Patent ID: 6269016
Filing Date: 2001-07-31
Classification: G11C

Abstract:
In an integrated circuit (IC) magnetic random access memory (MRAM) content addressable memory (CAM) system having at least one CAM cell consisting of:a first data bit, comprised of a first MRAM cell which is writeable in a first logic state in response to a coincidence of a wordwrite current and a first bitwrite current provided in a first direction, and in a second logic state in response to a coincidence of said wordwrite current and said first bitwrite current provided in a second direction; anda second data bit, comprised of a second MRAM cell which is writeable in said first logic state in response to a coincidence of said wordwrite current and a second bitwrite current provided in said first direction, and in said second logic state in response to a coincidence of said wordwrite current and said second bitwrite current provided in said second direction;a method for writing said CAM cell, comprising the steps of:receiving an input bit having one of said first and second logic states;providing said wordwrite current;in response to receiving said input bit in said first logic state:providing said first bitwrite current to said first MRAM cell in said first direction; andproviding said second bitwrite current to said second MRAM cell in said second direction; andin response to receiving said input bit in said second logic state:providing said first bitwrite current to said first MRAM cell in said second direction; andproviding said second bitwrite current to said second MRAM cell in said first direction.