DP83822I: pin connection question in RMII mode

Max Han

Intellectual 2260 points

Part Number: DP83822I

in RMII mode, does customer need to connect pin8(INT/PWDN_N), pin19(MDIO) and pin20(MDC) to MAC?

thanks.

over 5 years ago

0 Max Han over 5 years ago

TI__Intellectual 2260 points

DP83822IRHBR is the first time to be used in customer, could you give us a reference design to show how to connect DP83822IRHBR pins to MCU in RMII mode?

thanks

0 Max Han over 5 years ago in reply to Max Han

TI__Intellectual 2260 points

Hi,

1. based on datasheet, could customer connect pins of DP83822IRHBR as below figure?

2. what's the difference of RX_DV and CRS/CRS_DV?

3. customer want to connect CRS/CRS_DVy, and leave RX_CLK and RX_DV floating, is it ok?

0 Max Han over 5 years ago in reply to Max Han

TI__Intellectual 2260 points

from datasheet, in RMII mode, RX_CLK、RX_DV、RX_EN are not used, leave floating, right?

thanks.

0 Cecilia Reyes over 5 years ago in reply to Max Han

TI__Genius 9920 points

Hi Max,

You are correct, RX_CLK, RX_DV, and RX_ER are optional.

RX_DV and CRS are necessary signals used in MII whereas RX_DV is optional in RMII. You may review these signals in the IEEE spec.

Thanks,

Cecilia

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DP83822I: pin connection question in RMII mode