DP83822IF: Carrier Sense with MII mode

Hirotaka Matsumoto

Part Number: DP83822IF

Hi all

Would you mind if we ask DP83822IF?
There is the description "Carrier Sense: In MII mode this pin is asserted high when the receive and/or transmit medium is non-idle.".

Does it need CRS is asserted high when the transmit medium is non-idle?
CRS doesn't require to use in case of trasmission.
Could you give us why it is necessary that CRS is asserted high when the transmit medium is non-idle?

Kind regards,

Hirotaka Matsumoto

over 8 years ago

0 Rob Rodrigues over 8 years ago

TI__Mastermind 19780 points

Hi Matsumoto-san,

The CRS signal is an output of the PHY. It does not need the system to raise CRS signal.

CRS is used for half-duplex communications. It lets the MAC know that the far end is transmitting, or two nodes on a shared medium are transmitting.

Do you plan to use half-duplex mode? It is not common today.

Best Regards,

0 Hirotaka Matsumoto over 8 years ago in reply to Rob Rodrigues

Guru 27585 points

Rob san

Thank you for your reply!

OK, we got it.

Kind regards,

Hirotaka Matsumoto

Interface

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DP83822IF: Carrier Sense with MII mode