公开(公告)号：US11165613B2

公开(公告)日：2021-11-02

申请号：US16256882

申请日：2019-01-24

Applicant: Rambus Inc.

Inventor： Jared L. Zerbe ,  Fred F. Chen ,  Andrew Ho ,  Ramin Farjad-Rad ,  John W. Poulton ,  Kevin S. Donnelly ,  Brian S. Leibowitz ,  Vladimir Stojanovic

IPC: H04L27/01 ,  H04L1/00 ,  H04L7/033 ,  H04L25/03 ,  H04L25/497 ,  H04W52/20 ,  H04L7/00 ,  H04L25/02 ,  H04W52/22

Abstract: A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.

公开(公告)号：US20150341128A1

公开(公告)日：2015-11-26

申请号：US14817607

申请日：2015-08-04

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: H04B17/29 ,  H04L27/01 ,  H04L25/03

CPC classification number: H04B17/29 ,  G01R31/31711 ,  G06F11/08 ,  H04B17/21 ,  H04L1/20 ,  H04L1/241 ,  H04L1/242 ,  H04L7/033 ,  H04L7/043 ,  H04L7/10 ,  H04L25/03006 ,  H04L25/03057 ,  H04L25/03146 ,  H04L25/03949 ,  H04L27/01

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

Abstract translation: 描述了数字接收机边缘测试的方法和电路。 这些方法和电路可以防止误差响应于错误接收的数据而崩溃，并且因此可以用在采用历史数据的接收机中以减少符号间干扰（ISI）。 一些实施例检测未知模式的输入数据流的接收错误，因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数，以保持足够的余量，尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例可以过滤错误数据以促进模式特定的边缘测试。

公开(公告)号：US08817932B2

公开(公告)日：2014-08-26

申请号：US13967530

申请日：2013-08-15

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: H04L7/00 ,  H04L27/06

CPC classification number: H04B17/29 ,  G01R31/31711 ,  G06F11/08 ,  H04B17/21 ,  H04L1/20 ,  H04L1/241 ,  H04L1/242 ,  H04L7/033 ,  H04L7/043 ,  H04L7/10 ,  H04L25/03006 ,  H04L25/03057 ,  H04L25/03146 ,  H04L25/03949 ,  H04L27/01

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

Abstract translation: 描述了数字接收机边缘测试的方法和电路。 这些方法和电路可以防止误差响应于错误接收的数据而崩溃，并且因此可以用在采用历史数据的接收机中以减少符号间干扰（ISI）。 一些实施例检测未知模式的输入数据流的接收错误，因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数，以保持足够的余量，尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例可以过滤错误数据以促进模式特定的边缘测试。

公开(公告)号：US20220182158A1

公开(公告)日：2022-06-09

申请号：US17557518

申请日：2021-12-21

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: H04B17/29 ,  H04L25/03 ,  H04L27/01 ,  H04B17/21 ,  G01R31/317 ,  H04L1/20 ,  H04L1/24 ,  H04L7/033 ,  G06F11/08

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

公开(公告)号：US10735116B2

公开(公告)日：2020-08-04

申请号：US16228470

申请日：2018-12-20

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: H04B17/29 ,  H04L1/20 ,  H04L1/24 ,  H04L25/03 ,  H04B17/21 ,  G01R31/317 ,  H04L27/01 ,  H04L7/033 ,  G06F11/08 ,  H04L7/04 ,  H04L7/10

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

公开(公告)号：US10205614B2

公开(公告)日：2019-02-12

申请号：US16010445

申请日：2018-06-16

Applicant: Rambus Inc.

Inventor： Jared L. Zerbe ,  Fred F. Chen ,  Andrew Ho ,  Ramin Farjad-Rad ,  John W. Poulton ,  Kevin S. Donnelly ,  Brian S. Leibowitz ,  Vladimir Stojanovic

IPC: H04L27/01 ,  H04L25/03 ,  H04L25/497 ,  H04W52/20 ,  H04L1/00 ,  H04L7/033 ,  H04L25/02 ,  H04L7/00 ,  H04W52/22

Abstract: A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.

公开(公告)号：US09544071B2

公开(公告)日：2017-01-10

申请号：US14817607

申请日：2015-08-04

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: H04B17/29 ,  H04L27/01 ,  H04L25/03 ,  G01R31/317 ,  H04L1/20 ,  H04L1/24 ,  H04L7/033 ,  G06F11/08 ,  H04B17/21 ,  H04L7/04 ,  H04L7/10

CPC classification number: H04B17/29 ,  G01R31/31711 ,  G06F11/08 ,  H04B17/21 ,  H04L1/20 ,  H04L1/241 ,  H04L1/242 ,  H04L7/033 ,  H04L7/043 ,  H04L7/10 ,  H04L25/03006 ,  H04L25/03057 ,  H04L25/03146 ,  H04L25/03949 ,  H04L27/01

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

Abstract translation: 描述了数字接收机边缘测试的方法和电路。 这些方法和电路可以防止误差响应于错误接收的数据而崩溃，并且因此可以用于采用历史数据的接收机来减少符号间干扰（ISI）。 一些实施例检测未知模式的输入数据流的接收错误，因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数，以保持足够的余量，尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例可以过滤错误数据以促进模式特定的边缘测试。

公开(公告)号：US20150222303A1

公开(公告)日：2015-08-06

申请号：US14620163

申请日：2015-02-11

Applicant: Rambus Inc.

Inventor： Vladimir Stojanovic ,  Andrew C. Ho ,  Anthony Bessios ,  Fred F. Chen ,  Elad Alon ,  Mark A. Horowitz

IPC: H04B1/04

CPC classification number: H04L25/49 ,  H04B1/04 ,  H04B1/0475 ,  H04B2001/0416 ,  H04L25/025 ,  H04L25/028 ,  H04L25/0282 ,  H04L25/03019 ,  H04L25/03343 ,  H04L25/03885 ,  H04L25/061 ,  H04L25/4917 ,  H04L2025/03363 ,  H04L2025/03802

Abstract: A high-speed signaling system with adaptive transmit pre-emphasis. A transmit circuit has a plurality of output drivers to output a first signal onto a signal path. A receive circuit is coupled to receive the first signal via the signal path and configured to generate an indication of whether the first signal exceeds a threshold level. A first threshold control circuit is coupled to receive the indication from the receive circuit and configured to adjust the threshold level according to whether the first signal exceeds the threshold level. A drive strength control circuit is coupled to receive the indication from the receive circuit and configured to adjust a drive strength of at least one output driver of the plurality of output drivers according to whether the first signal exceeds the threshold level.

公开(公告)号：US20140331112A1

公开(公告)日：2014-11-06

申请号：US14333665

申请日：2014-07-17

Applicant: Rambus Inc.

Inventor： Andrew Ho ,  Vladimir Stojanovic ,  Bruno W. Garlepp ,  Fred F. Chen

IPC: G06F11/08

CPC classification number: H04B17/29 ,  G01R31/31711 ,  G06F11/08 ,  H04B17/21 ,  H04L1/20 ,  H04L1/241 ,  H04L1/242 ,  H04L7/033 ,  H04L7/043 ,  H04L7/10 ,  H04L25/03006 ,  H04L25/03057 ,  H04L25/03146 ,  H04L25/03949 ,  H04L27/01

Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.

Abstract translation: 描述了数字接收机边缘测试的方法和电路。 这些方法和电路可以防止误差响应于错误接收的数据而崩溃，并且因此可以用于采用历史数据的接收机来减少符号间干扰（ISI）。 一些实施例检测未知模式的输入数据流的接收错误，因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数，以保持足够的余量，尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例可以过滤错误数据以促进模式特定的边缘测试。