
Introduction to Novel Microprocessor ArchitecturesIntroduction to Novel Microprocessor Architectures 53
2.5.1 SISD
These are the conventional systems that contain one CPU (uniprocessor)
and hence can accommodate one instruction stream that is executed serially;
Von Neumann computers are classifi ed as SISD systems. Therefore, they are
sequential computers, which exploit no parallelism in either the instruction
or data streams. A SISD computer can be seen as a Finite State Machine
where moving to the next instruction is a transition between states, early
CPU designs of the family 8086 with a single execution unit belong to this
category; other ...