Semiconductor integrated circuit device with copy-preventive function
    5.
    发明授权
    Semiconductor integrated circuit device with copy-preventive function 失效
    具有防复制功能的半导体集成电路器件

    公开(公告)号:US5781627A

    公开(公告)日:1998-07-14

    申请号:US509641

    申请日:1995-07-31

    IPC分类号: G06F12/14 G11C8/20 G11B23/28

    CPC分类号: G11C8/20 G06F12/1408

    摘要: A semiconductor integrated circuit device with a copy-preventive function comprises a memory for storing data to be used by users, an input unit for performing various logical operations on at least one input information fed externally and accessing the memory, an output unit for performing various logical operations on the data at the time of supplying the data from the memory, a judging unit for comparing at least one of the state of the input information, the logical state of the input unit, the logical state of the output unit, and the state of data provided by the output unit with specific judgment information and indicating the result of comparison, and a control unit that when the result indicated by the judging unit reveals that the at least one of the states is consistent with a specific state, acts at least on the output unit so as to prevent data stored in the memory from being supplied normally. Due to this configuration, a copy-preventive function can be reformed frequently from both the aspects of software and hardware. Consequently, illegal copying of data can be substantially disabled.

    摘要翻译: 具有防复制功能的半导体集成电路器件包括用于存储要由用户使用的数据的存储器,用于对外部馈送的至少一个输入信息执行各种逻辑运算并访问存储器的输入单元,用于执行各种 在从存储器提供数据时对数据进行逻辑运算,判断单元,用于比较输入信息的状态,输入单元的逻辑状态,输出单元的逻辑状态和输出单元的逻辑状态中的至少一个, 由输出单元提供的具有特定判断信息并指示比较结果的数据状态;以及控制单元,当判断单元指示的结果显示该至少一个状态与特定状态一致时, 至少在输出单元上,以防止存储在存储器中的数据被正常地提供。 由于这种配置,可以从软件和硬件的方面频繁地改变防复制功能。 因此,可以基本上禁用非法复制数据。

    Data signal output circuit and semiconductor memory device including the
same
    6.
    发明授权
    Data signal output circuit and semiconductor memory device including the same 失效
    数据信号输出电路和包括其的半导体存储器件

    公开(公告)号:US5600599A

    公开(公告)日:1997-02-04

    申请号:US359462

    申请日:1994-12-20

    CPC分类号: G11C7/106 G11C7/1051

    摘要: An object of the present invention is to improve the output speed of a data signal output circuit having a latch circuit when the supply voltage is low. The data signal output circuit according to the present invention includes a latch circuit; an output circuit; a latch control circuit; an output control circuit; and a supply voltage decrease detection circuit. The latch circuit latches and holds a data signal according to a latch signal output from the latch control circuit. By setting the latch signal to one of two logical states, the latch circuit changes to a through state directly outputting an input data signal. The output circuit changes between a state for outputting a data signal from the latch circuit and a high-impedance state according to an output control signal output from the output control circuit. The supply voltage decrease detection circuit detects whether or not the supply voltage is less than a pre-determined value. When the supply voltage decrease detection circuit detects that the supply voltage is less than the pre-determined value the latch control circuit outputs a latch signal to set the latch circuit to the through state and the output control circuit outputs an output control signal to set the output circuit to output the data signal from the latch circuit.

    摘要翻译: 本发明的一个目的是提供一种当电源电压低时具有锁存电路的数据信号输出电路的输出速度。 根据本发明的数据信号输出电路包括一个锁存电路; 输出电路; 锁存控制电路; 输出控制电路; 和电源电压降低检测电路。 锁存电路根据从锁存控制电路输出的锁存信号来锁存和保持数据信号。 通过将锁存信号设置为两个逻辑状态之一,锁存电路变为直接输出输入数据信号的直通状态。 输出电路根据从输出控制电路输出的输出控制信号,在从锁存电路输出数据信号的状态和高阻抗状态之间变化。 电源电压降低检测电路检测电源电压是否小于预定值。 当电源电压降低检测电路检测到电源电压小于预定值时,锁存器控制电路输出锁存信号以将锁存电路设置为通过状态,并且输出控制电路输出输出控制信号以设置 输出电路,从锁存电路输出数据信号。