公开(公告)号：US20070258277A1

公开(公告)日：2007-11-08

申请号：US11774881

申请日：2007-07-09

Applicant: Stanley Ma ,  Peter Ma ,  Valerie Lines ,  Peter Gillingham ,  Robert McKenzie ,  Abdullah Ahmed

Inventor： Stanley Ma ,  Peter Ma ,  Valerie Lines ,  Peter Gillingham ,  Robert McKenzie ,  Abdullah Ahmed

IPC: G11C15/00

CPC classification number: G11C7/06 ,  G11C15/04 ,  G11C15/043

Abstract: A matchline sense circuit for detecting a rising voltage on a matchline of a CAM array is disclosed. The circuit initially precharges a matchline to ground before turning on a current source to supply current to the matchline and raise the voltage of the matchline. A reference matchline sense circuit generates a self-timed control signal to keep the current supply turned on for a predetermined duration of time. Sensed data on the matchlines are latched after the current source is turned off and the matchlines are precharged to ground. Because the matchline sense circuit of the present invention precharges the matchlines to ground instead of the supply voltage, VDD, less power is consumed. By sensing the rise of the matchline voltage to an n-channel transistor threshold potential, the matchline sensing operation speed is increased.

Abstract translation: 公开了一种用于检测CAM阵列的匹配线上的上升电压的匹配线检测电路。 在开启电流源以将电流提供给匹配线之前，该电路首先将匹配线预先接地，并提高匹配线的电压。 参考匹配线检测电路产生自定时控制信号以保持电流供应在预定持续时间内接通。 电流源关闭后，匹配线上的感测数据将被锁存，并将匹配线预充电到地。 因为本发明的匹配线检测电路将匹配线预充电到地电而不是电源电压VDD，所以消耗较少的功率。 通过感测匹配线电压升高到n沟道晶体管阈值电位，匹配线感测操作速度增加。

公开(公告)号：US20060083042A1

公开(公告)日：2006-04-20

申请号：US11285197

申请日：2005-11-23

Applicant: Stanley Ma ,  Peter Ma

Inventor： Stanley Ma ,  Peter Ma

IPC: G11C15/00

CPC classification number: G11C15/043 ,  G11C11/56 ,  G11C11/5642 ,  G11C15/00 ,  G11C15/04 ,  G11C15/046

Abstract: A multiple matchline sense circuit for detecting a single, more than one, or no match conditions during a search-and-compare operation of a content addressable memory is disclosed. The circuit compares the rising voltage rate of a multiple matchline to the rising voltage rate of a reference multiple matchline in order to generate a multibit result representing one of the three conditions. The circuit generates a self-timed control signal to end the search-and-compare operation, and to set the circuit to a precharge state.

Abstract translation: 公开了一种用于在内容可寻址存储器的搜索和比较操作期间检测单个，多于一个或不匹配条件的多匹配线路感测电路。 该电路将多匹配线的上升电压速率与参考多匹配线的上升电压比进行比较，以便产生表示三种条件之一的多位结果。 电路产生自定时控制信号以结束搜索比较操作，并将电路设置为预充电状态。

公开(公告)号：US20060083041A1

公开(公告)日：2006-04-20

申请号：US11269659

申请日：2005-11-09

Applicant: Stanley Ma ,  Peter Ma ,  Valerie Lines ,  Peter Gillingham ,  Robert McKenzie ,  Abdullah Ahmed

Inventor： Stanley Ma ,  Peter Ma ,  Valerie Lines ,  Peter Gillingham ,  Robert McKenzie ,  Abdullah Ahmed

IPC: G11C15/00

CPC classification number: G11C7/06 ,  G11C15/04 ,  G11C15/043

Abstract: A matchline sense circuit for detecting a rising voltage on a matchline of a CAM array is disclosed. The circuit initially precharges a matchline to ground before turning on a current source to supply current to the matchline and raise the voltage of the matchline. A reference matchline sense circuit generates a self-timed control signal to keep the current supply turned on for a predetermined duration of time. Sensed data on the matchlines are latched after the current source is turned off and the matchlines are precharged to ground. Because the matchline sense circuit of the present invention precharges the matchlines to ground instead of the supply voltage, VDD, less power is consumed. By sensing the rise of the matchline voltage to an n-channel transistor threshold potential, the matchline sensing operation speed is increased.

Abstract translation: 公开了一种用于检测CAM阵列的匹配线上的上升电压的匹配线检测电路。 在开启电流源以将电流提供给匹配线之前，该电路首先将匹配线预先接地，并提高匹配线的电压。 参考匹配线检测电路产生自定时控制信号以保持电流供应在预定持续时间内接通。 电流源关闭后，匹配线上的感测数据将被锁存，并将匹配线预充电到地。 因为本发明的匹配线检测电路将匹配线预充电到地电而不是电源电压VDD，所以消耗较少的功率。 通过感测匹配线电压升高到n沟道晶体管阈值电位，匹配线感测操作速度增加。