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    • 9. 发明授权
    • Video game and personal computer
    • 视频游戏和个人电脑
    • US4777621A
    • 1988-10-11
    • US756910
    • 1985-07-19
    • Jay G. MinerJoseph C. DecuirRonald H. Nicholson
    • Jay G. MinerJoseph C. DecuirRonald H. Nicholson
    • G06F13/28G09G1/16G09G5/00G06F9/00
    • G09G5/001G06F13/28G09G5/005G09G5/393G09G5/395G09G2360/126G09G2360/18
    • A video game home computer is implemented in NMOS (n type metal oxide semiconductor) technology with plural microprocessors. Centralized bus architecture and direct memory access (DMA) techniques are employed. A video display generator provides color signal outputs to drive a commercial television receiver display. This display generator receives inputs from both microprocessors and obtains data directly from memory. A bit map of display information is kept in memory, wherein bits of information in memory image the precise screen display for each instance in time. A bit map manipulator circuit performs, under microprocessor direction, logic function manipulation of the bit map data. Access between system components is accomplished via the bus architecture on a priority queue basis. Chip count and chip area is minimized.
    • 视频游戏家用计算机在具有多个微处理器的NMOS(n型金属氧化物半导体)技术中实现。 采用集中式总线架构和直接存储器访问(DMA)技术。 视频显示发生器提供彩色信号输出以驱动商业电视接收机显示。 该显示生成器接收来自两个微处理器的输入并直接从存储器获取数据。 显示信息的位图保存在存储器中,其中存储器中的信息位在时间上针对每个实例精确地显示屏幕。 位图操纵器电路在微处理器方向下执行位图数据的逻辑功能操作。 通过基于优先级队列的总线架构来实现系统组件之间的访问。 芯片数量和芯片面积最小化。
    • 10. 发明授权
    • System and method for a switched data bus termination
    • 用于切换数据总线终端的系统和方法
    • US5781028A
    • 1998-07-14
    • US668287
    • 1996-06-21
    • Joseph C. Decuir
    • Joseph C. Decuir
    • H03K19/0175H04L25/02H03K17/16
    • H04L25/0278H03K19/01759H04L25/0292H04L5/16H04L25/028
    • A bidirectional universal serial bus (USB) includes switched terminations that are selectively activated to terminate the receiving end of the data bus in its characteristic impedance. The USB includes a twisted pair data cable that permits bidirectional data communication between a USB interface in a computer and a USB peripheral device. To control the bidirectional communication, the USB defines a transmit mode and a receive mode. Each end of the twisted pair data cable includes a selectively activatable switch termination that terminates the twisted pair data cable in its characteristic impedance when selectively activated. When the USB peripheral device is in the receive mode, the switched termination within the USB peripheral device is selectively activated so that the twisted pair data cable is terminated in its characteristic impedance. This reduces ringing and electromagnetic (EM) radiation on the twisted pair data cable. The switched termination within the USB interface in the computer is not activated when the USB interface is in the transmit mode. If the USB peripheral is placed in the transmit mode, and the USB interface in the computer is placed in the receive mode, the switched termination within the USB interface in the computer is selectively activated while the switched termination within the USB peripheral is placed in an inactive state. In this manner, the twisted pair data cable is always terminated in the proper impedance only at the receiving end.
    • 双向通用串行总线(USB)包括切换终端,其被选择性地激活以在其特征阻抗中终止数据总线的接收端。 USB包括双绞线数据电缆,允许计算机中的USB接口与USB外围设备之间进行双向数据通信。 为了控制双向通信,USB定义了发送模式和接收模式。 双绞线数据电缆的每一端包括一个可选择性激活的开关终端,当选择性地激活时,双绞线数据电缆在其特性阻抗中终止。 当USB外围设备处于接收模式时,选择性地激活USB外围设备内的切换终端,使得双绞线数据电缆以特征阻抗终止。 这减少了双绞线数据线上的振铃和电磁辐射。 当USB接口处于发送模式时,计算机USB接口内的切换终端不会被激活。 如果USB外围设备处于发送模式,并且计算机中的USB接口处于接收模式,那么选择性地激活计算机USB接口内的切换终端,同时将USB外设中的切换终端置于 不活动状态。 以这种方式,双绞线数据电缆总是仅在接收端终止于适当的阻抗。