For an embedded core, which is deeply embedded in the system chip, direct physical access to its peripheries is not available by default;hence, additional access mechanisms are required.
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由于嵌入核与芯片的输入/输出管脚没有直接通路,因此需要设计专门的测试通路结构对它们进行测试,以减少测试时间,降低测试成本。
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