Question

Describe the ISA memory format?

Answer 1

Solution:

op(6 bits)

rs(5 bits)

rt(5 bits)

rd(5 bits)

shamt (5 bits)

funct(6 bits)

                                                       ( R)

op(6 bits)

rs(5 bits)

rt(5 bits)

address/immediate(16 bits)

                                                       (I)

op(6 bits)

target address(26 bits)

                                                      (J)

The fields in the frame are listed below:

=>op: opcode field

=>rs: source operand register (first)

=>rt: source operand register (second)

=>rd: destination operand register

=>shamt: the amount by which needs to be shifted

=>funct: function code

=>address: offset for load/store instructions

=>immediate: immediate instructions constants.