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关于TMS320F2802x系列主频问题

Other Parts Discussed in Thread: TMS320F28027, TMS320F28023

TMS320F2802x系列DSP主频有40MHz、50MHz和60MHz的产品,请问这几款产品生产工艺是一样的吗?如果一样为什么主频不一样呢,是不是40M的产品是生产出来的残次品,不能跑60MHz,降额出的芯片呢?如果是,芯片的运行可靠性怎么保证?