i.MX Processors中的主题 i.MX6 USB drive strength.

i.MX6 USB drive strength.

satoshishimoda — Mon, 10 Nov 2014 11:01:07 GMT

Hi community,

I have a question about i.MX6DL USB PHY.

I want to change the drive strength of USB_OTG_DN and USB_OTG_DP when i.MX6SDL is device mode.

Then, can we change the drive strength by TXCAL45DN and TXCAL45DP fields in USBPHYx_TXn register (chapter 66.3.2 in IMX6SDLRM Rev.1)?

If we can do it, would you let me know the range we can set (xxx ohm to yyy ohm) and how much resistance is changed when setting is incremented (zzz ohm / bit)?

If we cannot do it by TXCAL45DN and TXCAL45DP, would you let me know how to change the drive strength?

Best Regards,

Satoshi Shimoda

Re: i.MX6 USB drive strength.

igorpadykov — Mon, 10 Nov 2014 12:02:13 GMT

Hi Satoshi

one can look at sect.4.3.3.2 Transmitter settings—USBPHY_TX register

AN4589 Configuring USB on i.MX 6 Series Processors

Values for TXCAL45 resistance change with ~1.66 Ohm per step.

Below values for D_CAL

Best regards

igor

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