Goodard v. Google, Inc.
Filing
73
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Goodard v. Google, Inc.
Doc. 73 Att. 10
EXHIBIT J
Dockets.Justia.com
Purcell Purcell
U.S. Patent No. U.S. 5,623,434 5,623,434
Background for the Purcell Invention
Structure and method for using an arithmetic and logic unit ("ALU") as the carry propagation stage of a multiplier.
· Computer processors perform basic mathematical functions Computer such as addition and multiplication. such · Traditionally, processors used separate, duplicative circuitry Traditionally, to perform addition and multiplication. to
Purcell: '434 Patent Purcell:
Purcell: '434 Patent Purcell:
Prior Art
105
Multipl y Circuitry
111
102 104 106 131
103 107 132
Add Circuitry
112
Carry Save Stage
110
ALU
130
115
117
Pipeline 116 Register
135
CP A CPA
119 100
118 Adder
Circuit
141
MUX
148 150 140
FIG. 1a
(PRIOR ART)
Statement of the Invention
Purcell: '434 Patent Purcell:
The invention is a novel circuit that requires only one-half of a traditional multiplier circuit only half connected to an existing ALU to perform a complete multiply operation. complete
Purcell's Invention
Purcell: '434 Patent Purcell:
210
Carry Save Stage
ALU
230
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