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    • 5. 发明授权
    • Low voltage interface circuit with a high voltage tolerance
    • 具有高电压容差的低压接口电路
    • US5933025A
    • 1999-08-03
    • US784163
    • 1997-01-15
    • Scott S. NanceMohammad R. TamjidiRichard C. LiJennifer WongHassan K. Bazargan
    • Scott S. NanceMohammad R. TamjidiRichard C. LiJennifer WongHassan K. Bazargan
    • H03K19/003H03K19/0185H03K19/094
    • H03K19/09429H03K19/00315H03K19/018521
    • A low voltage interface circuit with a high voltage tolerance enables devices with different power supply levels to be efficiently coupled together without significant leakage current or damage to the circuits. One embodiment of the present invention comprises a tri-state control circuit, a data path, a reference voltage circuit, and an isolation circuit. The interface circuit provides a high impedance receive mode. In this mode, when a voltage is applied to the I/O pin of the interface circuit which is sufficiently greater than the interface circuit power supply voltage, the isolation circuit isolates the power supply from the I/O pin. The interface circuit also protects all of the transistors from gate to bulk, gate to source and gate to drain voltage drops of greater than a specified voltage, for example 3.6V for a nominal 3V power supply when up to 5.5V is being externally applied to the I/O pin. In high impedance mode when the externally applied voltage at the I/O pin is sufficiently below the interface circuit supply voltage, the isolation circuit is driven to approximately the interface circuit supply voltage. In low impedance mode the isolation circuitry is disabled and the logic level at the data terminal is transmitted to the I/O pin. One embodiment of the present invention provides a buffered data path from the data terminal to the I/O pin.
    • 具有高电压公差的低压接口电路使得具有不同电源电平的器件能够有效耦合在一起,而不会有明显的漏电流或电路损坏。 本发明的一个实施例包括三态控制电路,数据通路,参考电压电路和隔离电路。 接口电路提供高阻抗接收模式。 在这种模式下,当接口电路的I / O引脚施加的电压足够大于接口电路电源电压时,隔离电路会将电源与I / O引脚隔离开来。 接口电路还保护所有的晶体管从栅极到体积,栅极到源极和漏极到大于指定电压的电压降,例如对于额定3V电源的3.6V,当高达5.5V被外部施加到 I / O引脚。 在高阻抗模式下,当I / O引脚的外部施加电压足够低于接口电路电源电压时,隔离电路被驱动到大致接口电路电源电压。 在低阻模式下,隔离电路被禁用,数据端子的逻辑电平被传输到I / O引脚。 本发明的一个实施例提供从数据终端到I / O引脚的缓冲数据路径。
    • 6. 发明授权
    • Multiport RAM with programmable data port configuration
    • 多端口RAM,具有可编程数据端口配置
    • US5715197A
    • 1998-02-03
    • US687902
    • 1996-07-29
    • Scott S. NanceDouglas P. SheppardNicholas J. Sawyer
    • Scott S. NanceDouglas P. SheppardNicholas J. Sawyer
    • G11C7/10G11C13/00
    • G11C7/1006
    • A RAM with programmable data port configuration provides for programmable configuration of RAM data ports, and in the case of a multiport RAM, for independent programmable configuration of each data port. A single programmable RAM cell can be utilized in a variety of data port configurations, thereby reducing the number of combinations necessary in a standard cell library or gate array to implement the every possible configuration. In one embodiment of the invention, a dual port RAM is provided with a decoder, an input multiplexer and an output multiplexer for each data port. The input multiplexer for each data port provides several different selectable mappings of a RAM input word of varying sizes to the input bit lines of the respective data port. Similarly, the output multiplexer for each data port provides several different selectable mappings of the RAM output bit lines to the RAM output word. The decoder receives configuration programming bits to determine the appropriate size of the RAM input and output word for the respective port, and based on column addressing bits, outputs a select signal to select the appropriate mapping from the input and output multiplexers. Decoding circuitry is used during RAM write operations to disable those input bits not addressed.
    • 具有可编程数据端口配置的RAM提供RAM数据端口的可编程配置,并且在多端口RAM的情况下,用于每个数据端口的独立可编程配置。 可以在各种数据端口配置中使用单个可编程RAM单元,从而减少标准单元库或门阵列中所需的组合的数量,以实现每个可能的配置。 在本发明的一个实施例中,双端口RAM提供有解码器,输入多路复用器和用于每个数据端口的输出多路复用器。 每个数据端口的输入多路复用器提供与各个数据端口的输入位线不同大小的RAM输入字的几种不同的可选择的映射。 类似地,每个数据端口的输出多路复用器提供RAM输出位线到RAM输出字的几种不同的可选择的映射。 解码器接收配置编程位以确定相应端口的RAM输入和输出字的适当大小,并且基于列寻址位,输出选择信号以从输入和输出多路复用器选择适当的映射。 在RAM写操作期间使用解码电路来禁用未寻址的输入位。
    • 7. 再颁专利
    • Multiport RAM with programmable data port configuration
    • 多端口RAM,具有可编程数据端口配置
    • USRE40423E1
    • 2008-07-08
    • US09858635
    • 2001-05-15
    • Scott S. NanceDouglas P. SheppardNicholas J. Sawyer
    • Scott S. NanceDouglas P. SheppardNicholas J. Sawyer
    • G11C16/04
    • G11C7/1006
    • A RAM with programmable data port configuration provides for programmable configuration of RAM data ports, and in the case of a multiport RAM, for independent programmable configuration of each data port. A single programmable RAM cell can be utilized in a variety of data port configurations, thereby reducing the number of combinations necessary in a standard cell library or gate array in implement the every possible configuration. In one embodiment of the invention, a dual port RAM is provided with a decoder, an input multiplexer and an output multiplexer for each data port. The input multiplexer for each data port provides several different selectable mappings of a RAM input word of varying sizes to the input bit lines of the respective data port. Similarly, the output multiplexer for each data port provides several different selectable mappings of the RAM output bit lines to the RAM output word. The decoder receives configuration programming bits to determine the appropriate size of the RAM input and output word for the respective port, and based on column addressing bits, outputs a select signal to select the appropriate mapping from the input and output multiplexers. Decoding circuitry is used during RAM write operations to disable those input bits not addressed.
    • 具有可编程数据端口配置的RAM提供RAM数据端口的可编程配置,并且在多端口RAM的情况下,用于每个数据端口的独立可编程配置。 单个可编程RAM单元可以用于各种数据端口配置,从而减少标准单元库或门阵列中实现所有可能配置所需组合的数量。 在本发明的一个实施例中,双端口RAM提供有解码器,输入多路复用器和用于每个数据端口的输出多路复用器。 每个数据端口的输入多路复用器提供与各个数据端口的输入位线不同大小的RAM输入字的几种不同的可选择的映射。 类似地,每个数据端口的输出多路复用器提供RAM输出位线到RAM输出字的几种不同的可选择的映射。 解码器接收配置编程位以确定相应端口的RAM输入和输出字的适当大小,并且基于列寻址位,输出选择信号以从输入和输出多路复用器选择适当的映射。 在RAM写操作期间使用解码电路来禁用未寻址的输入位。
    • 8. 发明授权
    • Single-sided RAM cell and method of accessing same
    • 单面RAM单元及其访问方式
    • US5877979A
    • 1999-03-02
    • US884369
    • 1997-06-26
    • Richard C. LiHy V. NguyenScott S. Nance
    • Richard C. LiHy V. NguyenScott S. Nance
    • G11C11/412G11C11/00
    • G11C11/412
    • A memory system having a single-sided memory cell, a first voltage supply terminal and a control circuit is provided. The single-sided memory cell has a first node and a second node. Data values are written to the memory cell by selectively applying data signals to the first node or the second node, and data values are read from the memory cell from the second node. The control circuit is coupled to receive a data signal having one of a first state and a second state. The control circuit couples the first node of the memory cell to the first voltage supply terminal when the data signal is in the first state, thereby writing a first data value to the memory cell. The control circuit couples the second node of the memory cell to the first voltage supply terminal when the data signal is in the second state, thereby writing a second data value to the memory cell. Because the first voltage supply terminal is used to write both the first and second data values to the memory cell, problems associated with inadequate write voltages are eliminated by appropriate selection of the first supply voltage.
    • 提供具有单面存储单元,第一电压供应端子和控制电路的存储器系统。 单面存储单元具有第一节点和第二节点。 通过选择性地将数据信号应用于第一节点或第二节点,将数据值写入存储器单元,并且从第二节点从存储器单元读取数据值。 控制电路被耦合以接收具有第一状态和第二状态之一的数据信号。 当数据信号处于第一状态时,控制电路将存储单元的第一节点耦合到第一电压提供端,从而将第一数据值写入存储单元。 当数据信号处于第二状态时,控制电路将存储单元的第二节点耦合到第一电压供应端,从而将第二数据值写入存储单元。 因为第一电压供应端用于将第一和第二数据值写入存储单元,所以通过适当地选择第一电源电压来消除与写入电压不足有关的问题。
    • 9. 发明授权
    • Programmable input/output circuit with pull-up bias control
    • 具有上拉偏置控制的可编程输入/输出电路
    • US6028450A
    • 2000-02-22
    • US40497
    • 1998-03-17
    • Scott S. Nance
    • Scott S. Nance
    • H03K19/003H03K19/0185
    • H03K19/00315
    • A programmable input/output (I/O) circuit for transmitting output signals on or receiving input signals from an I/O terminal, the I/O circuit including a pull-up transistor, a gate bias control circuit and a well bias control circuit, all being connected between Vcc and the I/O terminal. The gate bias control circuit connects the gate of the pull-up transistor to the I/O terminal and the well bias control circuit connects the bulk terminal of the pull-up transistor to the I/O terminal when the I/O circuit is in a 5V tolerant input mode. The gate bias control circuit connects the gate of the pull-up transistor to the system voltage source and the well bias control circuit connects the bulk terminal of the pull-up transistor to Vcc when the I/O circuit is in a PCI compliant input mode. In an output mode, the gate bias control circuit and well bias control circuit allow the pull-up transistor to pull up the I/O terminal to Vcc in response to a pull-up data signal.
    • 一种用于在I / O端子上传输输入信号或从I / O端子接收输入信号的可编程输入/输出(I / O)电路,所述I / O电路包括上拉晶体管,栅极偏置控制电路和阱偏置控制电路 ,全部连接在Vcc和I / O端子之间。 栅极偏置控制电路将上拉晶体管的栅极连接到I / O端子,并且当I / O电路处于时,阱偏置控制电路将上拉晶体管的体端连接到I / O端子 5V容限输入模式。 栅极偏置控制电路将上拉晶体管的栅极连接到系统电压源,并且当I / O电路处于PCI兼容输入模式时,阱偏置控制电路将上拉晶体管的体端连接到Vcc 。 在输出模式中,栅极偏置控制电路和阱偏置控制电路允许上拉晶体管响应于上拉数据信号将I / O端子上拉至Vcc。