Section 8.7
Review Questions
An alternate organization
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If a design continues to work successfully even when we increase the size
of the component, we say the design ___________________.
answer...
scales up well
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Why is the CSC-1 design unable to withstand lots of new instructions?
answer...
because the connections only fit the current instruction set; they
were specially wired up for it. Changes would require a lot of new
ad hoc connections.
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Define bus as it is used in computer architecture.
answer...
a group of wires
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What does the +1 register do in the CSC-2 design?
answer...
supplies the constant binary number 1
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What type of gate is used to connect the outputs of the various registers
in the CSC-2 to the A bus and B bus?
answer...
tri-state buffers
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Why is the MBR the only register in the CSC-2 that still needs a mux to
control its input wires?
answer...
because there are two input pathways (one from the C bus and the other
from main memory)
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Besides the +1 register, which other register is new in the CSC-2 and
why is it needed?
answer...
result register; it holds the result of the ALU/shifter until the
end of the instruction