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    • 1. 发明申请
    • Hardware security device for magnetic memory cells
    • 磁性存储单元的硬件安全装置
    • US20060146597A1
    • 2006-07-06
    • US10539795
    • 2003-12-15
    • Kars-Michiel LenssenAdrianus DenissenNicolaas Lambert
    • Kars-Michiel LenssenAdrianus DenissenNicolaas Lambert
    • G11C11/00G11C11/14G11C11/15
    • H01L23/57G11C11/16G11C11/1695H01L2924/0002H01L2924/00
    • The present invention provides a special structure of magnetic elements, e.g. MRAM elements (10, 11), as a security device (30) for IC's containing magnetic memory cells. The structure may comprise a combination of two or more associated magnetic elements (10, 11) with pre-set anti-parallel magnetization directions. By determining the polarisation directions of the magnetic elements, exposure to an external magnetic field can be detected. Inverse polarisation directions indicate a normal situation, aligned polarisation directions indicate that the MRAM-array has been exposed to an external field. In this way it can be detected whether it has been tried to erase or alter the data stored in the MRAM in an illegal way. The IC can regularly check the resistance of the security system during operation. Upon detection of a field exposure, the IC can erase all MRAM data, or can reset itself or block its functioning.
    • 本发明提供了一种磁性元件的特殊结构。 MRAM元件(10,11),作为用于包含磁存储器单元的IC的安全装置(30)。 该结构可以包括具有预设的反并联磁化方向的两个或更多个相关联的磁性元件(10,11)的组合。 通过确定磁性元件的极化方向,可以检测到暴露于外部磁场。 反偏振方向表示正常情况,对准偏振方向表示MRAM阵列暴露于外部场。 以这种方式,可以检测是否以非法方式擦除或更改存储在MRAM中的数据。 IC可以在运行期间定期检查安全系统的电阻。 在检测到场曝光时,IC可以擦除所有的MRAM数据,或者可以自动复位或阻止其功能。
    • 4. 发明申请
    • Programmable magnetic memory device
    • 可编程磁存储器件
    • US20070058422A1
    • 2007-03-15
    • US10529685
    • 2003-09-30
    • Gavin PhillipsKars-Michiel Lenssen
    • Gavin PhillipsKars-Michiel Lenssen
    • G11C11/00
    • G11C11/16G11B5/00G11B5/488G11B5/4907G11B2005/0002G11B2005/0021
    • A memory device has an information plane (32) for storing data bits in a magnetic state of an electro-magnetic material at an array of bit locations (31). The device further has an array of electro-magnetic sensor elements (51) that are aligned with the bit locations. The information plane (32) is programmable or programmed via a separate writing device (21). The writing device provides at least one beam of radiation (26) for heating the electro-magnetic material at the bit locations to a programming temperature. The magnetic state of the bit locations is programmed by applying a magnetic field during said heating of selected bit locations via the beams of radiation. Hence the memory device provides a magnetic read-only memory (MROM) that cannot be (re-)programmed without the proper writing device.
    • 存储器件具有信息平面(32),用于存储在位阵列(31)处的电磁材料的磁状态下的数据位。 该装置还具有与位位置对准的电磁传感器元件阵列(51)。 信息平面(32)可通过单独的写入装置(21)进行编程或编程。 写入装置提供至少一个辐射束(26),用于将位置处的电磁材料加热到编程温度。 位位置的磁状态通过在通过辐射束的所选位位置的加热期间施加磁场来编程。 因此,存储器件提供磁性只读存储器(MROM),其不能在没有适当的写入设备的情况下被编程(重新编程)。