公开(公告)号：US20180040373A1

公开(公告)日：2018-02-08

申请号：US15787406

申请日：2017-10-18

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE ,  Futoshi IGAUE

IPC: G11C15/04

CPC classification number: G11C15/04 ,  G11C15/00 ,  G11C15/046

Abstract: The consumption current of a TCAM device is reduced. A semiconductor device includes multiple sub-arrays each including a TCAM cell array. Each sub-array searches the corresponding part of the input search data. Each sub-array outputs the search result indicative of a match for every entry without searching, when the corresponding first control signal is activated.

公开(公告)号：US20150228341A1

公开(公告)日：2015-08-13

申请号：US14691125

申请日：2015-04-20

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE ,  Isamu HAYASHI ,  Teruhiko AMANO ,  Fukashi MORISHITA ,  Kenji YOSHINAGA ,  Mihoko AKIYAMA ,  Shinya MIYAZAKI ,  Masakazu ISHIBASHI ,  Katsumi DOSAKA

IPC: G11C15/04

CPC classification number: G11C15/043 ,  G11C7/06 ,  G11C7/12 ,  G11C7/14 ,  G11C7/22 ,  G11C15/04 ,  G11C15/046

Abstract: An entry including multiple bits of unit cells each storing data bit is coupled to a match line. The match line is supplied with a charging current having a restricted current value smaller than a match line current flowing in a one-bit miss state in one entry, but larger than a match line current flowing in an all-bit match state in one entry. A precharge voltage level of a match line is restricted to a voltage level of half a power supply voltage or smaller. Power consumption in a search cycle of a content addressable memory can be reduced, and a search operation speed can be increased.

Abstract translation: 包括存储数据位的单位单元的多个比特的条目耦合到匹配线。 匹配线具有一个充电电流，该充电电流的限制电流值小于在一个条目中以一位未命中状态流动的匹配线电流，但大于在一个条目中以全位匹配状态流动的匹配线电流 。 匹配线的预充电电压电平被限制为电源电压的一半或更小的电压电平。 可以减少内容可寻址存储器的搜索周期中的功耗，并且可以提高搜索操作速度。

公开(公告)号：US20170062051A1

公开(公告)日：2017-03-02

申请号：US15227161

申请日：2016-08-03

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE ,  Futoshi IGAUE

IPC: G11C15/04

CPC classification number: G11C15/04 ,  G11C15/00 ,  G11C15/046

Abstract: The consumption current of a TCAM device is reduced. A semiconductor device includes multiple sub-arrays each including a TCAM cell array. Each sub-array searches the corresponding part of the input search data. Each sub-array outputs the search result indicative of a match for every entry without searching, when the corresponding first control signal is activated.

Abstract translation: 减少TCAM设备的消耗电流。 半导体器件包括多个子阵列，每个子阵列包括TCAM单元阵列。 每个子阵列搜索输入搜索数据的相应部分。 当对应的第一控制信号被激活时，每个子阵列输出指示每个条目匹配的搜索结果，而不进行搜索。

公开(公告)号：US20150055390A1

公开(公告)日：2015-02-26

申请号：US14529074

申请日：2014-10-30

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE

IPC: G11C15/04

CPC classification number: G11C15/04 ,  G11C15/00

Abstract: The present invention provides a content addressable memory capable of higher frequency operation than conventional. When a search enable signal supplied from a search control circuit is asserted, each of search line drivers transfers search data to each CAM cell of a CAM memory array via a search line pair. The search line enable signal is transmitted to the search line drivers via a single control signal line coupled to the search control circuit. The control signal line is coupled to the search line drivers in such a manner that the search line enable signal passes through coupling nodes between the search line drivers and the control signal line in an arrangement order of the search line drivers from the side far away as viewed from match amplifiers.

Abstract translation: 本发明提供一种能够比常规操作更高频率操作的内容可寻址存储器。 当从搜索控制电路提供的搜索使能信号被断言时，每个搜索线驱动器经由搜索线对将搜索数据传送到CAM存储器阵列的每个CAM单元。 搜索线使能信号通过耦合到搜索控制电路的单个控制信号线发送到搜索线驱动器。 控制信号线以这样的方式耦合到搜索线驱动器，使得搜索线使能信号以搜索线驱动器的排列顺序从搜索线驱动器和控制信号线之间的耦合节点从远离的一侧 从匹配放大器观看。

公开(公告)号：US20180350439A1

公开(公告)日：2018-12-06

申请号：US16056321

申请日：2018-08-06

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE ,  Futoshi IGAUE

IPC: G11C15/04

CPC classification number: G11C15/04 ,  G11C15/00 ,  G11C15/046

Abstract: The consumption current of a TCAM device is reduced. A semiconductor device includes multiple sub-arrays each including a TCAM cell array. Each sub-array searches the corresponding part of the input search data. Each sub-array outputs the search result indicative of a match for every entry without searching, when the corresponding first control signal is activated.

公开(公告)号：US20170060438A1

公开(公告)日：2017-03-02

申请号：US15228631

申请日：2016-08-04

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Futoshi IGAUE ,  Kenji YOSHINAGA ,  Naoya WATANABE ,  Mihoko AKIYAMA

IPC: G06F3/06 ,  G11C15/04

CPC classification number: G11C15/04

Abstract: The present invention makes it possible to form a circuit configuration that is capable of executing a keyword search at an increased speed while suppressing an increase in the memory capacity of a content-addressable memory. A semiconductor device according to an aspect of the present invention searches an input data string for a predesignated keyword, and includes a first content-addressable memory that stores a partial keyword corresponding to a predetermined number of data beginning with the first data of the keyword, a second content-addressable memory that stores the entirety of the keyword, and a control circuit that is coupled to the first content-addressable memory and to the second content-addressable memory. When a portion matching the partial keyword is detected in the input data string by a search in the first content-addressable memory, the second content-addressable memory executes a search on search data extracted from the input data string.

Abstract translation: 本发明使得可以形成能够以抑制增加内容寻址存储器的存储容量的方式以增加的速度执行关键字搜索的电路配置。 根据本发明的一个方面的半导体器件搜索用于预先指定的关键词的输入数据串，并且包括第一内容寻址存储器，其存储与从关键字的第一数据开始的预定数量的数据相对应的部分关键字， 存储关键字整体的第二可内容寻址存储器，以及耦合到第一可内容寻址存储器和第二内容寻址存储器的控制电路。 当通过在第一可内容寻址存储器中的搜索在输入数据串中检测到匹配部分关键字的部分时，第二内容可寻址存储器对从输入数据串提取的搜索数据执行搜索。

公开(公告)号：US20140126264A1

公开(公告)日：2014-05-08

申请号：US14151606

申请日：2014-01-09

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Naoya WATANABE ,  Isamu Hayashi ,  Teruhiko Amano ,  Fukashi Morishita ,  Kenji Yoshinaga ,  Mihoko Akiyama ,  Shinya Miyazaki ,  Masakazu Ishibashi ,  Katsumi Dosaka

IPC: G11C15/04

CPC classification number: G11C15/043 ,  G11C7/06 ,  G11C7/12 ,  G11C7/14 ,  G11C7/22 ,  G11C15/04 ,  G11C15/046

Abstract: An entry including multiple bits of unit cells each storing data bit is coupled to a match line. The match line is supplied with a charging current having a restricted current value smaller than a match line current flowing in a one-bit miss state in one entry, but larger than a match line current flowing in an all-bit match state in one entry. A precharge voltage level of a match line is restricted to a voltage level of half a power supply voltage or smaller. Power consumption in a search cycle of a content addressable memory can be reduced, and a search operation speed can be increased.

Abstract translation: 包括存储数据位的单位单元的多个比特的条目耦合到匹配线。 匹配线具有一个充电电流，该充电电流的限制电流值小于在一个条目中以一位未命中状态流动的匹配线电流，但大于在一个条目中以全位匹配状态流动的匹配线电流 。 匹配线的预充电电压电平被限制为电源电压的一半或更小的电压电平。 可以减少内容可寻址存储器的搜索周期中的功耗，并且可以提高搜索操作速度。