DP83822H: dp83822 connection failure with PC when cable shortened

Tool/software:

Hi TI

We are using dp83822 in our project, it is connected to pc ethernet port by a three meter long cable and it works fine. But when we shorten the calble to 30cm, the connection failed, please check the attached video, we can see that the local connection is always switching beteen linked and unlinked.

We read out some phy registers as below

test rphyall
----> argc:2
----> argv test
----> argv rphyall
PHY 0x0170: = 0x1102
PHY 0x0171: = 0x0108
PHY 0x0173: = 0x6a00
PHY 0x0177: = 0x0a41
PHY 0x0180: = 0x3100
PHY 0x0181: = 0x7849
PHY 0x0182: = 0x2000
PHY 0x0183: = 0xa240
PHY 0x0184: = 0x01e1
PHY 0x0185: = 0xcde1
PHY 0x0186: = 0x000f
PHY 0x0187: = 0x2001
PHY 0x0188: = 0xe008
PHY 0x0189: = 0x0020
PHY 0x018a: = 0x0100
robosense >
robosense >test rphyall
----> argc:2
----> argv test
----> argv rphyall
PHY 0x0170: = 0x1104
PHY 0x0171: = 0x0108
PHY 0x0173: = 0x2000
PHY 0x0177: = 0x0a41
PHY 0x0180: = 0x3100
PHY 0x0181: = 0x7849
PHY 0x0182: = 0x2000
PHY 0x0183: = 0xa240
PHY 0x0184: = 0x01e1
PHY 0x0185: = 0xcde1
PHY 0x0186: = 0x000f
PHY 0x0187: = 0x2001
PHY 0x0188: = 0x4806
PHY 0x0189: = 0x0020
PHY 0x018a: = 0x0100
robosense >

Please alse check our schematic. Looking forward to you reply. Thanks.