1. A programmable logic device comprising: a bitstream decompressor adapted to decompress a compressed configuration bitstream comprised of a plurality of codewords into corresponding data words of an uncompressed configuration bitstream, the bitstream decompressor including: a buffer for receiving the compressed configuration bitstream, the buffer including shifting logic configured to shift the bitstream through the buffer such that following a shift of a codeword out of the buffer, a codeword to-be-decoded in the buffer has a known position in the buffer; and a Huffman decoder for decoding the codeword to-be-decoded in the known position in the buffer, wherein the Huffman decoder includes a first multiplexer adapted to select from a set of more-prevalent data words and a second multiplexer adapted to select from a null data word and the output of the first multiplexer.
1. A programmable logic device comprising: a bitstream decompressor adapted to decompress a compressed configuration bitstream comprised of a plurality of codewords into corresponding data words of an uncompressed configuration bitstream, the bitstream decompressor including: a buffer for receiving the compressed configuration bitstream, the buffer including shifting logic configured to shift the bitstream through the buffer such that following a shift of a codeword out of the buffer, a codeword to-be-decoded in the buffer has a known position in the buffer; and a Huffman decoder for decoding the codeword to-be-decoded in the known position in the buffer, wherein the Huffman decoder includes a first multiplexer adapted to select from a set of more-prevalent data words and a second multiplexer adapted to select from a null data word and the output of the first multiplexer. 6. The programmable logic device of claim 1 , wherein the programmable logic device is adapted to store within the device, for selection by the first multiplexer, data words that are included in the configuration bitstream and are members of the set of more-prevalent data words.