Muncy, Geissler, Olds & Lowe, P.C.
Decoding device and method for absolute positioning code
A decoding device for an absolute positioning code is provided. The decoding device includes a linear feedback shift register (LFSR), a lookup table (LUT) circuit, a counter circuit, and a computation circuit. The LFSR includes n registers, for loading the absolute positioning code with a first frequency. The LFSR performs shifting operation according to a clock signal having a second frequency greater than or equal to the first frequency. The LUT circuit outputs a lookup result and a valid flag according to values stored in the n registers. The lookup result has k different data, k≦(2n−1). The counter circuit resets according to the valid flag, and performs counting operation according to the clock signal to generate a counting result. The computation circuit performs calculation according to the lookup result and the counting result to generate a decoding result when the valid flag indicates valid.
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
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H04L H04L G02B G01D G01D H04B
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Chien-Wen Yung-Chang Huan-Chi
Chen Chen Huang