Appeal No. 1997-1637
Application 08/432,270
A logic simulator for simulating a logic circuit defined by a
plurality of sentences, each sentence being identified by an
identifier and comprising at least one operator and at least two
variables which are operated on according to said at least one
operator, said logic simulator comprising:
an identifier memory for memorizing a plurality of
identifiers each specifying one of said sentences, respectively;
a model memory for memorizing a plurality of operators which
carry out operations specified by said sentences;
a variable memory for memorizing a plurality of initial
values of the variables specified by said sentences;
a flag memory for memorizing a plurality of flags in
correspondence with said sentences, each of said flags being
indicative of whether or not said initial values of the variables
specified by each of said sentences are changed during said
simulation of said sentences;
a sentence calculating means connected to said identifier
memory, said model memory, said variable memory, and said flag
memory for carrying out calculation on one of said sentences at a
time only when a change is indicated by one of said flags that
corresponds to said one of said sentences, said sentence
calculating means producing a result of said calculation based on
at least one of said operators and at least two of said initial
values of said variable, said at least one of said operators and
said at least two of said initial values of said variables being
specified by said one of said sentences;
a result memory for memorizing an initial result value; and
substituting means connected to said result memory and said
sentence calculating means for substituting said result of said
calculation for said initial result value.
The reference relied upon by the examiner as evidence of
obviousness is:
Cocke et al. (Cocke) 4,306,286 Dec. 15,
1981
The appealed claims stand rejected under 35 U.S.C. § 103 as
being unpatentable over Cocke.
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