TDA4VM: Does MCU_CPSW0 support spread spectrum?

user5892527

Part Number: TDA4VM

Because MCU_CPSW0 not support tune RGMII Rx Delay.

And can't get a satisfactory result by tune phy.

So we try to disable spread spectrum.

Does MCU_CPSW0 support spread spectrum? If yes, how to enable/disable spread spectrum?

0 ShreyasRao over 4 years ago

Hi,

when you tried to disable spread-spectrum, which register did you try, what did you do?

I see that there is MCU_PLL0_SS_CTRL register that has spread spectrum enabling/disabling control in its field.

0 user5892527 over 4 years ago in reply to ShreyasRao

We study how to disable spread-spectrum, not change yet.

Change MCU_PLL0_SS_CTRL, will affect other module?

How to disable spread-spectrum of RGMII only?

0 ShreyasRao over 4 years ago in reply to user5892527

We believe that the spread spectrum is not turned on and we do not recommend it.

Are you meeting the setup and hold time of the input (1ns).

can you give us scope captures of the setup/hold times?

Is this an issue only with the 1000 mode or if you could try the 10/100 mode and see no issues?

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