| 摘要 |
PURPOSE:To efficiently find out the physical location where an error occurred by providing a means for selecting the data of content of ROM compressed by a linear feedback shift register and the data of the content of ROM not compressed. CONSTITUTION:A signature output of a linear feedback shift register 5 being a data compressor and a data output of the ROM 3 are selected by using a selector 7. That is, in the test of contents of the ROM 3, the linear feedback shift register 5 is used to compress the data and it is judged as the occurrence of an error from the signature output, the select circuit 7 outputs a read data in the ROM 3. Thus, the test by the compressed data is made efficient and the physical location having an error is grasped easily. |
