CS501 Assignment No.2 2020

CS501 Assignment No.2 2020

Question No. 01    10 Marks

Write an RTL description for each of the below given Falcon-A instructions.

Solution:

Instruction RTL Description

JNZ R1, [25] (R[1]≠0): PC←PC+25

SHIFTR R3, R2, 5 R[3]←(5α0)©(R[2]<15…4)

LOAD R4, [R1 + 20] R[4] ← M[20+R[1]]

CALL R6, Ah R[6] ←PC, PC← Ah

MUL R2, R3, R1 R[2] ← R[3]*R[1]R[0] ←C

Note: You must use a sign-extended the constant in the instructions wherever needed.

Question No. 02    10 Marks

Consider the below-given tables. Table 1 shows the contents stored at different memory addresses. Table 2 shows the contents stored in different registers. 

Memory Address Memory Contents Register Register Contents

1530h 45h R[0] AB04h

1531h 90h R[1] 2010h

AB20h 66h R[2] 1520h

AB21h 02h R[3] 0230h

Table 1: Memory Contents Table2: Register Contents

What will the contents of the address bus and data bus after each of the instructions be executed?

1. LOAD R1, [R0+28]

2. STORE R3, [R2+16]

Solution:

Instruction Address Bus Data Bus

LOAD R1, [R0+28] AB20h 6602h

STORE R3, [R2+16] 1530h 4590h