Computer Organization and Architecture (Solved Answers from QBank - XIII) - Tirthankar Pal - MBA from IIT Kharagpur, GATE, GMAT, IIT Written Test, Interview were a part of MBA Entrance, B.S. in Computer Science from NIELIT

Micro Instructions Sequencer

Micro Instructions Sequencer is a combination of all hardware for selecting the next micro-instruction address. The micro-instruction in control memory contains a set of bits to initiate micro operations in computer registers and other bits to specify the method by which the address is obtained.

Implementation of Micro Instructions Sequencer –

• Control Address Register(CAR) :
  Control address register receives the address from four different paths. For receiving the addresses from four different paths, Multiplexer is used.
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• Multiplexer :
  Multiplexer is a combinational circuit which contains many data inputs and single data output depending on control or select inputs.




• Branching :
  Branching is achieved by specifying the branch address in one of the fields of the micro instruction. Conditional branching is obtained by using part of the micro-instruction to select a specific status bit in order to determine its condition.




• Mapping Logic :
  An external address is transferred into control memory via a mapping logic circuit.




• Incrementer :
  Incrementer increments the content of the control address register by one, to select the next micro-instruction in sequence.




• Subroutine Register (SBR) :
  The return address for a subroutine is stored in a special register called Subroutine Register whose value is then used when the micro-program wishes to return from the subroutine.




• Control Memory :
  Control memory is a type of memory which contains addressable storage registers. Data is temporarily stored in control memory. Control memory can be accessed quicker than main memory.

Tirthankar Pal
MBA from IIT Kharagpur with GATE, GMAT, IIT Kharagpur Written Test, and Interview
2 year PGDM (E-Business) from Welingkar, Mumbai
4 years of Bachelor of Science (Hons) in Computer Science from the National Institute of Electronics and Information Technology
Google and Hubspot Certification
Brain Bench Certification in C++, VC++, Data Structure and Project Management
10 years of Experience in Software Development out of that 6 years 8 months in Wipro
Selected in Six World Class UK Universities:-
King's College London, Durham University, University of Exeter, University of Sheffield, University of Newcastle, University of Leeds