Question: Consider the control unit of below Figure. Assume that the control memory is 24 bits wide. The control portion of the microinstruction format is divided

Consider the control unit of below Figure. Assume that the control memory is 24 bits wide. The control portion of the microinstruction format is divided into two fields. A micro-operation field of 13 bits specifies the micro-operations to be performed. An address selection field specifies a condition, based on the flags, that will cause a microinstruction branch. There are eight flags.

a. How many bits are in the address selection field?

b. How many bits are in the address field?

c. What is the size (in number of bits) of the control memory?

Figure: Branch Control Logic: Single Address Field

Address decoder Control memory Control buffer Control Address register Control address register

Address decoder Control memory Control buffer Control Address register Control address register +1 Branch Flags- Multiplexer Instruction logic register Address selection

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