When a memory-reference instruction with I = 0 is encountered, it is not necessa
ID: 3778777 • Letter: W
Question
When a memory-reference instruction with I = 0 is encountered, it is not necessary to do anything since the effective address is already in AR. However, the sequence counter SC must be incremented when D'_7T_3 = 1. TRUE [] FALSE [] A Register-reference or input-output can be executed with the clock associated with timing signal T_3. After the instruction is executed. SC is cleared to I and control returns to the fetch phase with T_0 = 0. TRUE [] FALSE [] The instruction ADD adds the content of the memory word to the value of AC. The sum is transferred into AC, the C_out is transferred to E, two timing signals arc used T_4 and T_5, and the operation decoder D_1 is also used. TRUE [] FALSE [] An Arithmetic shift left multiplies a signed binary number by 3. TRUE [] FALSE [] An Arithmetic shift right divides the number by 2 TRUE [] FALSE [] We define the direct address to be the address of the operand in a computation-type instruction or the target address in a branch type instruction. TRUE [] FALSE [] An instruction code is a group of bits that instruct the microprocessor to perform a specific operation. It is usually divided into parts, each having its own particular interpretation. The basic part of an instruction code is its operation part (operation code). TRUE [.] FALSE [] In a selective clear operation, the bit pattern in B is used to clear certain bits in A. If a bit in B is set to 0, that same position in A gets set to 1, otherwise it is unchanged. TRUE [] FALSE [] In a mask operation, the bit pattern in B is used to clear certain bits in A. If a bit in B is set to 0, that same position in A gets set to 0, otherwise it is unchanged. TRUE [] FALSE [] Register-reference instructions are recognized by the control when D_7 = 0111 and I = 0. These instructions use bits 0 through 11 of the instruction code to specify one of the 12 instructions. These 12 bits arc available in IR (0-11). TRUE [] FALSE []Explanation / Answer
1. True
2. True
3. False
4. False
5. True
6. False
7. True
8. True
9. True.
10. False