Patent application number | Description | Published |
20090086524 | PROGRAMMABLE ROM USING TWO BONDED STRATA AND METHOD OF OPERATION - A read only memory implemented as a 3D integrated device has a first stratum, a second stratum, and bonded inter-strata connections for coupling the first stratum to the second stratum. The physical bonding between the two strata implements the programming of the read only memory. The stratum may be in wafer form or in die form. The first stratum includes functional active devices and at least one non-programmed active device. The second stratum includes at least conductive routing to be associated with the at least one non-programmed active device. The bonded inter-strata connections include at least one bonded programmable inter-strata connection for programming the at least one non-programmed active device and for providing conductive routing to the programmed active device. The two strata thus form a programmed ROM. Other types of programmable storage devices may be implemented by bonding the two strata. | 04-02-2009 |
20120155160 | MEMORY CONTROLLER AND METHOD FOR INTERLEAVING DRAM AND MRAM ACCESSES - A memory controller and method for interleaving volatile and non-volatile memory different latencies and page sizes are described wherein a single DDR3 memory controller communicates with a number of memory modules comprising of at least non-volatile memory, e.g., spin torque magnetic random access memory, integrated in a different Rank or Channel with a volatile memory, e.g., dynamic random access memory (DRAM). | 06-21-2012 |
20120195112 | METHOD OF WRITING TO A SPIN TORQUE MAGNETIC RANDOM ACCESS MEMORY - A method includes destructively reading bits of a spin torque magnetic random access memory and immediately writing back the original or inverted values. A detection of the majority state of the write back bits and a conditional inversion of write back bits are employed to reduce the number of write back pulses. A subsequent write command received within a specified time or before an original write operation is commenced will cause a portion of the write back pulses or the original write operation pulses to abort. Write pulses during subsequent write operations will follow the conditional inversion determined for the write back bits during destructive read. | 08-02-2012 |
20120198313 | METHOD OF READING AND WRITING TO A SPIN TORQUE MAGNETIC RANDOM ACCESS MEMORY WITH ERROR CORRECTING CODE - A method includes destructively reading bits of a spin torque magnetic random access memory, using error correcting code (ECC) for error correction, and storing inverted or non-inverted data in data-store latches. When a subsequent write operation changes the state of data-store latches, parity calculation and majority detection of the bits are initiated. A majority bit detection and potential inversion of write data minimizes the number of write current pulses. A subsequent write operation received within a specified time or before an original write operation is commenced will cause the majority detection operation to abort. | 08-02-2012 |
20120311396 | MRAM FIELD DISTURB DETECTION AND RECOVERY - A method and memory device is provided for reading data from an ECC word of a plurality of reference bits associated with a plurality of memory device bits and determining if a double bit error in the ECC word exists. The ECC word may be first toggled twice and the reference bits reset upon detecting the double bit error. | 12-06-2012 |
20130128650 | DATA-MASKED ANALOG AND DIGITAL READ FOR RESISTIVE MEMORIES - An analog read circuit measures the resistance of each of a plurality of bits in an array of resistive memory elements. Data stored within a latch determines whether to selectively enable the analog read circuit. In an alternate embodiment, a sense amplifier is coupled to the latch and the array, and the data stored in the latch determines whether to selectively enable the sense amplifier. | 05-23-2013 |
20130128657 | HYBRID READ SCHEME FOR SPIN TORQUE MRAM - A method of reading data from a plurality of bits in a spin-torque magnetoresistive memory array includes performing one or more referenced read operations of the bits, and performing a self-referenced read operation, for example, a destructive self-referenced read operation, of any of the bits not successfully read by the referenced read operation. The referenced read operations can be initiated at the same time or prior to that of the destructive self-referenced read operation. | 05-23-2013 |
20130128658 | WRITE DRIVER CIRCUIT AND METHOD FOR WRITING TO A SPIN-TORQUE MRAM - A write driver for writing to a spin-torque magnetoresistive random access memory (ST-MRAM) minimizes sub-threshold leakage of the unselected (off) word line select transistors in the selected column. An effective metal resistance in the bit line and/or source line is reduced and power supply noise immunity is increased. Write driver bias signals are isolated from global bias signals, and a first voltage is applied at one end of a bit line using one of a first NMOS-follower circuit or a first PMOS-follower circuit. A second voltage is applied at opposite ends of a source line using, respectively, second and third PMOS-follower circuits, or second and third NMOS-follower circuits. | 05-23-2013 |
20130155763 | CIRCUIT AND METHOD FOR SPIN-TORQUE MRAM BIT LINE AND SOURCE LINE VOLTAGE REGULATION - Circuitry and a method for regulating voltages applied to source and bit lines of a spin-torque magnetoresistive random access memory (ST-MRAM) reduces time-dependent dielectric breakdown stress of the word line transistors. During a read or write operation, only the selected bit lines and source lines are pulled down to a low voltage and/or pulled up to a high voltage depending on the operation (write | 06-20-2013 |
20130272060 | SELF-REFERENCED SENSE AMPLIFIER FOR SPIN TORQUE MRAM - Circuitry and a method provide a plurality of timed control and bias voltages to sense amplifiers and write drivers of a spin-torque magnetoresistive random access memory array for improved power supply noise rejection, increased sensing speed with immunity for bank-to-bank noise coupling, and reduced leakage from off word line select devices in an active column. | 10-17-2013 |
20130301346 | SELF REFERENCING SENSE AMPLIFIER FOR SPIN TORQUE MRAM - Circuitry and a method provide self-referenced sensing of a resistive memory cell by using its characteristic of resistance variation with applied voltage in one state versus a relatively constant resistance regardless of the applied voltage in its opposite state. Based on an initial bias state with equalized resistances, a current comparison at a second bias state between a mock bit line and a bit line is used to determine the state of the memory cell, since a significant difference in current implies that the memory cell state has a significant voltage coefficient of resistance. An offset current applied to the mock bit line optionally may be used to provide symmetry and greater sensing margin. | 11-14-2013 |
20130308374 | CIRCUIT AND METHOD FOR CONTROLLING MRAM CELL BIAS VOLTAGES - A cell bias control circuit maximizes the performance of devices in the read/write path of memory cells (magnetic tunnel junction device+transistor) without exceeding leakage current or reliability limits by automatically adjusting multiple control inputs of the read/write path at the memory array according to predefined profiles over supply voltage, temperature, and process corner variations by applying any specific reference parameter profiles to the memory array. | 11-21-2013 |
20140073133 | METHOD TO MITIGATE THROUGH-SILICON VIA-INDUCED SUBSTRATE NOISE - A semiconductor manufacture includes a first semiconductor including a substrate die having a first surface and having a second surface upon which integrated circuitry is disposed; a second semiconductor die; a through-silicon via (TSV) extending through the first semiconductor die and electrically connected to the second semiconductor die; and at least one ground plug including an electrically conductive material, positioned proximally to the TSV and extending into the substrate of the first semiconductor die from one of the first surface or the second surface. | 03-13-2014 |
20140104937 | MEMORY DEVICE WITH TIMING OVERLAP MODE - In some examples, a memory device is configured to receive a precharge command and an activate command. The memory device performs a first series of events related to the precharge command in response to receiving the precharge command and a second series of events related to the activate command in response to receiving the activate command. The memory device delays the start of the second series of events until the first series of events completes. | 04-17-2014 |
20140104963 | MEMORY DEVICE WITH REDUCED ON-CHIP NOISE - In some examples, a memory device includes multiple memory banks equipped with an isolation switch and dedicated power supply pins. The isolation switch of each memory bank is configured to isolate the memory bank from global signals. The dedicated power supply pins are configured to connect each of the memory banks to a dedicated local power supply pads on the package substrate to provide local dedicated power supplies to each of the memory banks and to reduce voltage transfer between memory banks over conductors on the device, the device substrate, or the package substrate of the memory device. | 04-17-2014 |
20140372792 | METHOD FOR HEALING RESET ERRORS IN A MAGNETIC MEMORY - A method is provided for healing reset errors for a magnetic memory using destructive read with selective write-back, including for example, a self-referenced read of spin-torque bits in an MRAM. Memory cells are prepared for write back by one of identifying memory cells determined in error using an error correcting code and inverting the inversion bit for those memory cells determined in error; identifying memory cells determined in error using an error correcting code and resetting a portion of the memory cells to the first state; and resetting one or more memory cells to the first state. | 12-18-2014 |
20150019806 | MEMORY DEVICE WITH PAGE EMULATION MODE - In some examples, a memory device is configured to load multiple pages of an internal page size into a cache in response to receiving an activate command and to write multiple pages of the internal page size into a memory array in response to receiving a precharge command. In some implementations, the memory array is arranged to store multiple pages of the internal page size in a single physical row. | 01-15-2015 |
20150029786 | SELF-REFERENCED SENSE AMPLIFIER FOR SPIN TORQUE MRAM - Circuitry and a method provide a plurality of timed control and bias voltages to sense amplifiers and write drivers of a spin-torque magnetoresistive random access memory array for improved power supply noise rejection, increased sensing speed with immunity for bank-to-bank noise coupling, and reduced leakage from off word line select devices in an active column. | 01-29-2015 |