convert such an adapter to bidirectional mode, nor should it be too difficult to work out the undocumented jumpering.