摘要:
A method of selectively programming nonvolatile memory cells in which multiple programming voltages are used to obtain the desired voltage on the storage nodes of the cells selected for programming, while the storage nodes of unselected cells remain undisturbed.
摘要:
An integrated nonvolatile memory circuit having a plurality of control devices. Separate devices execute distinct control, erase, write and read operations, thereby allowing each device to be individually selected and optimized for performing its respective operation.
摘要:
A non-volatile memory (NVM) cell splits its basic function, i.e. program, erase, read and control, among a four PMOS transistor structure, allowing independent optimization of each function. The cell structure also includes an embedded static random access memory (SRAM) cell that utilizes a latch structure to preprogram data to be written to the cell. The programming method for the cell utilizes a reverse Fowler-Nordheim tunneling mechanism with a very small programming current, allowing an entire NVM array to be programmed at one cycle.
摘要:
A non-volatile memory cell includes NMOS programming, read, erase, and control transistors having gate electrodes connected to a storage node. The erase and control transistors have interconnected source, drain, and bulk electrodes. The cell is programmed by setting source, drain, bulk, and gate electrodes of all transistors to a positive voltage. An inhibiting voltage is applied to source, drain, and bulk electrodes of the read transistor, while setting source and drain electrodes of the programming transistor to the positive voltage and the bulk electrode of the programming transistor to the positive voltage or the inhibiting voltage. Source, drain, and bulk electrodes of the control transistor are then ramped to a negative control voltage while ramping source, drain, and bulk electrodes of the erase transistor to a negative erase voltage and then back to the positive voltage. Source, drain. bulk, and gate electrodes of the programming, erase, and control transistors are then returned to the positive voltage, while setting the source, drain, and bulk electrodes of the read transistor to the inhibiting voltage.
摘要:
A non-volatile memory (NVM) cell structure comprises a PMOS program transistor having source, drain and bulk region electrodes and a gate electrode that is connected to a data storage node; an NMOS control transistor having source, drain and bulk region electrodes that are commonly-connected to receive a control voltage and a gate electrode that is connected to the data storage node; a PMOS erase transistor having source, drain and bulk region electrodes that are commonly-connected to receive an erase voltage and a gate electrode that is connected to the data storage node; and an NMOS read transistor having source, drain and bulk region electrodes and a gate electrode connected to the data storage node.
摘要:
An NVM cell design enables direct reading of cell output voltage to determine data stored in the cell, while providing low current consumption and a simple program sequence that utilizes reverse Fowler-Nordheim tunneling.
摘要:
Anti-pirate circuitry is provided for combating the theft of intellectual property contained with semiconductor integrated circuits. The anti-pirate circuit includes a unique number generator that provides a multi-bit die ID data string that is unique to the integrated circuit associated with the anti-pirate circuit. One time programmable (OTP) EPROM circuitry reads the die ID data string at wafer sort and writes the data content to nonvolatile memory. During a subsequent verification cycle, ID comparator circuitry compares the data string provided by the unique number generator to the stored contents of the nonvolatile memory. If the comparison results in a mismatch between more than a predefined number of bits, then the integrated circuit associated with the anti-pirate circuit is not enabled for operation.
摘要:
Anti-pirate circuitry is provided for combating the theft of intellectual property contained with semiconductor integrated circuits. The anti-pirate circuit includes a unique number generator that provides a multi-bit die ID data string that is unique to the integrated circuit associated with the anti-pirate circuit. One time programmable (OTP) EPROM circuitry reads the die ID data string at wafer sort and writes the data content to nonvolatile memory. During a subsequent verification cycle, ID comparator circuitry compares the data string provided by the unique number generator to the stored contents of the nonvolatile memory. If the comparison results in a mismatch between more than a predefined number of bits, then the integrated circuit associated with the anti-pirate circuit is not enabled for operation.
摘要:
A non-volatile memory (NVM) cell splits its basic functions, i.e. program, erase, read and control, among a four PMOS transistor structure, allowing independent optimization of each cell function. The cell structure also includes an embedded static random access memory (SRAM) cell that utilizes a latch structure to preprogram data to be written to the cell and a plurality of cascoded NMOS pass gates. The cell structure reduces total programming time and provides the flexibility of programming the entire cell array simultaneously or one row or sector of the array at a time.