Patent ID: 7894235

Claim:
A method for reading a 2T2C F-RAM device containing a plurality of F-RAM cells comprising; precharging a first bitline and a second bitline; precharging a first local I/O and a second local I/O; applying a WL signal to connect a first F-RAM cell from said plurality of F-RAM cells to said first bitline and a second F-RAM cell from said plurality of F-RAM cells to said second bitline; applying a YSEL signal to connect said first local I/O to a first current mirror and said second I/O to a second current mirror. applying a PL signal to read a first data value from said first F-RAM cell and a second data value from said second F-RAM cell; removing said YSEL signal to disconnect said first local I/O from said first current mirror and to disconnect said second local I/O from said second current mirror; applying a SA signal to couple a first input of a sense amp to said first local I/O and to couple a second input of said sense amp to said second local I/O; activating said sense amp; and applying a WB signal to connect said first bitline to said second local I/O and to connect said second bitline to said first local I/O to rewrite said first data value into said first F-RAM cell and to rewrite said second data value into said second F-RAM cell.