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The general configuration of the microprogrammed control unit  is given below:

What are blocks B and C in the diagram respectively?

  1. Block address register and cache memory
  2. Control address register and control memory
  3. Branch register and cache memory
  4. Control address register and random access memory
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option b is right answer

the address generated by NEXT ADDRESS GENERATOR is stored in CONTROL ADDRESS REGISTER .

Then control word stored at the address in CONTROL ADDRESS REGISTER is read from CONTROL MEMORY.

P.S:Here control address register is similar to memory address register and control memory is similar to main memory.

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