| 摘要 |
PURPOSE: To ensure an integrated circuit chip of data protection by a method wherein a semiconductor layer is partitioned into a protected region and a non-protected region, a microprocessor and a memory to protect are provided in the protected region, and a memory and a logic which control them are provided in the non-protected region, and the two partitioned regions are connected with a conductive layer. CONSTITUTION: An IC chip 10 is partitioned into a protected region 11 and a non-protected region 12, wherein a microprocessor 14 which processes the protected data, memories M1 to M4 which store the protected data, a data bus 16, an address bus 17, a transfer logic circuit 18, and a circuit 20 which controls clock and a power are provided in the protected region 11. A non- protected memory 24 and a non-protected logic 26 are provided in the non- protected region 12, and the outputs of them are inputted into the logic 18 located in the region 11 through the intermediary of the data bus 28. Thereafter, signals selected by the logic 18 are inputted into the prescribed device located in the region 11, whereby the protected data are prevented from being erroneously inspected and modified. |
