公开(公告)号：US07340550B2

公开(公告)日：2008-03-04

申请号：US11004011

申请日：2004-12-02

Applicant: Michael N. Derr ,  John Howard ,  Darren Abramson ,  Leslie E. Cline ,  Rob Strong

Inventor： Michael N. Derr ,  John Howard ,  Darren Abramson ,  Leslie E. Cline ,  Rob Strong

IPC: G06F13/36 ,  G06F1/00

CPC classification number: G06F13/28 ,  G06F2213/0042 ,  Y02D10/14

Abstract: A circuit for monitoring future Universal Serial Bus (USB) activities is described. Specifically, the circuit may comprise a Direct Memory Access (DMA) engine schedule prefetcher. The DMA engine schedule prefetcher accesses linked list schedule structures in main memory. The structures are checked for future frames where the linked list has USB activity scheduled. A periodic DMA engine subsequently accesses main memory only during frames where USB traffic is scheduled.

Abstract translation: 描述了用于监控未来通用串行总线（USB）活动的电路。 具体地，电路可以包括直接存储器访问（DMA）引擎调度预取器。 DMA引擎调度预取器访问主内存中的链表列表调度结构。 对结构进行检查，以便链接列表安排USB活动的将来帧。 周期性DMA引擎随后仅在安排USB流量的帧期间访问主存储器。

公开(公告)号：US20060123180A1

公开(公告)日：2006-06-08

申请号：US11004011

申请日：2004-12-02

Applicant: Michael Derr ,  John Howard ,  Darren Abramson ,  Leslie Cline ,  Rob Strong

Inventor： Michael Derr ,  John Howard ,  Darren Abramson ,  Leslie Cline ,  Rob Strong

IPC: G06F13/36

CPC classification number: G06F13/28 ,  G06F2213/0042 ,  Y02D10/14

Abstract: A circuit for monitoring future Universal Serial Bus (USB) activities is described. Specifically, the circuit may comprise a Direct Memory Access (DMA) engine schedule prefetcher. The DMA engine schedule prefetcher accesses linked list schedule structures in main memory. The structures are checked for future frames where the linked list has USB activity scheduled. A periodic DMA engine subsequently accesses main memory only during frames where USB traffic is scheduled.

Abstract translation: 描述了用于监控未来通用串行总线（USB）活动的电路。 具体地，电路可以包括直接存储器访问（DMA）引擎调度预取器。 DMA引擎调度预取器访问主内存中的链表列表调度结构。 对结构进行检查，以便链接列表安排USB活动的未来帧。 周期性DMA引擎随后仅在安排USB流量的帧期间访问主存储器。