DP83620

Andrey Tsybezov

Other Parts Discussed in Thread: DP83620

Hi to all.

I develop ethernet driver for my switch board. I have some problem with PHY level based on DP83620.

Now I have a 50 MHz at TX_CLK and RX_CLK, but 25MHz at CLK_OUT instead of 50MHz RMII Reference clock in RMII Master Mode((((((

Device is configured by strap options for RMII Master Mode. Primary Clock Reference Input is 25 MHz.

Help me, plz!!!

over 11 years ago

Patrick OFarrell over 11 years ago

TI__Mastermind 31600 points

Andrey,

Do you have the ability to read the device registers? If so, could you read out registers 0x00 - 0x1F and post them? This would allow us to confirm configuration.

Patrick

Andrey Tsybezov over 11 years ago in reply to Patrick OFarrell

Prodigy 75 points

Patrick, my ethernet driver needs for FX mode, so this is my registers from 0x00 to 0x1F:

0x2100 0x78c9 0x2000 0x5ce1 0x0101 0x0000 0x0004 0x2001

0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000 0x0000

0x0004 0x0000 0x0000 0x0000 0x0000 0x0000 0x014b 0x4021

0x0000 0x0021 0x0904 0x0000 0x0000 0x6011 0x089e 0x0000

Patrick OFarrell over 11 years ago in reply to Andrey Tsybezov

TI__Mastermind 31600 points

Andrey,

Please try the following sequence of register accesses:

Write 0x006 to register 0x13.
Read register 0x14. Value read should be 0x800A.
Write 0x000A to register 0x14.
Write 0x0000 to register 0x13.

This should result in a 50MHz clock on the CLK_OUT pin.

Patrick

Andrey Tsybezov over 11 years ago in reply to Patrick OFarrell

Prodigy 75 points

Thank you very much, Patrick!!!

i have 50 Mhz on the CLK_OUT pin. But i don't find this method on datasheet DP83620. May be you have errata... For example, description of page 6 in register 0x13 is absent(((
If you have no errata, just give me description of extended registers (page 6 and etc), please!

Patrick OFarrell over 11 years ago in reply to Andrey Tsybezov

TI__Mastermind 31600 points

Andrey,

You are correct. This information is not in the datasheet, but should be included. I will update the datasheet to include this.

The only use for the DP83620 on page 6 is bit 15 of register 0x14. In the meantime, while I update the datasheet, please consider the other bits of this register and the registers on this page as RESERVED.

Patrick

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