2.4e S-Type

S-Type Instruction

The S-type (store) format (opcode 010 0011) is designed for storing instructions and involves a lesser, 12-bit immediate. It follows the format:

31-25	24-20	19-15	14-12	11-7	6-0
imm[11:5]	rs2	rs1	funct3	imm[4:0]	opcode

where the immediate is split up between imm[11:5] and imm[4:0] to keep rs1 ad rs2 at the same place as the R-type and efficiently use the same hardware for obtaining the registers.