| 摘要 |
PCT No. PCT/GB87/00266 Sec. 371 Date Jan. 26, 1988 Sec. 102(e) Date Jan. 26, 1988 PCT Filed Apr. 23, 1987 PCT Pub. No. WO87/06786 PCT Pub. Date Nov. 5, 1987.In a method for converting n data input bits to n data output bits, groups of m data input bits from an input data buffer (10) are used as address input for a plurality of identical substitution look-up tables (20 to 27). Each look-up table (20 to 27) has a plurality of groups of m data output bits stored at a plurality of locations in the table. The output bits held at each location within the look-up tables (20 to 27) are dependent on a control word taken from a control word register (11).
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