+Don’t care conditions
Grouping 1’s → Sum of minterms
Grouping 0’s → Product of maxterms
For SoM, all ‘1’s must be grouped, each group can have 2x ‘1’s.
To check correct loops, looping 2x elements eliminates x variables.
Loops can wrap around perimeter, and the 4 corners can be looped together too.
Don’t-cares (marked with X’s) can be treated as 1 or 0.
SSI: <12, MSI: 12-99, LSI: 100-9999
Active-high: asserted when logic 1
Active-low: asserted when logic 0