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    • 4. 发明授权
    • DMA controller which can be controlled by host and local processors
    • DMA控制器,可由主机和本地处理器控制
    • US5812876A
    • 1998-09-22
    • US780019
    • 1996-12-20
    • Mark W. WelkerJohn S. Thayer
    • Mark W. WelkerJohn S. Thayer
    • G06F13/28G06F13/40G06F15/02
    • G06F13/28G06F13/4013G06F13/4036
    • A computer system which includes a DMA controller on the local I/O unit which can be programmed by either the host processor or the local processor. Semaphore flags and lock bits are provided to allow determination of control of the local DMA controller and for passing information. Additionally, data alignment and padding circuitry is provided. The circuitry is informed of the logical data arrangement desired or utilized by the host processor or other devices and knows the data arrangement of the local processor. The circuitry properly obtains and realigns the data based on the transfer direction and data arrangement. The circuitry further properly zero pads the data when realignment is such that padding is necessary.
    • 一种计算机系统,其包括本地I / O单元上的DMA控制器,可由主机处理器或本地处理器进行编程。 提供信号标志和锁定位以允许确定本地DMA控制器的控制和传递信息。 另外,提供数据对准和填充电路。 电路被通知主处理器或其他设备所期望或利用的逻辑数据布置,并且知道本地处理器的数据排列。 电路根据传输方向和数据排列顺序获取和重新排列数据。 当重新对准使得填充是必要的时,电路进一步适当地对数据进行填补。
    • 5. 发明授权
    • Avoiding non-unique identifiers for bus devices
    • 避免总线设备的非唯一标识符
    • US5892929A
    • 1999-04-06
    • US777230
    • 1996-12-30
    • Mark W. Welker
    • Mark W. Welker
    • G06F12/06G06F13/376
    • G06F12/0669G06F12/0661
    • A method and apparatus of assuring uniqueness of identification numbers of bus devices connected to a bus. Each bus device has a current identification number. At each of the bus devices, an identification number is received on a bus and the bus is contended for based on the received identification number. If more than one bus device is detected contending for the bus, the current identification number of one of the bus devices is changed. Each of the bus devices compares the received identification number to the current identification number of the bus device. A bus device provides a match indication, including driving a signal, if the comparison produces a match. Each bus device includes a collision detector for detecting if more than one bus device is driving the signal.
    • 确保连接到总线的总线设备的识别号的唯一性的方法和装置。 每个总线设备具有当前标识号。 在每个总线装置上,在总线上接收识别号码,并根据所接收的标识号码对总线进行竞争。 如果检测到总线上有多个总线设备,则总线设备之一的当前标识号被改变。 每个总线装置将接收到的标识号与总线装置的当前标识号进行比较。 如果比较产生匹配,则总线装置提供匹配指示,包括驱动信号。 每个总线装置包括用于检测多于一个总线装置正在驱动该信号的碰撞检测器。