Appeal No. 1998-1506
Application No. 08/302,695
for a plurality of columns in his cache." Further, appellant
adds (Brief, page 9) that in Melton's system, one mapping law
is used for all of the columns (or banks), and "a particular
main memory address is transformed into the same local address
in each of Melton's columns." We agree. Melton uses a single
mapping matrix as exemplified in Figure 6 regardless of the
column or bank. Therefore, a single mapping function is used
for all cache memory banks.
The examiner seems to admit that Melton fails to disclose
a different mapping law for each bank by stating (Answer,
pages 6-7) that "it would have been obvious ... to improve CPU
utilization ... by maximizing the useful data or instructions
that remain in the cache by reducing thrashing by creating
[sic, or] using different mapping algorithms." Yet, the
examiner provides no support for a conclusion that plural
mapping laws would have been obvious. Further, the examiner
asserts (Answer, page 8) that Melton's mapping function is
different because "the matrix multiply is performed on
different bits of the address." In other words, the examiner
apparently believes that if each bit is multiplied by a
different number, then there are plural mapping functions.
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