MIPS J-Type Instruction

Abstract

---

+--------+---------------------------+
| Opcode |         Address           |
| 6 bits |         26 bits           |
+--------+---------------------------+

• Instruction that tells CPU jump to Memory Address & execute Instruction starting from that point
• 2 sections - Opcode which is always 000010, Memory Address
• Supports if-else and loops
• Label here refers to the partial target address

Jump to any address within the same 256 MB region as the current PC

Since the MIPS j-type instruction can only store a 26-bit address, we construct the full 32-bit target address by taking the upper 4 bits from the current program counter, appending the 26-bit immediate from the instruction, and adding two 0 bits at the end. We ignore the last 2 bits because MIPS instructions are word-aligned, allowing us to address 256 MB within the same region of the PC.