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DLPC3478芯片上电后HOST_IRQ上电一直为高是怎么回事?

Other Parts Discussed in Thread: DLPC3478

Hi

我i这边设计了一块DLPC3478的电路板,参考demo线路设计,其中HOST_IRQ信号上电后一直为高,没有拉低,按照3478手册上的时序要求,只有当HOST_IRQ信号变低之后,I2C通信才被允许,请问这个HOST_IRQ信号一直为高的原因是什么呢?

另外,CY7C65215这颗USB转I2C的芯片裸板是否需要烧录固件,烧录方式是怎样的,麻烦提供下,谢谢