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Lecture 6
Block
Diagrams
Let's
have a look at some block diagrams.
Introduction
System
Block Diagram
CPU
Block Diagram
Introduction
A
block diagram is a representation of part of a computer system. Block
diagrams can be simple or complex. A simple diagram might show the major
components of a computer system. A more complex diagram might show the
internal architecture of a CPU.
System Block Diagram
The
diagram below shows a block diagram of a typical micro computer system.
Examine
the diagram. Can you determine from the direction of the arrows which
line is the control bus, which line is the address bus and which line is the
data bus? Perhaps you should consider the following points:-
-
ROM
is read-only memory:-
-
data
can be retrieved from ROM along the data bus but cannot be sent to ROM
along the data bus.
-
control
signals need to be sent to ROM
-
to
locate data in ROM, an address need to be sent along the address bus
-
RAM
is read-write memory:-
-
data
can be written to and retrieved from RAM along the data bus.
-
control
signals need to be sent to RAM
-
to
locate data in ROM, an address need to be sent along the address bus
-
PIO
is an interface to devices attached to the system:-
-
data
can be written to and retrieved from the PIO.
-
control
signals need to be sent to RAM
-
to
locate data, an address need to be sent along the address bus
CPU Block Diagram
The
diagram below shows a block diagram of a typical CPU. If you want to know how
the CPU functions in more detail, read this.
The
first diagram is much more complex than the second. We can probably
simplify the second diagram even more.
That is folks!!
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