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Fast Link Detect function of DP83867

Hello.

Please tell about Fast Link Detect function of DP83867.

Is the setting with Fast Link Detect as enable only strap of the CRS pin?
Or is there the register who can write in it ?
And does strap of the CRS pin have effect to Fast Link Drop?

By the way, please tell it about CFG1 of address 0x0009.(P.56 of data sheet)
DESCRIPTION or BIT NAME of bit9 of this register does not seem to be right.
Please tell right contents.
(1000BASE or 100BASE, Half or Full.)

Regards.