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196 CHAPTER 4/LOGIC FUNCTION REPRESENTATION AND MINIMIZATION

each expansion is to be performed. Compare the best expansion result for each with
its two-level K-map minimum result.
4.37 Use BOOZER, the logic minimizer bundled with this text, to verify or compare (if ap-
plicable) the results with any of the previously stated problems. For example, Problem
4.37/4.6c would require use of BOOZER to minimize Problem 4.3c, since Problem
4.6 refers to Problem 4.3. [Hint: To obtain a minimum POS result by using BOOZER,
map the function, complement each cell of the K-map, enter the results into BOOZER
and minimize as an SOP function, and then complement the BOOZER result. Note
that either entered variables (EVs) or I's and O's can be entered into the BOOZER
algorithm — your choice.] Follow the entry protocol contained in the Readme.doc
accompanying the BOOZER software.
4.38 Repeat Problem 4.37 by using the ESPRESSO logic minimizer bundled with this text.
For example, Problem 4.38/4.19b would require the use of ESPRESSO to minimize
the function r after it has been properly expressed in minterm code form.