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HIEE400103R0001 Controllers are divided into combinational logic controllers and microprogrammed controllers. Both controllers have their own strengths and weaknesses.
HIEE400103R0001 The combinational logic controller is troublesome to design and has a complex structure. Once the design is completed, it cannot be modified or expanded, but it is fast.
HIEE400103R0001 Microprogrammed controllers are easy to design, simple in structure, and easy to modify or expand. To modify the function of a machine instruction, you only need to reprogram the corresponding microprogram; to add a machine instruction, you only need to add a microprogram in the control memory. However, it does so by executing a mini-routine.
HIEE400103R0001 The specific comparison is as follows: Combinational logic controllers, also known as hard-wired controllers, are composed of logic circuits and rely entirely on hardware to implement instruction functions.
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