| 摘要 |
PURPOSE:To transfer data with a high reliability without reducing the effective transfer rate of multibit parallel data where simultaneous switching noise occurs. CONSTITUTION:A bit change detecting circuit 1 compares data outputted at present and data to be next outputted with each other with one bit as the unit to detect whether the bit variation is larger than a set value or not, and a bit pattern conversion signal which is significant in the case of the bit variation larger than the set value is outputted. If the bit pattern conversion signal is significant, a bit pattern converting circuit 2 inverts all bits of data to be next outputted to output the bit pattern of less bit variation; but otherwise, the circuit 2 outputs this data as it is. The one-bit of bit pattern conversion signal is added to this output, and it is transferred. The transfer destination fetches transfer data including the one-bit of bit pattern conversion signal; and if the bit pattern conversion signal is significant, all bits are internally inverted to restore the original data. |
