Appeal No. 95-4913
Application No. 07/962,425
As indicated by the title, the disclosed invention relates
to a method and system for reduced metastability between devices
which communicate and operate at different clock frequencies.
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. A method in a data processing system having a first
clock operating at a first clock rate and a second clock
operating at a second clock rate for improving communication
between a first device associated with said first clock rate and
a second device associated with said second clock rate, said
method comprising within said data processing system the steps
of:
determining particular periods of time during which
metastability may occur as a result of data being transmitted
from said first device at said first clock rate and received by
said second device at said second clock rate;
continually processing said data by double latching said
data transmitted from said first device to said second device;
during said particular periods of time, inputting said
processed data into said second device; and
during all other periods of time, inputting said data
directly into said second device.
The references relied on by the examiner are:
Heckel 4,176,400 Nov. 27, 1979
Flemming 4,405,898 Sep. 20, 1983
Azevedo et al. (Azevedo) 4,868,514 Sep. 19, 1989
Claims 1, 3 through 6 and 8 through 10 stand rejected under
35 U.S.C. § 103 as being unpatentable over the admitted prior art
(specification, pages 2 and 3) in view of Flemming and Heckel.
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