发明申请
US20080143375A1 METHOD FOR REDUCING CROSS-TALK INDUCED SOURCE SYNCHRONOUS BUS CLOCK JITTER
失效
用于减少交叉输入源同步总线时钟抖动的方法
- 专利标题: METHOD FOR REDUCING CROSS-TALK INDUCED SOURCE SYNCHRONOUS BUS CLOCK JITTER
- 专利标题(中): 用于减少交叉输入源同步总线时钟抖动的方法
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申请号: US11611200申请日: 2006-12-15
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公开(公告)号: US20080143375A1公开(公告)日: 2008-06-19
- 发明人: Bao G. Truong , Daniel Mark Dreps , Anand Haridass , John C. Schiff , Joel D. Ziegelbein
- 申请人: Bao G. Truong , Daniel Mark Dreps , Anand Haridass , John C. Schiff , Joel D. Ziegelbein
- 主分类号: H03K19/00
- IPC分类号: H03K19/00 ; H03K19/003
摘要:
A first clock signal of frequency F is used to couple data to an off-chip driver (OCD) using a master/slave flip flop (FF), wherein the master latch is clocked with the first clock signal and the slave latch is clocked with the complement of the first clock signal. A second clock signal of frequency F/2 is generated from the first clock signal. The second clock signal is shifted a time equal to substantially one-half the cycle of the first clock signal. In one embodiment, the second clock is shifted using a delay line circuit. In another embodiment, the second clock is shifted using a master/slave FF, wherein the master latch is clocked with the complement of the first clock signal and the slave latch is clocked with the first clock signal. The logic state transitions of the data between edges of the propagating clock thereby reducing coupling to the clock transitions and thus reducing edge jitter.
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