The 3801HGV VDSL2 modem router is from the 2Wire 38xx family. 
The device runs on a TriMedia TM32 dual core processor.
The dual core TriMedia CPU is codenamed the Denali. It may also be known as the 2Wire Diablo.
The processor in this 3801HGV is actually branded as a Broadcom BCM6901, and it runs very hot!
The photos can hopefully do the talking (click a photo to enlarge):
The 2Wire 3801HGV supplied by AT&T as VDSL2 CPE for its U-Verse service
The front panel of the 3801HGV
The connectors on the rear panel of the 3801HGV
The 3801HGV PCB
The Broadcom BCM6091KPBG CPU and DDR2 SDRAM. The CPU is believed to contain a dual core TriMedia “Denali”. The SDRAM is 512Mbit (64Mbyte) of DDR2-667
Close up of the Broadcom BCM6091KPBG and the DDR2-667 SDRAM. Note also the 25MHz crystal oscillator to provide hardware clocking for the CPU
Atheros AR5005G (AR2413a) 802.11g wireless LAN chipset
Infineon ADM6996M -10/100 6 Port Ethernet Switch Controller
Zarlink Le88506DVC VoicePort VOIP Chipset
CopperGate CG3210H chipset comprising CG3213 Analog Front End and CG3211 Coax/POTS to Ethernet Bridge Controller
Not visible, the 3801HGV also has a PMC-Sierra PM4380
Analog Front End for VDSL2/ADSL2+.
Bottom face of 3801HGV PCB. The NAND flash IC shown towards the top left
close-up of the ST NAND512W3, a 512Mbit NAND flash device with a x8 bus
The familiar 1.0mm pitch edge card connector (for JTAG and i2c)
There are more PCB photos of the 3801 and a copy of the 3801 User Guide in 2Wire’s regulatory filings with the FCC  
The User Guide for the 2Wire 3801HGV can be downloaded here .