MSD7818

CORE	MIPS34K (or MIPS 4Kf)
Clock	Target speed 550MHz
Package	LQFP128
Memory	DDR2-1066MHz

Pinout

Sources

Some source code

Another source code, someway related to MStar boards (may be useful)

MStar MSD7818 - DVB-T receiver schematics (DH1687 board)