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dsp 2812芯片上topmark 的意义

请问一下DSP芯片表面TOPMARK 是什么意思啊?

同样是TMS320F2812PGFA 芯片 后面一行的英文字母有的是 CG-33A2NSW

有的却是 CG-1AA582W

还有的是CG-47C86XW

是什么意思啊???