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DP83825I: Manual 100Mbps setup fails on DP83825I.

Hyun-Je Lee

Prodigy 10 points

Part Number: DP83825I

I have confirmed that the below sequence works.

auto-negotiation (100mbps full) -> manual 100Mbps(full or half)
auto-negotiation (100mbps full) -> manual 10Mbps(full or half)
manual 100Mbps(full or half) -> auto-negotiation (100mbps full)
manual 10Mbps(full or half) -> auto-negotiation (100mbps full)
manual 100Mbps(full or half) -> manual 10Mbps(full or half)

But it always fails in the case below.

manual 10Mbps(full or half) -> manual 100Mbps(full or half)

The register values are as follows.

Write
- BMCR:0x2100

Read
- BMSR: 0x7849
- PHYSTS: 0x1104 or 0x5104

Regards,

Hyun-je

over 3 years ago

0 Hyun-Je Lee over 3 years ago

Prodigy 10 points

I set it up as follows and proceeded with the manual setting.

Write - PHYCR(0x19): 0xc000

It works in any combination.

Is there a way to do it without this setting (0x19)?

The cable I have is a direct cable.

The circuit diagram is shown below.

Regards,

Hyun-je

0 Hyun-Je Lee over 3 years ago

Prodigy 10 points

I'm not sure if the model name is correct.

The one I use has this value.

- PHYIDR1 = 0x2000

- PHYIDR2 = 0xa140

Looking at the latest kernel drivers, I noticed that I have a DP83825I and a DP83825S.

DP83825I? DP83825S? What's the difference?

code: linux/driver/net/phy/dp83822.c

#define DP83822_PHY_ID 0x2000a240

#define DP83825S_PHY_ID 0x2000a140 <---- DP83825I? DP83825S?

#define DP83825I_PHY_ID 0x2000a150

#define DP83825CM_PHY_ID 0x2000a160

#define DP83825CS_PHY_ID 0x2000a170

#define DP83826C_PHY_ID 0x2000a130

#define DP83826NC_PHY_ID 0x2000a110

0 Hyun-Je Lee over 3 years ago

Prodigy 10 points

I set Robust_Auto_MDIX to 1 in the CR1(0x09) register referring to another article on the forum.

-> e2e.ti.com/.../dp83822i-missing-link-after-switching-from-auto-negotiation-to-forced-mode

Everything is successful.

Can I use this?

Regards,

Hyun-je

+1 Vikram Sharma over 3 years ago in reply to Hyun-Je Lee

TI__Genius 16030 points

Yes you may use this .