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    • 4. 发明申请
    • Universal serial bus keyboard control circuitry
    • 通用串行总线键盘控制电路
    • US20040080437A1
    • 2004-04-29
    • US10675942
    • 2003-10-02
    • I-Ming Lin
    • H03M011/00H03K017/94
    • H03M11/00
    • A keyboard control apparatus with a USB interface for use in a notebook computer having a number of keys. In one embodiment, a mapping unit is employed to store a number of key matrix codes corresponding to the keys. In accordance with a clock signal and a start signal, a shift register is capable of generating a reference signal and a number of scan output signals. A key matrix circuit then receives the scan output signals to provide a number of scan input signals. An address generator is used to generate an address signal based on the reference signal and a triggered scan input signal. Thus, a selector can select one key matrix code designated to the address signal from the mapping unit. Additionally, an interface converter further converts the selected key matrix code into a pair of differential signals compliant with the USB specification.
    • 一种具有用于具有多个键的笔记本计算机的USB接口的键盘控制装置。 在一个实施例中,使用映射单元来存储对应于密钥的多个密钥矩阵码。 根据时钟信号和起始信号,移位寄存器能够产生参考信号和多个扫描输出信号。 键矩阵电路然后接收扫描输出信号以提供多个扫描输入信号。 地址发生器用于基于参考信号和触发的扫描输入信号产生地址信号。 因此,选择器可以从映射单元中选择指定给地址信号的一个键矩阵代码。 此外,接口转换器还将所选择的按键矩阵代码转换为符合USB规范的一对差分信号。