PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 12, Problem 19RQ
Program Plan Intro
BSL instruction:
- BSL is the abbreviation for Bit Shift Left.
- BSL shifts the bit status from a lower address number to a higher address number.
- First it loads the data into an array, then shifts the data pattern through the array to the left, and finally unloads the last bit of data in the array.
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Explain the operation of POP CX instruction.
(d) The table below shows the ALUcontrol signal of the datapath we discussed in class.
Instruction
Funct
ALU
Орсode
ALUop
ALU action
operation
field
control
Iw
00
load word
XXXXXX
add
0010
Sw
00
store word
XXXXXX
add
0010
beq
01
branch equal
subtract
0110
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R-type
10
add
100000
add
0010
R-type
10
subtract
100010
subtract
0110
R-type
10
AND
100100
AND
0000
R-type
10
OR
100101
OR
0001
R-type
10
set on less than
101010
set on less than
0111
You want to add the bne instruction into the datapath, which already includes the
required hardware for the instruction. Write out the ALUop for bne and how you can
determine whether the bne results in the branch to be taken.
Instruction CLD belongs to Implied addressing and it sets the Carry Flag to one.
Select one:
True
False
Chapter 12 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
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