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Summary: Decidable and Undecidable Problems in Systolic Circuit Verification 1
Parosh Abdulla
Department of Computer Systems
Uppsala University
Box 520
S 751 20 Uppsala
Sweden
Abstract
We present a decision method for automatic verification of a nontrivial class of systolic
circuits. A formal model for systolic circuits, and a formal definition of systolic circuit
verification are provided. Using this model, we give a decision method for verification of a
class of circuits, in which the cell operations of the circuits are regarded as uninterpreted
function symbols. If a circuit is verified in this manner then the circuit is correctly im
plemented with respect to its specification regardless of the particular interpretation of
the cell operations. Finally we show that simple generalizations of the class lead to un
decidable verification problems. Examples of circuits which can be verified automatically
by our method include circuits for: convolution algorithms, matrix operations (such as
matrix multiplication and transposition), string comparisons (such as substring detection,
approximate string matching, and palindrome recognition), and implementation of digital
filters.
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