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TMS320F28P659DK-Q1: 零等待寄存器,非零等待寄存器,字节0x80对齐

Part Number: TMS320F28P659DK-Q1

请问怎么理解文档中BGCRC模块中,提到的非零等待寄存器和零等待寄存器的划分啊,ROM都是非零等待,RAM丢失零等待吗?还是从时序上分的呀?还有为什么地址是0x80对齐的呀?我看论坛以前有人提到BGCRC不支持对Flash的访问,是因为Flash速度太慢,所以不使用BGCRC进行检查吗?