OMAP-L138 MII termination info please

Steve Maltrud

Can you please inform me of the recommended MII_TXD[3:0] Termination? I understand that the MII_TXD[3:0] has built in termination consisting of configurable pullup/pulldown. Is there any other built in termination? I cannot see anything in the on-line documentation as such. We currently have a series resistor on the board but we're wondering if there is something already integrated. Ultimately, we need advice on the recommended termination for MII_TXD[3:0] – is the series resistor require? If so, what value of resistor is recommended?

over 12 years ago

0 David (ASIC) Liu over 12 years ago

TI__Guru**** 175781 points

Steve

Do you plan to use the ethernet interface? MII_TXD is muxed with GPIO and some other signals, Do you plan to keep the signals as MII_TXD or GPIO? If you configure the IO as GPIO, you can then configure the GPIO as input with internal pull up and pull down, or output that drives eithe high or low.

Thanks

David

0 Steve Maltrud over 12 years ago in reply to David (ASIC) Liu

Prodigy 250 points

David,

Thank you for the response. Actually we are planning to use the MII function of these pins to interface in a PHY-less configuration direct to the RvMII port of an Ethernet switch. Are pull up resistors then required?

Thanks,

Steve

0 David (ASIC) Liu over 12 years ago in reply to Steve Maltrud

TI__Guru**** 175781 points

Steve

Sorry for the late reply. You don't need external pull-up resistor. Is it possible to have a review of your schematic when you finish it?

Thanks
David

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OMAP-L138 MII termination info please