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关于CC2530寄存器MDMCTRL0中的DEM_NUM_ZEROS设定

Other Parts Discussed in Thread: CC2530

在CC2530的用户手册的寄存器MDMCTRL0的相关位DEM_NUM_ZEROS的描述中,有“Sets how many zero symbols must be detected before the sync word when searching for sync. Note that only one is required to have a correlation value above the correlation threshold set in the MDMCTRL1 registe”,

但在MDMCTRL1的CORR_THR_SFD位域描述中则有

“Defines requirements for SFD detection:

0: The correlation value of one of the zero symbols of the preamble must be above the correlation threshold.
1: The correlation value of one zero symbol of the preamble and both symbols in the SFD must be above the correlation threshold.

问题:
DEM_NUM_ZEROS是否是设置preamble的多少个符号位被侦测到(在门槛CORR_THR 之上),如果是,在MDMCTRL1的CORR_THR_SFD的描述中,
则又说preamble的其中zero symbol之一。这样两处的描述不是有些冲突吗?
谢谢!