Appeal No. 2000-1361 Page 10
Application No. 08/933,880
according to the value of the output of the input registers that
an output value of the combinatorial block is present.
Assuming arguendo, that one of the lines from registers 640
and 650 to blocks 580, 590, 620, and 621 is included in the
“combinatorial block” for presenting a trivial output to the
output register, Richardson would still not teach the claimed
conditions for the enable signal. For simplicity, we can read
the “combinatorial block” on multiplier 500 as well as the line
from input register 650 to register 580. We note that the
specification does not disclose the internal construction of the
combinatorial block and does not exclude lines in the
combinatorial block which directly present the input value to the
output as in Richardson. When the “analysis unit” (comparator
block 520) determines that x equals 1, indicative of a trivial
operand, the “analysis unit” outputs a signal to the “output
register” (register 580) which immediately outputs the result
that has been previously provided by the line in the
combinatorial block and stored in register 580. Therefore, the
result is sent to the output register if an output value of the
combinatorial block is present according to the value of the
output of the input register. An output value of the
combinatorial block is present on the line leading to block 580
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