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    • 9. 发明授权
    • PS/2 to USB keyboard adaptor supporting N-key rollover
    • PS / 2支持N键翻转的USB键盘适配器
    • US08260988B2
    • 2012-09-04
    • US12475088
    • 2009-05-29
    • Dang Sheng CaoChang-Ti SungWen Zhang
    • Dang Sheng CaoChang-Ti SungWen Zhang
    • G06F13/12G06F3/00
    • G06F3/023G06F13/387G06F2213/0042
    • A USB converter circuit for converting electrical signals from a key scan circuit (in PS/2 or other formats) into USB signals for a computer while supporting N-key rollover (NKRO) functions. The converter circuit can be implemented as a stand-alone PS/2 to USB keyboard converter or as an integral component of a USB keyboard or KVM switch. The converter circuit includes a converter module that generates keyboard data packets in the USB format having a 16-byte, 64-byte, etc. format representing key press information for up to 8 modifier keys and 14, 62, etc. non-modifier keys, respectively. The converter circuit also includes a USB device controller module which transmits the 16-byte etc. USB keyboard data as one or multiple USB data packets to the host computer. When multiple USB data packets are needed to transmit each keyboard data packet (depending on the USB speed), they are transmitted in consecutive polling periods.
    • USB转换器电路,用于将电子信号从键扫描电路(PS / 2或其他格式)转换为计算机的USB信号,同时支持N键翻转(NKRO)功能。 转换器电路可以实现为独立的PS / 2至USB键盘转换器或USB键盘或KVM切换器的组成部分。 转换器电路包括转换器模块,其以USB格式生成具有16字节,64字节等格式的键盘数据分组,其表示用于多达8个修改键的键按压信息,以及14,62等非修饰键 , 分别。 转换器电路还包括USB设备控制器模块,其将16字节等USB键盘数据作为一个或多个USB数据分组发送到主计算机。 当需要多个USB数据包来传输每个键盘数据包(取决于USB速度)时,它们将以连续的轮询周期传输。