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TPS51200 DDR3 配置 第7PIN(EN)管脚的接法咨询

目前正打算用贵司的TPS51200进行DDR3的VTT0.75V的配置,通过规格书的阅读发现,EN管脚,有的是直接接VCC3.3V,有的则是接的SLP_S3信号,请问有什么区别?如果接的是SLP_S3信号,这个信号是什么信号,来源于哪里,请帮忙解答,谢谢