Appeal No. 95-3912
Application 08/087,247
Appellants have appealed to the Board from the examiner’s
final rejection of claims 1 to 23, which constitute all the
claims in the application.
Representative claim 1 is reproduced below:
1. A chain interface controller for controlling a
plurality of integrated input/output controllers, wherein the
requirement for a dedicated programmed microprocessor for
handling data conversion for said chain interface controller
is removed, said chain interface controller comprising:
oversampling means for eliminating random voltage spikes
from an input chain of digital data, the input chain
comprising a plurality of bits, each bit of said plurality of
bits corresponding to an integrated input/output controller
and representative of a state of said corresponding integrated
input/output controller, said oversampling means eliminating
random voltage spikes on said input data chain by sampling
each bit of said chain of digital data on a bit-by-bit basis
three times during a clock period of the chain of data, each
sample being taken at a first predetermined interval from an
immediately previous sample, said oversampling means
outputting a binary value of each bit of said chain of data,
said binary value being representative of a majority of three
samples of each bit taken during the clock period, said binary
value being an oversampled bit of said chain of digital data;
filter means for debouncing said input chain of digital
data by receiving said oversampled bits of data from said
oversampling means and filtering each of said oversampled bits
three times at a second predetermined interval and storing a
filtered sample representative of three successive non-
changing samples in a filtered input register, said second
predetermined interval being representative of a frame clock
period;
input data change detecting means for detecting a change
in any bit of the chain of data and changing a status bit of
2
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