公开(公告)号：US06535031B1

公开(公告)日：2003-03-18

申请号：US10146438

申请日：2002-05-13

申请人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G Cliff ,  Joseph Huang ,  Bonnie I Wang ,  Wayne Yeung

发明人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G Cliff ,  Joseph Huang ,  Bonnie I Wang ,  Wayne Yeung

IPC分类号： H03K522

CPC分类号： H03K19/17744 ,  H03K19/018521 ,  H03K19/1778 ,  H03K19/17784

摘要： A programmable logic device is equipped for low voltage differential signaling (“LVDS”) by providing an LVDS input buffer and/or an LVDS output buffer on the device. I/O pins on the device that are used together in pairs for LVDS can alternatively be used individually for other types of signaling. The LVDS buffers are constructed to give good performance and to meet LVDS specifications despite variations due to temperature, manufacturing process inconsistency, and power supply changes.

公开(公告)号：US06400598B1

公开(公告)日：2002-06-04

申请号：US09843299

申请日：2001-04-25

申请人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G. Cliff ,  Joseph Huang ,  Bonnie I. Wang ,  Wayne Yeung

发明人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G. Cliff ,  Joseph Huang ,  Bonnie I. Wang ,  Wayne Yeung

IPC分类号： G11C506

CPC分类号： H03K19/17744 ,  H03K19/018521 ,  H03K19/1778 ,  H03K19/17784

摘要： A programmable logic device is equipped for low voltage differential signaling (“LVDS”) by providing an LVDS input buffer and/or an LVDS output buffer on the device. I/O pins on the device that are used together in pairs for LVDS can alternatively be used individually for other types of signaling. The LVDS buffers are constructed to give good performance and to meet LVDS specifications despite variations due to temperature, manufacturing process inconsistency, and power supply changes.

摘要翻译： 可编程逻辑器件通过在器件上提供LVDS输入缓冲器和/或LVDS输出缓冲器来配备低电压差分信号（“LVDS”）。 对于LVDS成对使用的设备上的I / O引脚可以单独用于其他类型的信令。 尽管由于温度，制造过程不一致以及电源变化而导致变化，LVDS缓冲器也可以提供良好的性能和满足LVDS规范。

公开(公告)号：US06346827B1

公开(公告)日：2002-02-12

申请号：US09366937

申请日：1999-08-04

申请人： Wayne Yeung ,  Chiakang Sung ,  Myron W. Wong ,  Khai Nguyen ,  Bonnie I. Wang ,  Xiaobao Wang ,  Joseph Huang ,  In Whan Kim

发明人： Wayne Yeung ,  Chiakang Sung ,  Myron W. Wong ,  Khai Nguyen ,  Bonnie I. Wang ,  Xiaobao Wang ,  Joseph Huang ,  In Whan Kim

IPC分类号： H01L2500

CPC分类号： G11C5/147 ,  G11C5/066

摘要： A programmable input/output circuit for a programmable logic device input/output pin can be configured in a standard I/O mode, or in a reference voltage mode. The circuit includes a tristatable, but otherwise standard I/O buffer as well as a reference voltage clamp circuit. In reference voltage mode, the I/O circuit is tristated, and the reference voltage clamp circuit passes a reference voltage from the I/O pin to a reference voltage bus. In standard I/O mode, the I/O buffer is operational. The reference voltage clamp circuit isolates the I/O pin from the reference voltage bus and may include undervoltage and overvoltage protection to prevent disturbance of the reference voltage bus by an out-of-range I/O signal.

摘要翻译： 可编程逻辑器件输入/输出引脚的可编程输入/输出电路可以在标准I / O模式或参考电压模式下进行配置。 该电路包括可跟踪的标准I / O缓冲器以及参考电压钳位电路。 在参考电压模式下，I / O电路被三态化，参考电压钳位电路将参考电压从I / O引脚传递到参考电压总线。 在标准I / O模式下，I / O缓冲区可以运行。 参考电压钳位电路将I / O引脚与参考电压总线隔离，并可能包括欠压和过压保护，以防止参考电压总线受到超出范围I / O信号的干扰。

公开(公告)号：US07358783B1

公开(公告)日：2008-04-15

申请号：US10400191

申请日：2003-03-25

申请人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

发明人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

IPC分类号： H03L7/095

CPC分类号： H03L7/0891 ,  H03F1/301 ,  H03H11/245 ,  H03K19/1774 ,  H03K23/665 ,  H03K2005/00045 ,  H03L7/081 ,  H03L7/089 ,  H03L7/0996 ,  H03L7/0997 ,  H03L7/18 ,  H03L7/183

摘要： A circuit provides a programmable phase shift feature, where the phase shift is programmably selectable by a user. This circuitry may be incorporated in a programmable logic device (PLD) or field programmable gate array (FPGA) to provide additional programmability features. The programmable phase shift circuitry may be implemented within a phase locked loop (PLL) or delay locked loop (DLL) circuit. In an implementation, the programmable phase shift circuitry is implemented using two programmable counters.

摘要翻译： 电路提供可编程相移特征，其中相移可由用户可编程地选择。 该电路可以并入可编程逻辑器件（PLD）或现场可编程门阵列（FPGA）中，以提供额外的可编程特性。 可编程相移电路可以在锁相环（PLL）或延迟锁定环（DLL）电路内实现。 在实现中，使用两个可编程计数器来实现可编程相移电路。

公开(公告)号：US06236231B1

公开(公告)日：2001-05-22

申请号：US09340222

申请日：1999-06-25

申请人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G. Cliff ,  Joseph Huang ,  Bonnie I. Wang ,  Wayne Yeung

发明人： Khai Nguyen ,  Xiaobao Wang ,  In Whan Kim ,  Chiakang Sung ,  Richard G. Cliff ,  Joseph Huang ,  Bonnie I. Wang ,  Wayne Yeung

IPC分类号： H03K19177

CPC分类号： H03K19/17744 ,  H03K19/018521 ,  H03K19/1778 ,  H03K19/17784

摘要： A programmable logic device is equipped for low voltage differential signaling (“LVDS”) by providing an LVDS input buffer and/or an LVDS output buffer on the device. I/O pins on the device that are used together in pairs for LVDS can alternatively be used individually for other types of signaling. The LVDS buffers are constructed to give good performance and to meet LVDS specifications despite variations due to temperature, manufacturing process inconsistency, and power supply changes.

摘要翻译： 可编程逻辑器件通过在器件上提供LVDS输入缓冲器和/或LVDS输出缓冲器来配备低电压差分信号（“LVDS”）。 对于LVDS成对使用的设备上的I / O引脚可以单独用于其他类型的信令。 尽管由于温度，制造过程不一致以及电源变化而导致变化，LVDS缓冲器也可以提供良好的性能和满足LVDS规范。

公开(公告)号：US07109765B1

公开(公告)日：2006-09-19

申请号：US10996186

申请日：2004-11-22

申请人： Bonnie I Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

发明人： Bonnie I Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

IPC分类号： H03L7/06

CPC分类号： H03L7/0891 ,  H03K19/1774 ,  H03L7/0812 ,  H03L7/0996

摘要： A circuit provides a programmable phase shift feature, where the phase shift is programmably selectable by a user. This circuitry may be incorporated in a programmable logic device (PLD) or field programmable gate array (FPGA) to provide additional programmability features. The programmable phase shift circuitry may be implemented within a phase locked loop (PLL) or delay locked loop (DLL) circuit.

公开(公告)号：US06667641B1

公开(公告)日：2003-12-23

申请号：US10056787

申请日：2002-01-23

申请人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

发明人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

IPC分类号： H03L708

CPC分类号： H03K19/1774 ,  H03K23/665 ,  H03K2005/00045 ,  H03L7/081 ,  H03L7/0891 ,  H03L7/0996 ,  H03L7/0997 ,  H03L7/183

摘要： A circuit provides a programmable phase shift feature, where the phase shift is programmably selectable by a user. This circuitry may be incorporated in a programmable logic device (PLD) or field programmable gate array (FPGA) to provide additional programmability features. The programmable phase shift circuitry may be implemented within a phase locked loop (PLL) or delay locked loop (DLL) circuit.

公开(公告)号：US06642758B1

公开(公告)日：2003-11-04

申请号：US09731473

申请日：2000-12-05

申请人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

发明人： Bonnie I. Wang ,  Joseph Huang ,  Chiakang Sung ,  Xiaobao Wang ,  In Whan Kim ,  Wayne Yeung ,  Khai Nguyen

IPC分类号： H03L7095

CPC分类号： H03L7/0891 ,  H03F1/301 ,  H03H11/245 ,  H03K19/1774 ,  H03K23/665 ,  H03K2005/00045 ,  H03L7/081 ,  H03L7/089 ,  H03L7/0996 ,  H03L7/0997 ,  H03L7/18 ,  H03L7/183

摘要： A circuit provides a programmable phase shift feature, where the phase shift is programmably selectable by a user. This circuitry may be incorporated in a programmable logic device (PLD) or field programmable gate array (FPGA) to provide additional programmability features. The programmable phase shift circuitry may be implemented within a phase locked loop (PLL) or delay locked loop (DLL) circuit. In an implementation, the programmable phase shift circuitry is implemented using two programmable counters.

摘要翻译： 电路提供可编程相移特征，其中相移可由用户可编程地选择。 该电路可以并入可编程逻辑器件（PLD）或现场可编程门阵列（FPGA）中，以提供额外的可编程特性。 可编程相移电路可以在锁相环（PLL）或延迟锁定环（DLL）电路内实现。 在实现中，使用两个可编程计数器来实现可编程相移电路。

公开(公告)号：US06617884B2

公开(公告)日：2003-09-09

申请号：US10160355

申请日：2002-05-28

申请人： Xiaobao Wang ,  Chiakang Sung ,  Joseph Huang ,  Bonnie I. Wang ,  Khai Nguyen ,  Wayne Yeung ,  In Whan Kim

发明人： Xiaobao Wang ,  Chiakang Sung ,  Joseph Huang ,  Bonnie I. Wang ,  Khai Nguyen ,  Wayne Yeung ,  In Whan Kim

IPC分类号： H03D1300

CPC分类号： H03K19/1774 ,  H03K2005/00045 ,  H03L7/081 ,  H03L7/0891 ,  H03L7/0996 ,  H03L7/0997 ,  H03L7/183

摘要： A phase frequency detector (PFD) circuit (516) compares two clock signals and generates a number of outputs to indicate a phase difference between these two clock signals (513, 519). The phase frequency detector has more than three states. The PFD circuit may be used in phase locked loop (PLL) or delay locked loop (DLL) circuit in order to maintain or lock a phase relationship between the two clock signals. The PFD circuitry will allow for a fast lock acquisition time, even when there is a relatively wide frequency range between the two clock signals.

公开(公告)号：US06448820B1

公开(公告)日：2002-09-10

申请号：US09432442

申请日：1999-11-02

申请人： Xiaobao Wang ,  Chiakang Sung ,  Joseph Huang ,  Bonnie I. Wang ,  Khai Nguyen ,  Wayne Yeung ,  In Whan Kim

发明人： Xiaobao Wang ,  Chiakang Sung ,  Joseph Huang ,  Bonnie I. Wang ,  Khai Nguyen ,  Wayne Yeung ,  In Whan Kim

IPC分类号： H03D1300

CPC分类号： H03K19/1774 ,  H03K2005/00045 ,  H03L7/081 ,  H03L7/0891 ,  H03L7/0996 ,  H03L7/0997 ,  H03L7/183

摘要： A phase frequency detector (PFD) circuit (516) compares two clock signals and generates a number of outputs to indicate a phase difference between these two clock signals (513, 519). The phase frequency detector has more than three states. The PFD circuit may be used in phase locked loop (PLL) or delay locked loop (DLL) circuit in order to maintain or lock a phase relationship between the two clock signals. The PFD circuitry will allow for a fast lock acquisition time, even when there is a relatively wide frequency range between the two clock signals.