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SN65DSI86 會發生 PLL_UNLOCK and LOSS_OF_DP_SYNC_LOCK_ERR 畫面無輸出

Other Parts Discussed in Thread: SN65DSI86

最近新打回來的板子偶爾無畫面的現象

看0XF0~0XF8 狀態,其中的0xF5 and 0xF6 出現Error 通知

SN65DSI86 Reg[0xf0]=[0x0]
SN65DSI86 Reg[0xf1]=[0x0]
SN65DSI86 Reg[0xf2]=[0x0]
SN65DSI86 Reg[0xf3]=[0x0]
SN65DSI86 Reg[0xf4]=[0x0]
SN65DSI86 Reg[0xf5]=[0x20]
SN65DSI86 Reg[0xf6]=[0x40]
SN65DSI86 Reg[0xf7]=[0x0]
SN65DSI86 Reg[0xf8]=[0x1]

0xf5=0x20 ->  PLL_UNLOCK This bit is set whenever the PLL Lock status transitions from LOCK to UNLOCK.
0xf6=0x40-> LOSS_OF_DP_SYNC_LOCK_ERR. This field is set whenever the DP sync generator has lost lock with the DSI sync stream.
請問這問題要如何解,已卡很久了,請幫忙協助,謝謝