Hi Team,
I use DP83848K 10/100 base-T Phy from TI and I have a technical problem with one of my customers.
Problem description:
My unit (With DP83848K Phy) connected via LAN port to Cisco Router 1841. When unit configured to work on Force 100M FD the physical layer failed.
Phy registers Modes
================
When PHY works at AUTO mode this are the register dump
-> read_phy_regs
read_phy_regs
Reg = 0x0, Val = 0x1000
Reg = 0x1, Val = 0x786d
Reg = 0x2, Val = 0x2000
Reg = 0x3, Val = 0x5c90
Reg = 0x4, Val = 0x1e1
Reg = 0x5, Val = 0xc1e1
Reg = 0x6, Val = 0xd
Reg = 0x7, Val = 0x2801
Reg = 0x8, Val = 0x0
Reg = 0x9, Val = 0x0
Reg = 0xa, Val = 0x0
Reg = 0xb, Val = 0x0
Reg = 0xc, Val = 0x0
Reg = 0xd, Val = 0x0
Reg = 0xe, Val = 0x0
Reg = 0xf, Val = 0x0
Reg = 0x10, Val = 0x615
Reg = 0x11, Val = 0x0
Reg = 0x12, Val = 0x0
Reg = 0x13, Val = 0x0
Reg = 0x14, Val = 0x0
Reg = 0x15, Val = 0x0
Reg = 0x16, Val = 0x100
Reg = 0x17, Val = 0x1
Reg = 0x18, Val = 0x0
Reg = 0x19, Val = 0x8021
Reg = 0x1a, Val = 0x804
Reg = 0x1b, Val = 0x0
Reg = 0x1c, Val = 0x0
Reg = 0x1d, Val = 0x6011
Reg = 0x1e, Val = 0x83e
Reg = 0x1f, Val = 0x0
When changing Ethernet mode from AUTO NEG to Force 100M FD this is the action that my driver does
PHY Write register 0 value 0x800
PHY Write register 0 value 0x0
PHY Write register 0 value 0x8000
PHY Write register 0 value 0x1200
PHY Write register 4 value 0x101
PHY Write register 0 value 0x3300
PHY Write register 0 value 0x2100
PHY Write register 0 value 0x2100
This sequence of changing from AUTO NEG to Force 100M FD works on most of the Ethernet switches
I also tried writing manually from shell the value 0xA100 to register 0 (control register) but it didn’t help)
When I have the Synchronization problem ( Force 100M FD ) the Link status register (reg 1) shows the link is down all the time and also Cisco switch shows link down
Thanks,
Shlomi
