Realtek Semiconductor Inc.

Kai-Li Lee

Jung-Tang Chiang

Meng-Han Hsieh

A deinterleaving device includes a memory space, the memory space being divided into a plurality of N segments with different lengths respectively. A method of accessing data in a deinterleaving device, the method including performing the following steps during a first time cycle: reading first read data from a first address of a first segment; reading second read data from a first address of a second segment, and writing first write data into the first address of the second segment; reading third read data from a first address of a third segment, and writing second write data into the first address of the third segment; repeating the above reading and writing steps until reading Nread data from a first address of an Nsegment, and writing N&#x2212;1write data into the first address of the Nsegment; writing Nwrite data into the first address of the first segment.

Method of accessing data in a deinterleaving device

A demapper, applied to a quadrature amplitude modulation trellis coded modulation (QAM-TCM) decoder, for generating more significant bits of a QAM signal according to the QAM signal and at least a less significant bit of the QAM signal is disclosed. The demapper includes a shifter for shifting the QAM signal to generate a shifted signal; a threshold value comparing and mapping unit for outputting at least a more-significant-bit buffered value; a sign bit decider for determining a sign value corresponding to the shifted signal; a multiplexer for generating a first more-significant-bit estimation and a second more-significant-bit estimation; and an operating unit for determining a third more-significant-bit estimation and a fourth more-significant-bit estimation.

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Hsinchu, Taiwan

Kai-Li Lee