| 摘要 |
PROBLEM TO BE SOLVED: To capture read data read by a usual read operation using a boundary scan function.SOLUTION: A semiconductor device comprises at least one memory chip, the memory chip including: a plurality of data input/output terminals 35 each for inputting write data or outputting read data; a boundary scan unit BSU having a plurality of IO units IOU each connected to each of the data input/output terminals 35 and boundary wiring Lb connecting each of the IO units IOU to form a cascade connection; and a serial data output terminal 72 for outputting serial data from the IO units IOU through the boundary wiring Lb. The boundary scan unit BSU provides a parallel output of read data read from a memory cell array for the data input/output terminals and receives again read data appearing at the data input/output terminals to latch the read dada at a predetermined timing. Then, the boundary scan unit BSU provides a serial output from a serial data output terminal. |
