System and method for write-protecting predetermined portions of a memory array

Claim 3

The method of claim 1 wherein said step of defining comprises the step of partitioning said first and second memory locations within said memory array.

Claim 4

The method of claim 1 wherein said step of defining comprises the step of providing an additional memory word of said memory array as said first memory location.

Claim 5

The method of claim 1 wherein said step of defining is carried out by means of a non-volatile storage device.

Claim 6

The method of claim 4 wherein said non-volatile storage device comprises a ferroelectric random access memory integrated circuit.

Claim 7

The method of claim 1 further comprising the step of: writing said soft fuse value to said first memory location prior to said step of reading.

Claim 8

The method of claim 1 further comprising the step of: indicating to an external device whether said first memory location contains said soft fuse value.

Claim 9

An integrated circuit including a memory array having predetermined write-protectable portions thereof utilizing a number of lock bits settable for controlling subsequent writes to selected ones of said write-protectable portions, said memory array comprising: first and second memory locations for containing a known value forming a soft fuse value and said lock bits respectively; means, coupled to said first memory location, for comparing; coupled to said first memory location, for reading the contents of said first memory location to determine a read-out contents thereof; means, coupled to receive said soft fuse value and said read-out contents, for comparing said read-out contents of said first memory location to said soft fuse value; means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and resetting of individual ones of said lock bits if said read-out contents do not correspond to said soft fuse value; and means, coupled to said second memory location and resposive to said means for comparing for allowing setting and disallowing resetting of individual ones of said lock bits if said read-out contents correspond to said soft fuse value.

Claim 10

An integrated circuit including a memory array having predetermined write-protectable portions thereof utilizing a number of lock bits settable for controlling subsequent writes to selected ones of said write-protectable portions, said memory array comprising: first and second memory locations for containing a known value forming a soft fuse value and said lock bits respectively; means, coupled to said first memory location, for comparing; coupled to said first memory location, for reading the contents of said first memory location to determine a read-out contents thereof; means, coupled to receive said soft fuse value and said read-out contents, for comparing said read-out contents of said first memory location to said soft fuse value; means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and resetting of individual ones of said lock bits if said read-out contents do not correspond to said soft fuse value; and means, coupled to said second memory location and resposive to said means for comparing for allowing setting and disallowing resetting of individual ones of said lock bits if said read-out contents correspond to said soft fuse value.

Claim 11

The integrated circuit of claim 8 wherein said memory array comprises a non-volatile memory array.

Claim 12

The integrated circuit of claim 9 wherein said memory array comprises a ferroelectric memory array.

Claim 13

The integrated circuit of claim 10 wherein said first and second memory locations comprise a portion of said ferroelectric memory array.

Claim 14

The integrated circuit of claim 8 further comprising: means for writing said soft fuse value to said first memory location in response to an external device.

Claim 15

The integrated circuit of claim 12 further comprising: means for indicating to said external device whether said first memory location contains said soft fuse value.

Claim 16

An RF transponder including a memory array having predetermined write-protectable portions thereof utilizing a number of lock bits settable for controlling subsequent writes to selected ones of said write-protectable portions, said memory array comprising: first and second memory locations for containing a known value forming a soft fuse value and said lock bits respectively; means, coupled to said first memory location, for reading the contents of said first memory location to determine a read-out contents thereof; means, coupled to receive said soft fuse value and said read-out contents, for comparing said read-out contents of said first memory location to said soft fuse value; means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and resetting of individual ones of said lock bits if said read-out contents do not correspond to said soft fuse value; and means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and disallowing resetting of individual ones of said lock bits if said read-out contents correspond to said soft fuse value.

Claim 17

An RF transponder including a memory array having predetermined write-protectable portions thereof utilizing a number of lock bits settable for controlling subsequent writes to selected ones of said write-protectable portions, said memory array comprising: first and second memory locations for containing a known value forming a soft fuse value and said lock bits respectively; means, coupled to said first memory location, for reading the contents of said first memory location to determine a read-out contents thereof; means, coupled to receive said soft fuse value and said read-out contents, for comparing said read-out contents of said first memory location to said soft fuse value; means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and resetting of individual ones of said lock bits if said read-out contents do not correspond to said soft fuse value; and means, coupled to said second memory location and responsive to said means for comparing, for allowing setting and disallowing resetting of individual ones of said lock bits if said read-out contents correspond to said soft fuse value.

Claim 18

The RF transponder of claim 14 wherein said memory array comprises a non-volatile memory array.

Claim 19

The RF transponder of claim 15 wherein said memory array comprises a ferroelectric memory array.

Claim 20

The RF transponder of claim 16 wherein said first and second memory locations comprise a portion of said ferroelectric memory array.

Claim 21

The RF transponder of claim 14 further comprising: means for writing said soft fuse value to said first memory location in response to an external device.

Claim 22

The RF transponder of claim 18 further comprising: means for indicating to said external device whether said first memory location contains said soft fuse value.

Claim 23

The RF transponder of claim 19 wherein said external device is an RF controller.

Claim 24

The RF transponder of claim 20 wherein said means for indicating comprises a number of bits transmitted to said RF controller indicative of said soft fuse value being present or not present in said first memory location.