发明授权
US08964919B2 System and method for determining a time for safely sampling a signal of a clock domain
有权
用于确定用于安全采样时钟域的信号的时间的系统和方法
- 专利标题: System and method for determining a time for safely sampling a signal of a clock domain
- 专利标题(中): 用于确定用于安全采样时钟域的信号的时间的系统和方法
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申请号: US13674864申请日: 2012-11-12
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公开(公告)号: US08964919B2公开(公告)日: 2015-02-24
- 发明人: Stephen G. Tell
- 申请人: NVIDIA Corporation
- 申请人地址: US CA Santa Clara
- 专利权人: NVIDIA Corporation
- 当前专利权人: NVIDIA Corporation
- 当前专利权人地址: US CA Santa Clara
- 代理机构: Zilka-Kotab, PC
- 主分类号: H04L7/00
- IPC分类号: H04L7/00 ; G06F5/10 ; G06F7/499
摘要:
A system and method are provided for determining a time for safely sampling a signal of a clock domain. In one embodiment, a phase estimate of a first clock domain is calculated based on a relative frequency estimate between a second clock domain and the first clock domain and, based on the phase estimate, a first time during which a signal from the first clock domain is unchanging such that the signal is capable of being safely sampled by the second clock domain is determined to generate a first sampled signal in the second clock domain. Additionally, an updated phase estimate is calculated, and, based on the updated phase estimate, a second time during which the signal from the first clock domain is changing such that the signal is not capable of being safely sampled by the second clock domain is determined. During the second time the first sampled signal in the second clock domain is maintained.
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