公开(公告)号：US20040225831A1

公开(公告)日：2004-11-11

申请号：US10435077

申请日：2003-05-09

Applicant: Tekelec

Inventor： Michael R. Pail ,  Robert Wallace ,  Jeremy T. Baus

IPC: G06F012/00

CPC classification number: G06F11/0793 ,  G06F11/073 ,  G06F11/0757

Abstract: Methods and systems for preserving dynamic random access memory content in response to a hung processor condition are disclosed. In order to preserve dynamic random access memory content, a first watchdog timer is initiated and strobed at a predetermined time interval less than its timeout value. If a hung processor condition occurs and the strobing of the first watchdog timer fails, the first watchdog timer generates a non-maskable interrupt to the processor. The non-maskable interrupt triggers the processor to execute an interrupt service routine. If the processor is able to execute the interrupt service routine, the interrupt service routine controls the processor to perform a selective system reset and preserve dynamic random access memory contents. If the processor is not capable of executing the interrupt service routine, a board reset occurs and dynamic random access memory contents are cleared.

Abstract translation: 公开了用于响应于挂起处理器条件来保留动态随机存取存储器内容的方法和系统。 为了保留动态随机存取存储器内容，第一看门狗定时器以小于其超时值的预定时间间隔发起并选通。 如果出现挂起的处理器状况，并且第一个看门狗定时器的选通程序失败，则第一个看门狗定时器向处理器产生不可屏蔽的中断。 不可屏蔽中断触发处理器执行中断服务程序。 如果处理器能够执行中断服务程序，则中断服务程序控制处理器执行选择性系统复位并保留动态随机存取存储器内容。 如果处理器不能执行中断服务程序，则会发生电路板复位，并清除动态随机存取存储器内容。