发明授权
US06760392B1 Method and apparatus to provide fixed latency early response in a system with multiple clock domains with fixable clock ratios 失效
在具有可固定时钟比的多个时钟域的系统中提供固定延迟早期响应的方法和装置

  • 专利标题: Method and apparatus to provide fixed latency early response in a system with multiple clock domains with fixable clock ratios
  • 专利标题(中): 在具有可固定时钟比的多个时钟域的系统中提供固定延迟早期响应的方法和装置
  • 申请号: US09439191
    申请日: 1999-11-12
  • 公开(公告)号: US06760392B1
    公开(公告)日: 2004-07-06
  • 发明人: Teik-Chung TanBrian D. McMinn
  • 申请人: Teik-Chung TanBrian D. McMinn
  • 主分类号: H04L700
  • IPC分类号: H04L700
Method and apparatus to provide fixed latency early response in a system with multiple clock domains with fixable clock ratios
摘要:
A system and method for transferring data using an early response signal to indicate subsequent transmission of data after a fixed latency, wherein the signal and data are transferred from a first clock domain to a second clock domain using a clock skipping technique. In one embodiment, an early response signal is transmitted by a first device k clock pulses prior to transmission of the data. The receiving device, which is operating at a higher clock rate, receives the early response signal and delays the signal by the number of skipped pulses which will occur in the second clock domain before the occurrence of the kth valid pulse. The second device employs a skip pattern generator to generate a signal indicative of this number of skipped pulses and provides the number to a delay circuit which delays the early response signal for an this number of clock pulses. The delayed early response signal is then output to the appropriate logic to indicate the latency of the subsequent data transfer.
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