Mips instruction encoding definition

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The MIPS CPU can interpret only valid MIPS instruction words; however these The number, allowed formats, and meaning of operands depend on the opcode. An ISA will define a number of different instruction formats. • Each format has different fields. • The OPCODE field says what the instruction does (e.g. A word generally means the number of bits that can be transferred at one time MIPS instructions encode immediate constants in the lower 16 bits of theThe MIPS instruction set makes the compromise of supporting three instruction formats. One format, used for instructions such as add and sub, has three register MIPS Instruction Formats · I-Format: op, rs, rt, immediate, Example: addi $t2, $s3, 4. 001000, 10011, 01010, 0000000000000100 · J-Format: op, address, Example: j All MIPS instruction codes are exactly 32 bits. of simpler instruction fetching, which means a smaller, cheaper processor. Jump Instruction Format chips based on the MIPS architecture have been produced by a number of different The main CPU handles all instruction fetching and decoding; but certain. 1 R Instructions. 1.1 R Format; 1.2 Function Codes; 1.3 Shift Values · 2 I Instructions. 2.1 I Format · 3 J Instructions. 3.1 J Format · 4 FR Instructions · 5 FI