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flash的扇区擦除问题

目前flash API提供的是下面接口

oReturnCheck = Fapi_issueAsyncCommandWithAddress(Fapi_EraseSector,
(uint32 *)Bzero_Sector6_start);

想咨询一下,这些扇区擦除时,只有起始地址,没有擦除的长度。后面验证擦除接口

oReturnCheck = Fapi_doBlankCheck((uint32 *)Bzero_Sector6_start,
Sector64KB_u32length,
&oFlashStatusWord);

这个Sector64KB_u32length = 0x1000和0x4000.这两个长度,也不能全覆盖当前flash扇区的长度?

不知道这两个函数接口配合意义在哪?