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- Alan Mishchenko, Tsutomu Sasao
- DAC
- 2003

In some cases, minimum Sum-Of-Products (SOP) expressions of Boolean functions can be derived by detecting decomposition and observing the functional properties such as unateness, instead of applying the classical minimization algorithms. This paper presents a systematic study of such situations and develops a divide-and-conquer algorithm for SOP… (More)

- Tsutomu Sasao, Yukihiro Iguchi, Munehiro Matsuura
- IWLS
- 2002

This paper shows four different methods to evaluate multiple-output logic functions using decision diagrams: SBDD, MTBDD, BDD for characteristic functions (CF), and BDDs for ECFNs (Encoded Characteristic Function for Non-zero outputs). Methods to compute average evaluation time for each type of decision diagrams are presented. By experimental analysis using… (More)

- Tsutomu Sasao
- IEEE Trans. Computers
- 1997

—This paper presents a design method of easily testable AND-EXOR networks. It is an improvement of Reddy and Saluja-Reddy's methods, and has the following features: 1) The network uses generalized Reed-Muller expressions (GRMs) instead of Positive Polarity Reed-Muller expressions (PPRMs). The average number of products for GRMs is less than half of that for… (More)

- Shinobu Nagayama, Tsutomu Sasao, Jon T. Butler
- ASP-DAC
- 2006

This paper presents an architecture and a synthesis method for programmable numerical function generators (NFGs) for trigonometric, logarithmic, square root, and reciprocal functions. Our NFG partitions a given domain of the function into non-uniform segments using an LUT cascade, and approximates the given function by a quadratic polynomial for each… (More)

A realization of multiple-output logic functions using a RAM and a sequencer is presented. First, a multiple-output function is represented by an encoded characteristic function for non-zeros (ECFN). Then, it is represented by a cascade of look-up tables (LUTs). And finally, the cascade is simulated by a RAM and a sequencer. Multiple-output functions for… (More)

- Tsutomu Sasao, Shinobu Nagayama, Jon T. Butler
- IEEE Trans. Computers
- 2007

—This paper proposes an architecture and a synthesis method for high-speed computation of fixed-point numerical functions such as trigonometric, logarithmic, sigmoidal, square root, and combinations of these functions. Our architecture is based on the lookup table (LUT) cascade, which results in a significant reduction in circuit complexity compared to… (More)

- Tsutomu Sasao, Jon T. Butler
- ISMVL
- 1994

- Tsutomu Sasao
- ISMVL
- 1997

This paper surveys seven types of TDDs: General TDD, SOP TDD, ESOP TDD, AND TDD, prime TDD, EXOR TDD, and Kleene TDD. We give new denitions for SOP TDDs and ESOP TDDs and introduce unifying terminology. After showing some theore m s o n c omplexities, we compare the sizes of these TDDs using benchmark functions. Finally, we review important works on TDDs.

- Tsutomu Sasao, Shinobu Nagayama
- ISMVL
- 2006

This paper considers representations for elementary functions such as polynomial, trigonometric, logarithmic, square root, and reciprocal functions. These real valued functions are converted into integer functions by using fixed-point representation, and they are represented by using binary moment diagrams (BMDs). Elementary functions are represented… (More)