DP83TG720S-Q1: Line Driver Strength Adjustment

PY (Pengyu) Song

Part Number: DP83TG720S-Q1
Other Parts Discussed in Thread: DP83TC811

Hi team,

Is there any register can adjust gain of line driver like DP83TC811R/S-Q1 as below? Can the register be used to adjust drive strength to improve EMC.

+1 Kallikuppa Sreenivasa over 5 years ago

Thank you for the query.

Based on your query , i would request you to check A2D_REG_05 Register.

Regards,

Sreenivasa

0 PY (Pengyu) Song over 5 years ago in reply to Kallikuppa Sreenivasa

Hi Sreenivasa,

To confirm, can the register LDG_CTRL1 register in DP83TC811R/S-Q1 be used to adjust drive strength?
Below A2D_REG_05 in 720, can you please elaborate more? Is it the same register as LDG_CTRL1 in 811? Is it corresponding to driver gain? Can't really understand from the description.

+1 Kallikuppa Sreenivasa over 5 years ago in reply to PY (Pengyu) Song

Yes, LDG_CTRL1 can be used to adjust the drive strength for driver in DP83TC811.
In DP83TG720 datasheet regarding description of reg<x405>[15:0]. Text can be interpreted as following :

15:10 = 001010’b = 400mV pk swing;

001011’b = 440mV pk swing; and so on.

Regards,

Sreenivasa

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