6657 PDK EMAC questions

Hi Thomas,

We will look into it in detail and get back.


Regards,
Shankari

Hi,

but according to keystone EMAC userguide, it should also support non-auto negotiation mode with master enabled mode, my questions is why the PDK MUST use this mode(disable master mode and auto negotiation mode) for C6657 in emac_open functions.I attached PDK code snapshot and userguide snapshot here for your quick reference.

You need to refer to the C6657 data manual for more information.

Keystone UG is common for all keystone I and II devices and we have to refer to the data manual of processor to know about peripheral further.

Hi 

Yes, I have checked C6657 data manual, but there is no info on this

Please help confirm, thank you!

Thomas

Hi,
Please refer to the following TI E2E post.

e2e.ti.com/.../1127418

Hi Thanks for info, but the link didn't answer my question as below 2 points
1)The case is for PHY-MAC connection, customer's case is for MAC-MAC connection
2) My question is for the confusion about PDK software intialization on emac_open() function, because customer usually call emac_open() in PDK for their intialization, if emac_open()function code doesn't fully support Keystone EMAC work mode as userguide mentions, then its test may fail when master mode needed, so we need to confirm whether C6657 support master mode with non-auto/auto negotiation mode or not, if yes, then customer can modify c6657 emac_open()function accordingly.
Thanks

Hi Thomas,
Apologize for the delayed response.
I'm checking with internal team and get back to you.
Thanks for your patience.

Thomas,

The reason for the PDK source code having the Master disabled and auto-neg ON is due to the Marvell PHY on the C6657 EVM (platform specific). That particular PHY acts as the master with the C6657 as the slave. MAC-MAC should also work if one is master and the other as slave. Hope this helps.

Lali

Lali
1. I checked C6657 datasheet(SPRS814B), datasheet suggested user refer to (SPRUGV9) for EMAC specific info. According to SPRUGV9 info, it supports MAC-MAC connection,
2. But according to C6657 doc webpage, www.ti.com/.../technicaldocuments, there are 2 doc for EMAC part, one is SPRUHH1<KeyStone Architecture Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)>, another is SPRUGK9A<TMS320C6457 DSP Ethernet Media Access Controller (EMAC)/ Management Data Input/Output (MDIO)>
,both of them contents are similar, and in section 2.3, it mentions "The device supports only the SGMII interface to the physical layer device"
Which doc is right? If 1 is right, C6657 should support MAC-MAC, if 2 is right, C6657 should only support MAC-PHY, PLEASE confirm this point, as it is important for customer hardware design.
Thomas