从不同的参考设计中,有两种接法,这两种接法不什么规则么,是什么原因导致的不同的接法呢?
Shine:
两者的区别是AM437x和DDR 参考电压是否单独供电。请看下面的schematic checklist.
Low power applications implementing DeepSleep or RTC+DDR modes require a split DDR voltage supply to AM437x and the DDR memory. This is so the power to AM437x can be turned off while still maintaining power to the DDR memory. In these cases, DDR_VREF circuits should be separated.
processors.wiki.ti.com/…/AM437x_Schematic_Checklist
yongqing wang:
其实这两种都可以,但是DDR单独供电稳定性更好点