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    • 164. 发明授权
    • Jitter-free divider
    • 无抖动分频器
    • US07813466B2
    • 2010-10-12
    • US12405905
    • 2009-03-17
    • Yu HuangWei Fu
    • Yu HuangWei Fu
    • H03K21/00
    • H03K23/68
    • A system and method are provided for jitter-free fractional division. The method accepts a first plurality of first signal phases, each phase having a first frequency. To make the division jitter-free, a phase is selected subsequent to deselecting a previous phase selection. The selected phase is divided by the integer N, supplying a second signal with a second frequency. Using the second signal as a clock, a first plurality of counts is triggered in series, and the counts are used to select a corresponding phase. The first signal may separate neighboring phases by 90 degrees. Then, for (N+0.25), a first count triggers a second count and selects the first phase, the second count triggers a third count and selects the second phase, the third count triggers a fourth count and selects the third phase, and the fourth count trigger the first count and selects the fourth phase.
    • 提供了一种用于无抖动分数除法的系统和方法。 该方法接受第一多个第一信号相位,每个相位具有第一频率。 为了使分频无抖动,在取消选择先前的相位选择之后选择相位。 所选择的相位除以整数N,提供具有第二频率的第二信号。 使用第二信号作为时钟,串联地触发第一多个计数,并且使用计数来选择相应的相位。 第一个信号可以将相邻相位分离90度。 然后,对于(N + 0.25),第一计数触发第二计数并选择第一相位,第二计数触发第三计数并选择第二相位,第三计数触发第四计数并选择第三相,并且 第四计数触发第一个计数并选择第四个阶段。
    • 167. 发明申请
    • PRD (PHYSICAL REGION DESCRIPTOR) PRE-FETCH METHODS FOR DMA (DIRECT MEMORY ACCESS) UNITS
    • 用于DMA(直接存储器访问)单元的PRE-FETCH方法(物理区域描述符)
    • US20080320176A1
    • 2008-12-25
    • US11935429
    • 2007-11-06
    • Peng GaoYu HuangDejian Li
    • Peng GaoYu HuangDejian Li
    • G06F13/28
    • G06F13/28G06F12/0875
    • PRD (Physical Region Descriptor) pre-fetch methods for DMA (Direct Memory Access) unit are provided. When a DMA out transaction for a memory is performed, it is determined whether a first queue is full or nearly full, wherein the first queue is used to store data corresponding to the DMA out transaction. If the first queue is full or nearly full, at least one PRD entry is read from a first PRD table, and stored to a first cache. When a DMA in transaction for the memory is performed, it is determined whether a second queue is empty or nearly empty, wherein the second queue is used to store data corresponding to the DMA in transaction. If the second queue is empty or nearly empty, at least one PRD entry is read from a second PRD table, and stored to a second cache.
    • 提供了用于DMA(直接存储器访问)单元的PRD(物理区域描述符)预取方法。 当执行用于存储器的DMA输出事务时,确定第一队列是否满或已满,其中第一队列用于存储对应于DMA输出事务的数据。 如果第一个队列已满或已满,则从第一个PRD表中读取至少一个PRD条目,并存储到第一个缓存。 当执行用于存储器的事务中的DMA时,确定第二队列是空还是几乎为空,其中第二队列用于在事务中存储对应于DMA的数据。 如果第二队列为空或几乎为空,则从第二PRD表读取至少一个PRD条目,并存储到第二高速缓存。