How to use i.MX6SDL ENET_CRS_DV pad for CRS for RMII mode.

[satoshishimoda]

Hi all,

I consider using i.MX6DL RMII.

Please see Table 23-1 in IMX6SDLRM (Rev.1).

It shows ENET_CRS_DV pad can use for generating the CRS signal in RMII mode.

However, in chapter 37.4.117, there is no description about "CRS".

So I understand I can use ENET_CRS_DV pad to generate CRS in RMII mode with the following setting.

Is my understanding correct?

1. Set MUX_MODE field in chapter 37.4.117 to 001b (ALT1 ENET_RX_EN).

2. Set DAISY bit in chapter 37.4.517 to 0 (ENET_CRS_DV_ALT1).

If some adittional setting is required, could you let me know it?

Best Regards,

Satoshi Shimoda

[qiang_li-mpu_se · Accepted solution]

Yes, you are right.

The RMII port was verified on iMX6 OTT reference design: https://community.freescale.com/docs/DOC-94561

The macro for that pin:

MX6DL_PAD_ENET_CRS_DV__ENET_RX_EN

#define MX6DL_PAD_ENET_CRS_DV__ENET_RX_EN                                      \

  IOMUX_PAD(0x05B4, 0x01E4, 1, 0x0828, 0, MX6DL_ENET_PAD_CTRL)

[satoshishimoda]

Dear Qiang Li,

Thank you for your reply.

OK, I got it!

Best Regards,

Satoshi Shimoda