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    • 6. 发明授权
    • Electrically switchable permanent storage
    • 电可切换永久存储
    • US4445202A
    • 1984-04-24
    • US317669
    • 1981-11-02
    • Volkmar GoetzeEkkehard F. MierschGuenther Potz
    • Volkmar GoetzeEkkehard F. MierschGuenther Potz
    • G11C17/00G11C17/12H01L21/8246H01L27/112H03K19/177G11C13/00
    • G11C17/12H03K19/17712
    • For read-only storages and in particular for PLA applications, improved coupling elements together with an associated personalization scheme permit the storing of at least two memory (or logic) connection patterns selectable independently of each other. Quick electrical switching between at least two functional modes in the same storage array, is also provided. One device field effect transistor (FET) cells with specific gate configurations depending on the respective personalization state are used as coupling elements. For instance, in a two-fold personalization permanent storage, the coupling elements consist of FETs with two gate sections provided one beside the other. For a connection to be established in only one of the two possible functions at the respective crosspoint, one of the gate sections is connected to the control line provided for the functional selection. The remaining gate section is connected to the associated input line. A connection in the other functional mode is provided correspondingly with only the control lines being switched. If at the respective crosspoint a connection is to be effective in both functional modes, both gate sections are jointly connected to the respective input line. By using only one common peripheral circuit, PLAs with multiple personalization properties can be made in integrated technology, with the same semiconductor area requirement as PLAs personalizable into only one functional mode.
    • 对于只读存储器,特别是对于PLA应用,改进的耦合元件以及相关联的个性化方案允许存储彼此独立选择的至少两个存储器(或逻辑)连接模式。 还提供了在同一存储阵列中的至少两个功能模式之间的快速电切换。 作为耦合元件,使用具有取决于相应个性化状态的特定栅极配置的一个器件场效应晶体管(FET)单元。 例如,在双重个性化永久存储器中,耦合元件由具有两个旁路提供的两个栅极部分的FET组成。 对于仅在相应交叉点处仅在两个可能功能中的一个中建立的连接,其中一个栅极部分连接到为功能选择提供的控制线。 剩余的栅极部分连接到相关的输入线。 相应地提供另一个功能模式的连接,只有控制线被切换。 如果在相应的交叉点处连接在两种功能模式下都是有效的,则两个门部分共同连接到相应的输入线。 通过仅使用一个通用外围电路,可以在集成技术中制造具有多种个性化特性的PLA,其具有与仅可一个功能模式个性化的PLA相同的半导体面积要求。