Patent ID: 6345007
Filing Date: 2002-02-05
Classification: G11C

Abstract:
A method for pre fetching and restoring data stored in memory cells in a semiconductor memory device, comprising the steps of:a) performing a pre fetching operation, the pre fetching operation including the steps of: applying the data onto pairs of bit lines after a specific word line is activated by a row path; sensing the data applied on the pairs of bit lines by bit line sense amplifiers driven in response to an enabled bit line sense amplifier driving signal; and transferring the data applied on the pairs of bit lines to pairs of global data bus lines in response to a control signal for connecting the pairs of bit lines with the pairs of global data bus lines, and b) performing a restoring operation, the restoring operation including the steps of: applying the data on the pairs of bit lines when the specific word line is activated by the row path; applying write data on the pairs of global data bus lines; transferring the write data applied on the pairs of global data bus lines to the pairs of bit lines in response to the control signal; and sensing the write data applied on the pairs of bit lines by the bit line sense amplifiers to store sensed write data into the memory cells.