Answered: UXSRE 16

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1.) The LD.PC controls when to write an address to the PC. During a BR instruction, what Boolean logic is used to assert LD.PC and overwrite the PC?

2.) Not all instructions that change the value of a general-purpose register (GPR) update the values of the N, Z and P registers. For what explicit type of values written to a GPR are the condition codes not updated?

3.) List all the LC-3 instructions that change a GPR, but do not update the conditional codes, N, Z, and P.

4.) Where does the FSM get the values n, z, and p to compare to N, Z, and P in the Boolean expression N.n + Z.z + P.p?

Gate.MARMUX/
Gate.PC
IRJII:
LD.PC
Y MARMUX
MUK.DR/
16
ADDR ADD
MUX.PC
ZAT(TRAPVeck)
REG
LD.REG
BUS
PCI
16 16
SR2
ZXT
ADDR ADD
ADDR ADD
OUTSRI
OUTSR2
TRAPVeck
AA MUX.ADDR2
AUNADDRI
IRIS:6|
IRI1:1
PC
16
OUTSRI
PCOfetl
SXT(Imms)
16
SXT
SXT
16
PCOfet
Imms
IRJ4:0
IRIS:0|
DMUX.SR/
SAT
IRIS0
PCOffets
116
SAT
CONTROL
ALU
ALUK
16
IR
LOGIC
7Ge ALU
Page
-
Gate. MDRA

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