Chapter 4.1, Problem 2E Solution

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1. Step 1 of 3

   Refer to Figure 4.2 of the chapter 4 of the textbook.

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2. Step 2 of 3

   The instruction is: LWI Rt, Rd(Rs)

   Its interpretation is: Reg[Rt] = Mem[Reg[Rd] + Reg[Rs]]

   • The given instruction accesses the content of the Register file and also writes to the Register file. So, the Registers block is required for these operations.

   • The instruction performs the addition of the two offset, so, for the addition purpose, ALU block is required.

   • The instruction also needs to fetch the content from the memory and write it to the register. For this purpose, Data memory block is required.

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3. Step 3 of 3

   Hence, the existing blocks that can be used with this instruction are: Registers, ALU and Data memory.

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