公开(公告)号：US09715467B2

公开(公告)日：2017-07-25

申请号：US14080724

申请日：2013-11-14

Applicant: RAMBUS INC.

Inventor： Pravin Kumar Venkatesan ,  Liji Gopalakrishnan ,  Kashinath Prabhu ,  Makarand Shirasgaonkar

IPC: G06F13/16

CPC classification number: G06F13/1668 ,  Y02D10/14

Abstract: A single-ended receiver is coupled to an input-output (I/O) pin of a command and address (CA) bus. The receiver is configurable with dual-mode I/O support to operate the CA bus in a low-swing mode and a high-swing mode. The receiver is configurable to receive a first command on the I/O pin while in the high-swing mode, initiate calibration of the slave device to operate in the low-swing mode in response to the first command, switch the slave device to operate in the low-swing mode while the CA bus remains active, and to receive a second command on the I/O pin while in the low-swing mode.

公开(公告)号：US09136826B2

公开(公告)日：2015-09-15

申请号：US13839059

申请日：2013-03-15

Applicant: Rambus Inc.

Inventor： Kambiz Kaviani ,  Kashinath Prabhu ,  Brian Hing-Kit Tsang ,  Jared L. Zerbe

IPC: G01R23/02 ,  H03K3/012 ,  H03K5/26 ,  G11C7/22 ,  H03L7/24

CPC classification number: H03K3/012 ,  G01R23/02 ,  G11C7/222 ,  H03K5/26 ,  H03L7/24

Abstract: Embodiments of an integrated circuit (IC) comprising frequency change detection circuitry are described. Some embodiments include first circuitry to generate a second clock signal based on a first clock signal, wherein the first clock signal has a first clock frequency, and wherein the second clock signal has a second clock frequency that is an integral multiple of the first clock frequency. The embodiments further include second circuitry to obtain samples by oversampling the first clock signal using the second clock signal. Additionally, the embodiments include third circuitry to detect a change in the first clock frequency based on the samples.

Abstract translation: 描述了包括频率变化检测电路的集成电路（IC）的实施例。 一些实施例包括基于第一时钟信号产生第二时钟信号的第一电路，其中第一时钟信号具有第一时钟频率，并且其中第二时钟信号具有作为第一时钟频率的整数倍的第二时钟频率 。 实施例还包括通过使用第二时钟信号过采样第一时钟信号来获得采样的第二电路。 另外，实施例包括基于样本检测第一时钟频率的变化的第三电路。