DP83822HF: Pin select Full MLT-3 on Tx+ and Tx-

Keith Nicholas

Part Number: DP83822HF

Hello,

Is there a way to pin strap the DP83822HF device so that it defaults to full MLT-3 mode (Class A), verses writing 0x0024 to the LDCSEL register?

If not, do you know of any other p2p PHY's that will default in this mode? The customer is using this without a transformer and would like this to be the default mode without writing to the registers.

Thanks,
Keith N.

over 7 years ago

0 Geet Modi over 7 years ago

TI__Mastermind 26320 points

Hi Keith,

The limitation to program register is coming from timing requirements or limitation on the host controlling MDIO ?

We don't have any p2p to DP83822 which can offer default full MLT-3. Incase p2p is not mandatory requirement, we may look at DP83848. See below App Note

http://www.ti.com/lit/an/snla088a/snla088a.pdf

Regards,
Geet

0 Keith Nicholas over 7 years ago in reply to Geet Modi

TI__Mastermind 47210 points

Hi Geet,

The limitation is on the host controlling MDIO; there is no easy way to implement in the current system. However, options are to add a transformer or change the PHY. In any case, this answers the question.

Thank you for the quick response.

Regards,
Keith

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DP83822HF: Pin select Full MLT-3 on Tx+ and Tx-