CS501 ASSIGNMENT 2 SOLUTION

                                       ASSIGNMENT # 2(Solution)

                                                CS501

QUESTION.1

Specify the condition for the branch instruction and the status of the PC after the branch instruction executes with a true branch condition.

Solution:

Instruction	Condition	PC status
Jump[20]	Always	PC← PC+20
Jnz r3,[33]	If R[3] ≠ 0	PC← PC+33
Jz r1,[16]	If R[1] = = 0	PC← PC+16
Jpl r5,[37]	If R[5] ≥0	PC← PC+37
Jmi r7,[40]	If R[7] < 0	PC← PC+40

Q.2

Identify the addressing modes and Register Transfer Language (RTL) description (meaning) for the given Falcon-A instructions

Solution:

Instruction	Addressing Mode	RTL description(meaning)
Load r3,[r5+27]	Displacement	R[3] ← M[R[5] +27]
Jnz r5,[15]	Relative	(If R[5] ≠ 0): PC← PC+15
Shiftl r3,r2,5	Immediate	Shift r2 left 5 times and store in r3
Add r6,r5,r7	Register	R[6] ← R[5] + R[7]
Subi r4,r3,17	Immediate	R[4] ← R[3] -17

---

By: Digital Communication

---