R-Type instruction:
- All the data values used by the instruction are located in registers that time R instruction is used.
- R-type instruction is used by the register-to-register arithmetic (add, sub, and so on).
op | rs | rt | rd | shamt | func |
6 bits 5 bits 5 bits 5 bits 5 bits 6 bits
Where,
op – it is an opcode used to selects a particular operation.
rs and rt – are the first and second source registers.
rd – it is the destination register.
shamt – it is only used for shift instruction.
func – it is used together with “op” to choose an arithmetic instruction.
I-Type instruction:
- When the instruction must operates on a register value and an immediate value that time I instruction is used.
- I-type instruction is used by the load, store, branch and immediate instructions.
op | rs | rt | address |
6 bits 5 bits 5 bits 16 bits
Where,
op – it is an opcode used to selects a particular operation.
rs and rt – are the first and second source registers.
address – it is a 16 bits signed 2’s complement value.
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Computer Organization and Design MIPS Edition, Fifth Edition: The Hardware/Software Interface (The Morgan Kaufmann Series in Computer Architecture and Design)
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