Appeal No. 2000-0372
Application No. 08/421,338
received by the system and output values are headers of corresponding data streams
transmitted by the communication system. It is desirable to change the input value into the
corresponding or related output value and the invention is directed to performing this task
faster by establishing, or following, a unique path, identified by the input variable, in
sequence through a plurality of cascaded memories to a unique storage location which
contains the desired corresponding output value.
Independent claim 1 is reproduced as follows:
1. An apparatus for providing output values corresponding to a number E
p
of n-bit input values, with E being an integer lower or equal to 2 - 1,
characterized in that it comprises:
- a plurality of cascaded random access memories (24-A, 24-B and 24-C)
d
having a 2 addressing capability, where d is an integer higher than p,
- means for storing in each random access memory p-bit pointers, each one
of them being different from the others and being assigned to one input
value,
- means (40, 122 to 158) for sequentially addressing and reading at least
one of the random access memories, the first one being addressed with a
part including a number n1 of bits of the input value, with n1 equal or lower
than d, and each one of the next memories being addressed with the pointer
read from the preceding memory concatenated with a part including a
number ni of bits of the input value, with ni equal to or lower than n-n1,
- means (40, 160) for finding the output value as a result of the addressing of
the last random access memory in the sequence.
2
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