| 摘要 |
PURPOSE:To execute the comparison test without noticing a write data at the comparison of data by writing the data of an optional repetitive pattern as a write data and comparing a part of the data and other readout data at readout. CONSTITUTION:A data pattern written in a write data memory 4 is written from a processor MPU7 at WRITE. As the data pattern, for example, a repetitive data of ''1234'' is used. A data is written from the memory 4 to a test device 1. The repetitive pattern of 16-Byte is written by using a low-cost 4-bit of a Byte counter 3 as an address. The 1st 16-Byte of a READ data is written in a comparison data memory 5 at READ. Data after the next and succeeding data are written in an READ data memory 6 and compared with the data written in the memory 5 at the same time by a comparator circuit 8. The repetitive data in 16-Byte attains the comparison by using a low-order 4-bit of the Byte counter as the address data of the memory 5 in this case. |
