Datapath: memory access (load)

1. Fetch instruction and increment PC

Fig. 5.21

2. Obtain base register operand (Read data 1) from register file

3. Perform addition of register value with sign-extended immediate operand in ALU,

using ALU control to select operation, ALUSrc = 1 to select immediate

4. Use ALU result as address for data memory

5. Use MemtoReg = 1 to select Read data and write back to destination register

Controls: RegWrite = 1, RegDst = 0 for $rt

How would this have to change for a store instruction?