The plus (+) indicates a more advanced problem and the asterisk (*) indicates that a solut...

The plus (+) indicates a more advanced problem and the asterisk (*) indicates that a solution is available on the Companion Website for the text.

*Repeat Problem 1 for the following CISC instructions.

(a) Add with carry: R[DR] d R[SA] + R[SB] + C

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(b) Subtract with borrow: R[DR] d R[SA] − R[SB] − B

Borrow B is defined as the complement of the carry out, C.

Problem 1

Repeat Problem 2 for the following CISC instructions that are specified by register transfer statements.

(a) Push: R[SA] d R[SA] + 1 followed by M[R[SA]] d R[SB]. Assume DR=SA.

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(b) Pop: R[DR] d M[R[SA]] followed by R[SA] d R[SA] − 1. Assume SB=SA.

Problem

Write microcode for the execution part of each of the following CISC instructions. Give both a register transfer description and binary or hexadecimal representations similar to those shown in Table for the binary code for each microinstruction.

Table Example Micro programs for CISC Architecture

(a) Branch if overflow

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(b) Branch if greater than zero

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(c) Compare less than