Total micro-operation = 256*16
These micro-operation have to be stored in Control Memory.
Number of bits are required to address one of the micro-operation (micro-instruction) = log(256*16)=12 bits
Control Word Format Includes :
Flags bits(4) + Control signals bits(6) + Next Micro operation address bits (12) = 22 bits
More Over, Control Memory Size = 2^12 * 22 bits