关于CC2530寄存器MDMCTRL0中的DEM_NUM_ZEROS设定

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！

DEM_NUM_ZEROS是指当搜索同步时，设置在同步字之前必须要检测到的zero symbol的个数