Here the Wii V2 HW architecture diagram. This wiring diagram show connection between 64MB GDDR3 RAM, A/V controller, PowerPC 750CL CPU, WiFi module, Memory/IO bridge, and others. All addresses are physical. For most addresses, add +0×8000000 for RAM or 0xC0000000 for I/O to get logical address on PPC side. Full wiring diagram here.