TM4C1294KCPDT: Ethernet break down at 10M

Daniel Fang

Part Number: TM4C1294KCPDT

SDK2.1.2.111

We use EMACPHYConfigSet() to set ethernet at 10M/100M speed.

It's working well on 100M by set parameter (EMAC_PHY_TYPE_INTERNAL | EMAC_PHY_INT_MDIX_EN | EMAC_PHY_AN_100B_T_FULL_DUPLEX).

It will break down or only running well occasionally when setting another side to 10M, even change parameter to EMAC_PHY_TYPE_INTERNAL | EMAC_PHY_INT_MDIX_EN | EMAC_PHY_AN_100B_T_FULL_DUPLEX)

What's the possible reason?

I find there is a bug in ethernet initialization from errata. Do you have reference code for it? Thanks.

over 8 years ago

0 Charles Tsai over 8 years ago

TI__Guru**** 191906 points

Hi,

I'm not sure if your problem is related to the errata. Please try the below code and see if it makes a difference.

To turn off the flash prefetch.

HWREG(FLASH_CONF) |= FLASH_CONF_FPFOFF;

To enable flash prefetch.

HWREG(FLASH_CONF) |= FLASH_CONF_FPFON;

0 cb1_mobile over 8 years ago in reply to Charles Tsai

Guru 117855 points

Once again - prior to ANY "bug report" is it not "professional" to repeat such "tests" across SEVERAL Boards - w/premium cable - and short/direct connection?

0 Daniel Fang over 8 years ago in reply to Charles Tsai

TI__Genius 11600 points

Hi Charles Tsai,

Thanks for your reply but don't solve the issue.

It could cause to dead when running at 10M. Could you provide below information?

1. 10M/100M adaptive reference configuration
2. Why cause to dead at 10M? Where should I check?
3. The best location for instruction prefetching and closing, it's perfect if provide complete ethernet initiation code.

0 Robert Adsett over 8 years ago in reply to Daniel Fang

Guru 27665 points

Daniel Fang said:
It could cause to dead when running at 10M.

I suspect working towards an answer will be easier if you explain what you mean by "could cause to dead".

How are you determining this?

What are the symptoms?

Robert

0 Charles Tsai over 8 years ago in reply to Daniel Fang

TI__Guru**** 191906 points

The speed interrogation is part of the auto-negotiation. My understanding is that for auto-negotiation to work not only the MCU needs to enable the auto-negotiation but also the other node of the network.

0 Daniel Fang over 8 years ago in reply to Charles Tsai

TI__Genius 11600 points

Hi Charles Tsai,

It's always pending at the descriptor DESC0_TX_CTRL_OWN change to zero.

Do you have 10M setting reference code? Thanks a lot.

0 Charles Tsai over 8 years ago in reply to Daniel Fang

TI__Guru**** 191906 points

Hi Daniel,
I don't know of any reference code examples for 10Mbit only operation. The TivaWare ethernet examples use the PHY auto-negotiation to adapt the speed.

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C1294KCPDT: Ethernet break down at 10M