A 32- bit architecture instructuction of size of four words = 4*32 =2^7= 128 bit
First half of the instruction OPCODE = 64 bit
Second half of the instruction address fireld = 64 bit.
Instruction is stored in memory with base address B
Address field contains a value A, Operand is stored at location P.
Address Mode : PC + X
P = (B + 4*32) + M[A].