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Original question:
DLPC3478的HOST_IRQ信号上电后一直为高无法初使化
Host_IRQ信号没有拉低，说明系统初始化有问题。常见的解决思路是，先检查DLPC芯片和DMD的供电是否正常，然后确认DLPC外挂的Flash已经烧录了对应的固件。在上电过程中可以测试一下DLPC有没有读flash，和DMD的LS信号是否正常。如果DLPA2005的ResetZ信号异常，可以检查一下2005外围电路是否正常。
