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Previous Year Question (PYQs)
A micro instruction format has microoperation field which is divided into $2$ subfields $F1$ and $F2$, each having $15$ distinct microoperations, condition field $CD$ for four status bits, branch field $BR$ having four options used in conjunction with address field $AD$. The address space is of $128$ memory words. The size of micro instruction is:
Solution
Each subfield $F1$ and $F2$ has $15$ microoperations.
To represent $15$ operations, we need:
$\lceil \log_2 15 \rceil=4$ bits
So,
$F1=4$ bits
$F2=4$ bits
Condition field $CD$ has $4$ options/status bits:
$\log_2 4=2$ bits
Branch field $BR$ has $4$ options:
$\log_2 4=2$ bits
Address space is $128$ memory words:
$\log_2 128=7$ bits
Total size of microinstruction:
$4+4+2+2+7=19$ bits
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