Access Port Protection for Reconfigurable Scan Networks

Access Port Protection for Reconfigurable Scan Networks
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可重新配置扫描网络的访问端口保护

DOI:
10.1007/s10836-014-5484-2
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发表时间:
2014
期刊:
Journal of Electronic Testing
影响因子:
--
通讯作者:
H.-J. Wunderlich
H.-J. Wunderlich
中科院分区:
--
文献类型:
--
作者:
R. Baranowski;M.A. Kochte;H.-J. Wunderlich

文献摘要

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基于IEEE Std. 1149.1 (JTAG)、1500 (SECT)和P1687 (IJTAG)的扫描基础结构为测试、重新配置和调试目的提供了一种经济有效的访问机制。然而,片上仪器的可访问性的提高对系统的安全和保障构成了严重的威胁。虽然符合JTAG和SECT的扫描架构的最先进的保护方法非常有效,但这些技术中的大多数在即将到来的IJTAG标准允许的可重构扫描网络中面临可扩展性问题。本文提出了一种可扩展的可重构扫描网络多级访问管理解决方案。对受保护仪器的访问在网络接口处受到本地限制。访问限制是通过序列过滤器实现的,该过滤器只允许预先计算的一组扫描访问序列。这种方法不需要对扫描体系结构进行任何修改,也不会造成访问时间损失。因此,它非常适合具有硬宏和3D集成电路的基于核心的设计。对于复杂的可重构扫描网络的实验结果表明,区域开销主要取决于允许访问的数量,并且即使这个数量超过网络中的寄存器计数也是边际的。
Scan infrastructures based on IEEE Std. 1149.1 (JTAG), 1500 (SECT), and P1687 (IJTAG) provide a cost-effective access mechanism for test, reconfiguration, and debugging purposes. The improved accessibility of on-chip instruments, however, poses a serious threat to system safety and security. While state-of-the-art protection methods for scan architectures compliant with JTAG and SECT are very effective, most of these techniques face scalability issues in reconfigurable scan networks allowed by the upcoming IJTAG standard. This paper describes a scalable solution for multi-level access management in reconfigurable scan networks. The access to protected instruments is restricted locally at the interface to the network. The access restriction is realized by asequence filterthat allows only a precomputed set of scan-in access sequences. This approach does not require any modification of the scan architecture and causes no access time penalty. Therefore, it is well suited for core-based designs with hard macros and 3D integrated circuits. Experimental results for complex reconfigurable scan networks show that the area overhead depends primarily on the number of allowed accesses, and is marginal even if this number exceeds the count of registers in the network.
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