Assume that the control memory is 24 bits wide. The control portion of the micro
ID: 3647713 • Letter: A
Question
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, which 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 of the control memory?
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, which 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 of the control memory?Explanation / Answer
a. Three bits are needed to specify one of 8 flags. b. 24 – 13 – 3 = 8 c. 28 = 256 words X 24 bits = 6144 bits.
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