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66AK2G12 SYSOSC

Other Parts Discussed in Thread: 66AK2G12

在66AK2G12 datasheet的Page70有这样一段描述:

(5) When connecting SYSOSC_IN to an LVCMOS clock source, the LVCMOS clock source output must be disabled anytime SYSOSC is

disabled since SYSOSC_IN has a strong internal pull-down resistor which is turned on when SYSOSC is disabled.

       根据我的理解,这段话的意思是当SYSOSC is disabled时,必须关闭有源晶振的输出。

 

       在TRM里面BOOTCFG_OSC_CTL Register关于SYSOSC的描述如下图所示,在复位状态下SYSOSC是enabled;

      

我想确认:使用系统的默认配置,系统时钟使用LVCMOS时钟,在上电过程中,以及系统处于复位状态时是不是都不用关闭LVCMOS时钟源?

 

下面是我设计的66AK2G12的系统时钟电路:SYSOSC_IN使用外部24MHz有源晶振,SYSOSC_OUT脚NC,SYSCLKSEL置低,R45不装配,OS1上电后默认输出,麻烦请check一下是否OK,谢谢!