Appeal No. 96-1741
Application 08/160,111
barrel rotator is connected to one of the three inputs for
rotating the digital signal received at that input. A mask
generator is also provided which generates a multibit digital
mask signal as one of the three inputs to the ALU. A function
control input to the ALU determines which operations will be
performed on the three multibit digital inputs received by the
ALU.
Representative claim 1 is reproduced as follows:
1. A data processing apparatus comprising:
an arithmetic logic unit having first, second and
third data inputs for multibit digital signals representing
corresponding first, second and third input signals, and a
function control input for receiving a function signal, said
arithmetic logic unit generating at an output a multibit
digital signal representing a mixed arithmetic and Boolean
combination of said first, second and third inputs
corresponding to said function signal, said mixed arithmetic
and Boolean combination including at least an arithmetic
combination of only said first and second inputs and an
arithmetic combination of only said first and third inputs;
a first data source supplying a first multibit digital
signal to said first data input of said arithmetic logic unit;
a second data source supplying a second multibit
digital signal;
a barrel rotator having a data input connected to said
second data source, a rotate control input receiving a rotate
control signal, and a data output connected to said second
data input of the arithmetic logic unit, said barrel rotator
3
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