topic IMX8QXP Ethernet strap options in i.MX Processors

IMX8QXP Ethernet strap options

Chethanbg — Mon, 26 Jun 2023 12:47:03 GMT

Hi,

As per IMX8QXP eval board there is mode2[3:0] settings strap resistors options

In our custom board we are using IMX8QXP with KSZ8041RNL in RMII (10/100Mbps )

My query is

In eval board these strap resistors are belongs to AR8031 or IMX8QXP?

We are using IMX8QXP with KSZ8041 so any mode settings to be done through hardware to select RMII?

In Datasheet or Reference manual of IMX8QXP there is no information on MODE setting strap resistors

Kindly clarify

Re: IMX8QXP Ethernet strap options

riteshmpatel — Tue, 27 Jun 2023 05:59:26 GMT

Hi @Chethanbg,

I hope you are doing well.

In i.MX8QXP EVK, the strap resistors belong to the Ethernet PHY chip AR8031 and are configured as per the modes mentioned in the Ethernet PHY datasheet.

So, one can refer to the KSZ8041 datasheet and can configure the strap resistors accordingly in your custom board.

Thanks & Regards,
Ritesh M Patel

Re: IMX8QXP Ethernet strap options

Chethanbg — Tue, 27 Jun 2023 06:18:58 GMT

Dear @riteshmpatel

Thanks for the reply.Currently in RMII mode we are using 25 Mhz crystal mode

The KSZ8041RNL generates the 50MHz RMII REF_CLK and outputs it to the MAC

attached is the block diagram for your reference.

In pin configuration RGMII_TXC should be configured as ENET0_RCLK50M_IN input right?

IMX8QXP_ENET0_RGMII_TXC_CONN_ENET0_RCLK50M_IN 0x06000061

Also let us know the pad settings 0x06000061 is correct

Re: IMX8QXP Ethernet strap options

riteshmpatel — Tue, 27 Jun 2023 06:22:50 GMT

Hi @Chethanbg,

I request you to please raise a new ticket for the additional questions.

Thanks & Regards,
Ritesh M Patel