Instruction set
It looks like instructions are 8 bytes long. Roughly speaking - first 4 bytes contain opcode and addressing mode. Second 4 bytes contain operands encoding.
0x00000000 - 0x08000000
0x08000000 - 0x10000000
0x10000000 - 0x18000000
0x18000000 - 0x20000000
0x20000000 - 0x28000000
0x28000000 - 0x30000000
0x30000000 - 0x38000000
0x38000000 - 0x40000000
0x40000000 - 0x48000000
0x48000000 - 0x50000000
0x50000000 - 0x58000000
0x58000000 - 0x60000000
0x60000000 - 0x68000000
0x68000000 - 0x70000000
0x70000000 - 0x78000000
0x78000000 - 0x80000000
0x80000000 - 0x88000000
0x88000000 - 0x90000000
0x90000000 - 0x98000000
0x98000000 - 0xA0000000
0xA0000000 - 0xA8000000
0xA8000000 - 0xB0000000
0xB0000000 - 0xB8000000
0xB8000000 - 0xC0000000
0xC0000000 - 0xC8000000
0xC8000000 - 0xD0000000
0xD0000000 - 0xD8000000
0xD8000000 - 0xE0000000
0xE0000000 - 0xE8000000
0xE8000000 - 0xF0000000
0xF0000000 - 0xF8000000
0xF8000000 - 0xFF000000
0xFF000000 - 0xFFFFFFFF