Configuration pins vs. registers of PHY 88E1111

The configuration pins determine the power-on setup of the PHY. For example, look on p41 of this schematic:

http://www.ovro.caltech.edu/~dwh/carma_board/gda06rb004_carma_v0.87_dec03.pdf

The bottom left has the mapping between the CONFIG bits, the pin connections on the PHY, the 3-bit code that each connection represents, and then those bits decoded into power-on-reset functions.

Cheers,

Dave

hum...

So how to change the configuration?

The schematic shows that they are configured physically with wires.

I mean is it possible to change this default configuration and how?

Thanks in advance

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So how to change the configuration?

The schematic shows that they are configured physically with wires.

I mean is it possible to change this default configuration and how?

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You cannot change the "default" without re-wiring the board - that's the point of a default :)

Cheers,

Dave

I'm a bit confused my dear friend.

Look! This image describes the default settings for device:

http://www.tinyuploads.com/images/Wj7RWj.png

Do you mean that if I want to change for example the Phy address, it is impossible?

because rewiring the board is impossible.

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Do you mean that if I want to change for example the Phy address, it is impossible? because rewiring the board is impossible.

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Yes. The PHY address is like the I2C slave address. When you design the board, the designer decides what address to assign it. If the MDIO I2C bus is used for controlling multiple PHYs, then each needs to have a unique address.

This is not the same as the MAC address of a network interface.

What is it that you would like to change?

Cheers,

Dave

yes...

For example imagine I wanna disable Auto-Negotiation or enable energy detect.

Thanks

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For example imagine I wanna disable Auto-Negotiation or enable energy detect.

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The default values of the PHY registers are loaded from the configuration pin settings. Some settings can be changed by software. You need to get a copy of the data sheet.

Cheers,

Dave

Some adds:

- The data sheet is under NDA, but you can get a copy, if you explain, why you need it, generally.

- The PHY has more than 32 registers , see paging function in the sheet

- The hard wired config information can be overwritten by MDIO interface and register access.