基于VCS的固存坏块仿真系统设计与应用

Design and Application of Simulation System for Solid-state Memory Invalid Blocks Based on VCS

摘要:

NAND Flash固态存储器(固存)广泛应用于航天工程,受限于微电子特性及制造工艺,固存在出厂及使用过程中均会产生坏块,通常由固存控制FPGA(现场可编程门阵列)来管理并标记坏块_]。为保证固存控制FPGA对坏块管理的正确性、健壮性,必须对其进行严格验证。提出了基于VCS的固存坏块仿真验证系统,为固存控制FPGA提供了所需的外围接口,特别是提供了固存坏块反馈机制,令固存坏块产生时机受控；实时向FPGA反馈固存读写过程及产生的坏块信息；将坏块表建立、维护和固存响应过程记录到数据文件；实现了坏块分布的可配置性和仿真系统的闭环性、可记录性。仿真系统可有效发现坏块管理的设计缺陷,进而优化设计,提高航天固存产品可靠性。

Abstract:

Solid-state Memory based on NAND Flash has been widely applied in aerospace engineering.Limited by its microelectronic characteristic and manufacturing technics, Solid-state Memory may generate invalid blocks duiring the manufacturing or working process.Usually, FPGA is used to manage and tag invalid blocks of Solid-state Memory .To guarantee the correctness and robustness of invalid blocks management provided by FPGA,strict verification must be performed. Simulation System for Solid-state Memory Invalid Blocks Based on VCS was proposed.It provides necessary peripheral IOs for FPGA,especially the feedback mechanism of invalid blocks which making the generation of invalid blocks under control; reading-writing process and the information of invalid blocks are fed back to FPGA in real time; the establishment and maintenance procedure of invalid blocks as well as the response of Solid-state Memory