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AM3352 使能MMU CACHE后运行速度还是很慢

Other Parts Discussed in Thread: AM3352, SYSBIOS

请教一下,为何我使用CC6+XDS200 开发调试AM3352,程序正可以正常进入调试,但是运行速度特别慢呢?利用示波器捕抓IO的波形,一个变量初始值720000减减为0居然要570ms这是什么情况呢?使能MMU和CACHE之后,是300ms  是我哪里配置出错吗?这个运行速度太慢了