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    • 28. 发明授权
    • Destage of data for write cache
    • 写入缓存的数据流出
    • US06192450B1
    • 2001-02-20
    • US09018175
    • 1998-02-03
    • Ellen Marie BaumanRobert Edward GalbraithMark A. Johnson
    • Ellen Marie BaumanRobert Edward GalbraithMark A. Johnson
    • G06F1200
    • G06F12/0804G06F12/0866
    • Data in a write cache is coalesced together prior to each destage operation. This results in higher performance by destaging a large quantity of data from the cache with each destage operation. A root item of data is located, and then a working set of data is collected by identifying additional data in the cache that will be destaged to locations in the storage device adjacent to the root item of data. The root item of data may be identified by starting at the location of the least recently accessed data in the cache, and then selecting a root item of data at a lower storage device address than the least recently accessed data, or may be chosen from a larger than average group of data items that were stored together into the cache. To speed execution, data items are added to a working set by, where possible, scanning an queue of data items kept in access order to locate data items at adjacent storage locations.
    • 写入高速缓存中的数据在每次卸载操作之前合并在一起。 这将导致通过每次卸载操作从高速缓存中降级大量数据而导致更高的性能。 找到一个根数据项,然后通过识别高速缓存中的附加数据来收集一组工作数据,这些附加数据将被转发到与数据根数据相邻的存储设备中的位置。 可以通过从高速缓存中最近访问的数据的位置开始,然后在低于最近访问的数据的较低存储设备地址处选择数据的根项来识别数据的根项,或者可以从 大于平均存储在缓存中的一组数据项。 为了加快执行速度,通过在可能的情况下扫描以访问顺序保持的数据项队列来将数据项添加到工作集中,以在相邻存储位置定位数据项。
    • 29. 发明授权
    • Smart electronic muzzle reference light source
    • 智能电子枪口参考光源
    • US6072400A
    • 2000-06-06
    • US368466
    • 1999-07-15
    • Mark A. JohnsonPaul J. Cote
    • Mark A. JohnsonPaul J. Cote
    • F41A1/00G08B3/00
    • F41A1/00
    • An electronic light source which replaces the hazardous tritium light sou used in the existing Muzzle Reference System (MRS) found on the M1 Series of tanks. The MRS is mounted near the muzzle end of the gun (opposite the breech) and is used by tank gunness to measure gun deflection for calibration of the tank's fire control computer to optimize accuracy. The electronic light source is an LED which is activated by the pulses from a microcontroller based on the input received from a small, low power, omnidirectional motion sensor which detects the movement of the tank mounted on the tank. In the current implementation, the motion sensor comprises a conductive rolling sphere in a cylindrical chamber having a conductive wall with one electrical pole and end plates electrically insulated from the conductive wall and having the other electrical pole such that movement of the element caused by movement of the cylinder will generate intermittent electrical contact between one end plate and the cylinder wall. The signals produced are fed to the microcontroller which through the operation of its oscillator energizes the LED. The oscillator frequency is selected to eliminate EMI detection. The activation of the LED is prepared in such a manner to extend battery lite by minimizing power drain, a thermometer is employed for temperature control of the LED and other electronic circuit elements.
    • 一种电子光源,代替在M1系列坦克上发现的现有枪支参考系(MRS)中使用的危险氚光源。 MRS安装在枪口(枪口对面)的枪口附近,并通过坦克炮使用来测量枪偏转,以校准坦克的消防控制计算机以优化精度。 电子光源是由微控制器的脉冲基于从小的,低功率的全向运动传感器接收的输入激活的LED,其检测安装在罐上的罐的运动。 在当前的实现中,运动传感器包括在圆柱形腔室中的导电滚动球体,其具有导电壁,该导电壁具有一个电极和与导电壁电绝缘的端板,并且具有另一个电极,使得元件的移动 气缸将在一个端板和气缸壁之间产生间歇性电接触。 产生的信号馈送到微控制器,通过其振荡器的操作激励LED。 选择振荡器频率以消除EMI检测。 LED的激活以通过最小化功率消耗来延长电池容量的方式制备,温度计用于LED和其它电子电路元件的温度控制。
    • 30. 发明授权
    • DMA configurable channel with memory width N and with steering logic
comprising N multiplexors, each multiplexor having a single one-byte
input and N one-byte outputs
    • 具有存储器宽度N的DMA可配置通道,并且具有包括N个多路复用器的导向逻辑,每个多路复用器具有单个单字节输入和N个一字节输出
    • US6065070A
    • 2000-05-16
    • US40588
    • 1998-03-18
    • Mark A. Johnson
    • Mark A. Johnson
    • G06F13/28G06F13/00G06F12/00G06F13/38G06F13/40
    • G06F13/28
    • A descriptor controlled transmit and receive scatter/gather Direct Memory Access Controller efficiently moves data frames comprised of scattered blocks of data from within memory to a destination interface via a multibyte-wide buffer. The transfer of frames into a transmit buffer and out of a receive buffer is optimized regardless of the total length of the component data blocks and regardless of whether the data blocks include an odd or even number of bytes, whether the data blocks begin at an odd or even address, or whether the data blocks are misaligned with regard to memory width boundaries. A DMAC in accordance with an embodiment of the present invention stores information provided by a descriptor before frame processing takes place. This information in conjunction with steering logic and accumulator registers is used to control the steering and storing of the frame data as it passes through the DMAC to the transmit buffer or from the receive buffer. An alternate embodiment of the present invention performs these functions based on the present values of the descriptor fields. Using predetermined data block descriptor information, the present invention is able to determine on the fly the most efficient way to arrange the bytes of data within the data buffers or memory and concatenate the component data buffers in a buffer or memory to assemble the frames, while inserting frame delineating control words to circumvent the necessity for logic to keep track of these boundaries. The use of the descriptor to steer the data into the transmit buffer or out of the receive buffer allows a simplified hardware implementation as compared to prior art methods that must examine and count the data as it is transferred.
    • 描述符控制的发送和接收分散/收集直接存储器访问控制器通过多字节宽缓冲器有效地将由分散的数据块组成的数据帧从存储器内移动到目的地接口。 无论数据块的总长度如何,无论数据块是否包含奇数或偶数个字节,数据块是否以奇数开始,都将帧传输到发送缓冲区中并且从接收缓冲区传输 或甚至地址,或者数据块是否相对于存储器宽度边界而不对准。 根据本发明的实施例的DMAC存储在帧处理发生之前由描述符提供的信息。 该信息结合转向逻辑和累加器寄存器用于控制帧数据在通过DMAC到发送缓冲器或从接收缓冲器时的转向和存储。 本发明的替代实施例基于描述符字段的当前值来执行这些功能。 使用预定的数据块描述符信息,本发明能够飞行地确定将数据字节排列在数据缓冲器或存储器内的最有效的方式,并将组件数据缓冲器连接在缓冲器或存储器中以组合帧,同时 插入框架描绘控制字以规避逻辑跟踪这些边界的必要性。 与现有技术方法相比,使用描述符将数据引导到发送缓冲器或从接收缓冲器中允许简化的硬件实现,这些方法必须在数据被传送时检查和计数。