datasheet上有下面这句话,意思是芯片内部有双核吗? 可以并行计算吗?

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不是,这个是用于功能安全的锁步核。简单来说,锁步核会执行(或者说模拟执行)同CPU一样的代码,然后比较两者的差异,如果相同,基本就可以判定CPU的工作是正常的;如果不同,说明至少其中之一可能出现了问题,就会采取进一步的操作。
具体可以看下spruiy4a_TMS320F280015x Real-Time Microcontrollers Technical Reference Manual (Rev. A) Chapter 3 Lockstep Compare Module (LCM)