Odd Parity Generator Preset-Type Gray Code Counter Based on GAL

The main trouble of address bus of computer program memory coded by Gray code hasn't been widely applied is presetting of Gray code counter isn't easy.Using the odd parity generator in Gray code counter,the presetting can be solved perfectly.Two kinds of Gray code plus counter of additional bit preset-type and direct preset-type are designed.The latter is implemented by GAL16V8 and the validity of the design is confirmed.