An Observability Method for Check Bits in External Memory

Abstract

The invention discloses an observability method for external memory check bits. The observability method for the external memory check bits includes the steps that a first check bit corresponding to a to-be-observed object is obtained from an external memory; the to-be-observed object is located in an effective area of the external memory; the first check bit is saved in local; the observation procedure is called, the first check bit saved in local is read, and the first check bit serves as an observation check bit to be output; the observation check is located inside the external memory and outside of an effective observation area. By means of the observability method for the external memory check bits, covering of the check bits carried by the observation procedure to the first check bit corresponding to the to-be-observed object is avoided, real-time observation of the check bits is achieved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to an observability method of a parity bit of an external memory. Background technique [0002] The space computer is affected by radiation, which may lead to wrong logic state of the semiconductor circuit, which will cause the storage content in the storage body to change suddenly between "0" and "1", which will affect the function of the semiconductor device. Event Upset, SEU). In order to resist single event flipping, in the external memory accessed by the space computer processor, the stored data must be matched with the corresponding check bit, so as to meet the observation requirements of the check bit of the external memory during the application process of the space computer processor . [0003] At present, the observation of the parity bit is usually realized by using the debugging mode: the access to the external memory and the observation of the parity bit...

AI Technical Summary

Problems solved by technology

However, there are many problems in the existing debugging mode scheme: the debugging unit module can only realize the observability of the check digit when the space computer is in the non-working state, and cannot realize the check digit observability when the space computer is in the working state. Observability, there are certain limitations, and it is impossible to realize the observation of check digits in real time

Secondly, additional third-party equipment needs to be added, which costs more

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