DP83822I: DP83822 - MAC series termination resistor

Sunset

Genius 13995 points

Part Number: DP83822I

Hello Team,

the DP83822 MAC has series termination resistors.

The Table 79 specifies all the values I can set.

The datasheet only mentions that those impedance are for the MAC digital pins.

Since it is a series resistor I would assume that it is only for the output drivers and not for the input lines.

Can you confirm which pin/lines do have the series Terminations?
Pins that are In/Out (depending on the configuration), I'm assuming that also have the terminations on the output, once set as Out.
Since the datasheet does not mention that you have to enable it, I take the assumption that by power up the impedance has the default value and then I can trim it as required by the application. can you confirm it?

Thanks,

SunSet

over 4 years ago

0 Gerome Cacho over 4 years ago

TI__Mastermind 39855 points

Hello,

All MAC output pins have series termination resistors. Yes, once the I/O is configured as an output, they will have the termination resistors. And you should be able to alter the value through register writes upon power up.

Sincerely,

Gerome

0 Sunset over 4 years ago in reply to Gerome Cacho

TI__Genius 13995 points

To be clean,

can you confirm that those pins have series resistors?

MII: TX_CLK, RX_CLK, RX_DV, RX_ER, RX_D[3:0], CRS
RGMII: RX_CLK, RX_CTRL, RX_D[3:0]

Thanks,

SunSet

0 Gerome Cacho over 4 years ago in reply to Sunset

TI__Mastermind 39855 points

Hello,

For MII mode, COL/GPIO2 should be included as that is a I/O.

Sincerely,

Gerome

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DP83822I: DP83822 - MAC series termination resistor