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H.W: Let register A = 1101 1001, determine the B operand and the logic micro-operation to be performed in order to change the value in A to: a) 0110 1101 b) 1111 1101

H.W: Let register A = 1101 1001, determine the B operand and the logic micro-operation to be performed in order to change the value in A to: a) 0110 1101 b) 1111 1101

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Let A be a processor register and Ba register that hold a logic operand by which we can change reg. A, then we can have: 1- The selective-set operation: sets to 1 the bits in A where they are corresponding 1's in B Ex. : let A = 1010 and we want to set the left two bits into l's, such that A will be = 1110. Sol.: we use the B operand = 1100 together with OR logic operation: 1010 A before 1100 B (logic operand) ---------- 1110 A after : A+AvB In assembly: OR AX , BX 2- The selective-complement operation: complements bits in A where they are corresponding l's in B. Ex. : let A = 1010 and we want to complement the left two bits. such that A will be = 0110. Sol. : we use the B operand = 1100 together with X-OR logic operation, because x 00 = x and x O1 = x': 1010 A before 1100 B (logic operand) ---- - 0110 A after; A+AOB In assembly : XOR AX, BX 3- The mask operation: clears to zero the bits in A where they are corresponding O's in B. Ex. : let A = 1010 and we want to clear the left two bits , such that A will be = 0010 Sol.: we use the B operand = 0011 together with AND operation: 1010 A before 0011 B (logic operand) 0010 A after; AAAB In assembly : AND AX , BX The insert operation: inserts a new value into a part of register . This is done by first masking (ANDing ) the unwanted bits and then ORing them with the required value. Ex. : let A = 0110 1010, replace the most left four bits by the value 1001 such that A will be = i001 1010. Sol.: 01101010 A before 00001111 B (mask) ------------ - 00001010 A after masking : A+AA B 00001010 A before 10010000 B (insert) --------------- 10011010 A after insertion; AAVB 5- The clear (compare) operation: compares the words in A and B and produces an all O's result if the two numbers are equal .This can achieved by using E-OR operation. ex. : 1010 A 1010 B ------ 0000 ; A+ AOB H.W: Let register A = 1101 1001, determine the B operand and the logic micro-operation to be performed in order to change the value in A to: a) 0110 1101 b) 1111 1101
Transcribed Image Text:Let A be a processor register and Ba register that hold a logic operand by which we can change reg. A, then we can have: 1- The selective-set operation: sets to 1 the bits in A where they are corresponding 1's in B Ex. : let A = 1010 and we want to set the left two bits into l's, such that A will be = 1110. Sol.: we use the B operand = 1100 together with OR logic operation: 1010 A before 1100 B (logic operand) ---------- 1110 A after : A+AvB In assembly: OR AX , BX 2- The selective-complement operation: complements bits in A where they are corresponding l's in B. Ex. : let A = 1010 and we want to complement the left two bits. such that A will be = 0110. Sol. : we use the B operand = 1100 together with X-OR logic operation, because x 00 = x and x O1 = x': 1010 A before 1100 B (logic operand) ---- - 0110 A after; A+AOB In assembly : XOR AX, BX 3- The mask operation: clears to zero the bits in A where they are corresponding O's in B. Ex. : let A = 1010 and we want to clear the left two bits , such that A will be = 0010 Sol.: we use the B operand = 0011 together with AND operation: 1010 A before 0011 B (logic operand) 0010 A after; AAAB In assembly : AND AX , BX The insert operation: inserts a new value into a part of register . This is done by first masking (ANDing ) the unwanted bits and then ORing them with the required value. Ex. : let A = 0110 1010, replace the most left four bits by the value 1001 such that A will be = i001 1010. Sol.: 01101010 A before 00001111 B (mask) ------------ - 00001010 A after masking : A+AA B 00001010 A before 10010000 B (insert) --------------- 10011010 A after insertion; AAVB 5- The clear (compare) operation: compares the words in A and B and produces an all O's result if the two numbers are equal .This can achieved by using E-OR operation. ex. : 1010 A 1010 B ------ 0000 ; A+ AOB H.W: Let register A = 1101 1001, determine the B operand and the logic micro-operation to be performed in order to change the value in A to: a) 0110 1101 b) 1111 1101
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