Consider the following pseudo assembly code for computing c = a + b. Assume that a, b, and c are assigned to consecutive memory words (memory is generally addressed byte by byte and assume that a word is 4 bytes), and address for a is 0x0000e308. Also, we have a = 20, b = 136, and c = 0 at the starting time. Assume that the first instruction of the code is stored in 0x00001018. Also, each instruction has the opcode in the first byte (most significant byte) and the remaining 3 bytes specify the corresponding address. The opcode for load is 1, store is 2, and add is 3.

load a

add b

store c

(a) Show the memory addresses and contents for all the instructions and data involved. Use the format as follows to express your answer (but the following is not the answer). For all data, use hexadecimal representation.

addresses contents

0x00002104 0x00000001

0x00002108 0x00000002

b) Write the micro instructions for the code segment. Assume that the current PC (program counter) is 0x00001018. For each micro-instruction, also indicate the data that is transferred (if it is memory access). For all data, use the hexadecimal representation. The following are the first two micro-instructions and the data transferred. Complete the rest.

Micro-instructions data

PC -> MAR 0x00001018

M -> MBR 0x0100e308