Patent ID: 7013413
Filing Date: 2006-03-14
Classification: G11C

Abstract:
1. A method for compressing output data comprising: reading a first data from a core cell region and prefetching the first data having a first number of bits in a normal mode; writing the first data of the first number of bits into an address of the core cell region in a test mode; reading the first data written into the address of the core cell region and prefetching the read data; comprising the first data and the read data by dividing each of the first data and the read data into an upper portion having a second number of bits and a lower portion having a remaining member of bits; and compressing a result from the comparing to generate a compressed dam with information indicating whether a failure is present; selecting a selected data from the prefetched first data in a normal mode and the compressed data in a test mode; shifting the selected data at an ascending edge and a descending edge of a clock signal and outputting the selected data serially via one or more output pads in a normal mode; shifting the selected data at an ascending edge and a descending edge of the clock signal and outputting the selected data serially via one of the one or mole output pads in a test mode, wherein the first number of bits associated with the prefetched first data, first data, and the read data is 8; the second number of bits associated with the upper portion is 4; the remaining number of bits associated with the lower portion is 4; and the compressed data is 1-bit signal.