So after some research, I figured out the basics of how the DMHD-1000 radio is designed. From the antenna input - the AM/FM signal is filtered and tuned-in by a Philips microcontroller and the in-band digital FM signal is repeated to a TI IF decoder. The AM/FM/IB-FM signals are all MUXed into a TI baseband controller (BGA) - The baseband controller also formats the GUI for the LCD (channel/band/RDS info) and translates I2C bus I/O from the remote and the other decode/controller chips on the bus. Now all I need is a data sheet or reference design manual for the TI baseband chip so I can put a scope on the pins that have the desired SYNC, SDATA, SCLK and MCLK signals. Mitch has informed me the MCLK is probably different than that of an XMDIRECT. Does anyone have access to the Texas Instruments TMS320DRI300/350 datasheet with signal information?