the multiplexer 260 to close thereby providing a path for voltage to reach the electrical fuse 256 if the electrical fuse 256 has already been broken through previous programming a node 262 will not have a signal the rwlb will need to have a low signal in order to turn on the output select device 250 and the pmos device 252 to allow the sense amplifier 240 to determine if the resistance value at the node 262 is logically high or low in comparison with a reference resistor 264 by comparing the resistance value of the electrical fuse 256 with a reference resistor 264 the sense amplifier 240 may conclude that the electrical fuse 256 has already been blown and programmed it is also important for a y select line yselb to input a high signal to an input select device 266 thereby turning it off and not allowing any signal to enter a programming device 268 through a write wordline wwl this prevents the node 262 from being grounded during the reading process similarly if the electrical fuse 254 which as an example is non programmed the rwlb will again provide a low signal to turn on the output select device 250 and the pmos device 252 to allow the sense amplifier 240 to operate the yselb will input a high signal to the input select device 266 during the reading process to prevent the programming device 268 from turning on thereby grounding the node 262 the multiplexer 258 will be closed thus allowing voltage to pass through the electrical fuse 254 to reach the node 262 the sense amplifier 240 will compare the resistance of the electrical fuse 254.