Multiple choice

The microinstructions stored in the control memory of a processor have a width of 26 bits. Each microinstruction is divided into three fields: a micro-operation field of 13 bits, a next address field (X), and a MUX select field (Y). There are 8 status bits in the inputs of the MUX.

How many bits are there in the X and Y fields, and what is the size of the control memory in number of words?

  1. 10, 3, 1024

  2. 8, 5, 256

  3. 5, 8, 2048

  4. 10, 3, 512
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