The contents of the firmware indicate it has a Lantiq VRX200 series chip (can't really tell which exact chip).
VDSL firmware version: 05.08.01.05.00.07
ADSL firmware version: 05.08.00.09.00.01
Those are slightly higher DSL firmware versions than I've seen anywhere else.
Edit: The Netgear GPL source code for the DM200 says it is the VRX220 chip (which I think is slightly more recent than the VRX268 in the ECI modems and BT HH 5a).