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    • 22. 发明授权
    • Circuit for providing clock signals with low skew
    • 提供低偏移时钟信号的电路
    • US06731142B1
    • 2004-05-04
    • US10412705
    • 2003-04-10
    • Bonnie WangChiakang SungKhai NguyenJoseph HuangXiaobao WangIn Whan KimGopi RanganYan ChongPhillip PanTzung-Chin Chang
    • Bonnie WangChiakang SungKhai NguyenJoseph HuangXiaobao WangIn Whan KimGopi RanganYan ChongPhillip PanTzung-Chin Chang
    • H03K2100
    • H03M9/00G06F1/08H03K5/135
    • A digital, preferably programmable, circuit is disclosed for providing one or more clock signals with variable frequency and/or phase. The clock signals exhibit a low amount of skew relative to other clock signals and data signals provided by the circuit. In one embodiment, the circuit includes a plurality of channels each having a parallel-in/serial-out shift register, a flip-flop, and a delay circuit. The shift register can receive data bits in data channels or clock frequency select bits in frequency-divided clock channels. The serial output from the register acts as an input for the flip flop, both of which are triggered by an input reference clock. The delay circuit delays the input reference clock. In each channel, a multiplexer is configured to select the clock or data channel output from the register, flip-flop, and delay circuit outputs. Since the delays in all output paths are matched, skew is minimized.
    • 公开了一种数字,优选可编程的电路,用于提供具有可变频率和/或相位的一个或多个时钟信号。 时钟信号相对于由该电路提供的其它时钟信号和数据信号呈现低的偏移量。 在一个实施例中,电路包括多个通道,每个通道具有并行/串行输出移位寄存器,触发器和延迟电路。 移位寄存器可以在分频时钟通道中的数据通道或时钟频率选择位中接收数据位。 来自寄存器的串行输出用作触发器的输入,两者均由输入参考时钟触发。 延迟电路延迟输入参考时钟。 在每个通道中,多路复用器被配置为选择从寄存器,触发器和延迟电路输出输出的时钟或数据通道。 由于所有输出路径中的延迟相匹配,所以偏斜最小化。
    • 24. 发明授权
    • Circuit for providing clock signals with low skew
    • 提供低偏移时钟信号的电路
    • US06549045B1
    • 2003-04-15
    • US10043620
    • 2002-01-11
    • Bonnie WangChiakang SungKhai NguyenJoseph HuangXiaobao WangIn Whan KimGopi RanganYan ChongPhillip PanTzung-Chin Chang
    • Bonnie WangChiakang SungKhai NguyenJoseph HuangXiaobao WangIn Whan KimGopi RanganYan ChongPhillip PanTzung-Chin Chang
    • H03K2100
    • H03M9/00G06F1/08H03K5/135
    • A digital, preferably programmable, circuit is disclosed for providing one or more clock signals with variable frequency and/or phase. The clock signals exhibit a low amount of skew relative to other clock signals and data signals provided by the circuit. In one embodiment, the circuit includes a plurality of channels each having a parallel-in/serial-out shift register, a flip-flop, and a delay circuit. The shift register can receive data bits in data channels or clock frequency select bits in frequency-divided clock channels. The serial output from the register acts as an input for the flip flop, both of which are triggered by an input reference clock. The delay circuit delays the input reference clock. In each channel, a multiplexer is configured to select the clock or data channel output from the register, flip-flop, and delay circuit outputs. Since the delays in all output paths are matched, skew is minimized.
    • 公开了一种数字,优选可编程的电路,用于提供具有可变频率和/或相位的一个或多个时钟信号。 时钟信号相对于由该电路提供的其它时钟信号和数据信号呈现低的偏移量。 在一个实施例中,电路包括多个通道,每个通道具有并行/串行输出移位寄存器,触发器和延迟电路。 移位寄存器可以在分频时钟通道中的数据通道或时钟频率选择位中接收数据位。 来自寄存器的串行输出用作触发器的输入,两者均由输入参考时钟触发。 延迟电路延迟输入参考时钟。 在每个通道中,多路复用器被配置为选择从寄存器,触发器和延迟电路输出输出的时钟或数据通道。 由于所有输出路径中的延迟相匹配,所以偏斜最小化。
    • 27. 发明授权
    • Techniques for providing multiple delay paths in a delay circuit
    • 在延迟电路中提供多个延迟路径的技术
    • US07893739B1
    • 2011-02-22
    • US12549332
    • 2009-08-27
    • Pradeep NagarajanYan ChongChiakang SungJoseph Huang
    • Pradeep NagarajanYan ChongChiakang SungJoseph Huang
    • H03L7/06
    • H03L7/0814H03K5/133H03K2005/00058
    • A feedback loop circuit includes a phase detector and delay circuits. The phase detector generates an output signal based on a delayed periodic signal. The delay circuits are coupled in a delay chain that delays the delayed periodic signal. Each of the delay circuits includes variable delay blocks and fixed delay blocks that are coupled to form at least two delay paths for an input signal through the delay circuit to generate a delayed output signal. Delays of the variable delay blocks in the delay circuits vary based on the output signal of the phase detector. Each of the delay circuits reroutes the input signal through a different one of the delay paths to generate the delayed output signal based on the output signal of the phase detector during operation of the feedback loop circuit.
    • 反馈回路包括相位检测器和延迟电路。 相位检测器基于延迟周期信号产生输出信号。 延迟电路在延迟链中耦合,延迟链延迟了延迟的周期信号。 每个延迟电路包括可变延迟块和固定延迟块,其被耦合以形成用于通过延迟电路的输入信号的至少两个延迟路径以产生延迟的输出信号。 延迟电路中的可变延迟块的延迟基于相位检测器的输出信号而变化。 每个延迟电路通过不同的一个延迟路径重新路由输入信号,以在反馈回路电路的操作期间基于相位检测器的输出信号产生延迟的输出信号。
    • 29. 发明申请
    • WRITE-LEVELING IMPLEMENTATION IN PROGRAMMABLE LOGIC DEVICES
    • 可编程逻辑器件中的写层次实现
    • US20080201597A1
    • 2008-08-21
    • US11843123
    • 2007-08-22
    • Yan ChongBonnie I. WangChiakang SungJoseph HuangMichael H.M. Chu
    • Yan ChongBonnie I. WangChiakang SungJoseph HuangMichael H.M. Chu
    • G06F1/12H04L7/00
    • G11C7/22G11C7/1066G11C7/222
    • Circuits, methods, and apparatus for memory interfaces that compensate for skew between a clock signal and DQ/DQS signals that may be caused by a fly-by routing topology. The skew is compensated by clocking the DQ/DQS signals with a phase delayed clock signal, where the phase delay has been calibrated. In one example calibration routine, a clock signal is provided to a receiving device. A DQ/DQS signal is also provided and the timing of their reception compared. A delay of the DQ/DQS signal is changed incrementally until the DQ/DQS signal is aligned with the clock signal at the receiving device. This delay is then used during device operation to delay a signal that clocks registers providing the DQ/DQS signals. Each DQ/DQS group can be aligned to the clock, or the DQS and DQ signals in a group may be independently aligned to the clock at the receiving device.
    • 用于存储器接口的电路,方法和装置,其补偿可能由飞越路由拓扑引起的时钟信号和DQ / DQS信号之间的偏差。 通过使用相位延迟时钟信号对DQ / DQS信号进行时钟补偿,其中相位延迟已校准。 在一个示例性校准例程中,向接收设备提供时钟信号。 还提供了DQ / DQS信号,并将其接收的定时进行比较。 DQ / DQS信号的延迟逐渐改变,直到DQ / DQS信号与接收设备的时钟信号对齐。 然后在器件操作期间使用该延迟来延迟提供DQ / DQS信号的寄存器的信号。 每个DQ / DQS组可以与时钟对齐,或者组中的DQS和DQ信号可以独立地对准接收器件上的时钟。