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：US20180046689A1

公开(公告)日：2018-02-15

申请号：US15630230

申请日：2017-06-22

Applicant: Renesas Electronics Corporation

Inventor： Kenji YOSHINAGA

IPC: G06F17/30

CPC classification number: G06F16/258 ,  G06F16/90344 ,  G06F16/951

Abstract: A technique is provided that reduces the number of used entries in a CAM required to store a rule.A data conversion device generates entry data which is to be compared with a search key and is stored in an associative memory that can hold three or more values. The data conversion device includes a conversion circuit for extracting a plurality of character strings from an inputted rule in accordance with a regular expression based on the regular expression and converting first and second character strings included in the character strings, respectively, into first and second bit data different from each other, and an encode circuit that compares the first bit data and the second bit data for each bit and generates entry data where each mismatch bit among a plurality of bits included in the first bit data is converted into “Don't Care” value based on a comparison result.

公开(公告)号：US20130249624A1

公开(公告)日：2013-09-26

申请号：US13900210

申请日：2013-05-22

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Mihoko AKIYAMA ,  Futoshi IGAUE ,  Kenji YOSHINAGA ,  Masashi MATSUMURA ,  Fukashi MORISHITA

IPC: G05F1/46

CPC classification number: G05F1/468 ,  G11C5/025 ,  G11C5/147

Abstract: A semiconductor integrated circuit device has a negative voltage generation circuit provided at each power supply circuit unit for six memory macros. Therefore, the response with respect to variation in a negative voltage is increased. In a standby mode, a negative voltage supply line for the six memory macros is connected by a switch circuit, and only a negative voltage generation circuit of one power supply circuit unit among six negative voltage generation circuits of the six power supply circuit units is rendered active. Thus, increase in standby current can be prevented.

Abstract translation: 半导体集成电路器件具有设置在每个用于六个存储器宏的电源电路单元的负电压产生电路。 因此，相对于负电压的变化的响应增加。 在待机模式下，通过开关电路连接六个存储器宏的负电压供给线，并且仅在六个电源电路单元的六个负电压产生电路中仅一个电源电路单元的负电压产生电路 活性。 因此，可以防止待机电流的增加。

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。