AM2754-Q1: ethernet clock

Xingyu Zhu

Part Number: AM2754-Q1

Tool/software:

Hi expert,

Our customer is referring to AM275 EVM. Could you please help to elaborate the usage of sync_out_eth and RGMII_BCLK?

Best Regards,

Xingyu Zhu

0 Erik Friedel 5 months ago

Xingyu Zhu,

The SYNC1_OUT signal is used as a 10kHz PWM signal for the event capture input of the DP83TG721 Automotive Ethernet PHY.

Regards,

Erik

0 Xingyu Zhu 5 months ago in reply to Erik Friedel

Hi Erik,

Thanks for your reply. What is the purpose of RGMII_BCLK? It is used for AVB sync clk?

+1 Erik Friedel 5 months ago in reply to Xingyu Zhu

Xingyu Zhu,

The DP83TG721 Automotive Ethernet PHY features a media clock output. On the EVM, this media clock output is tied to AUDIO_EXT_REFCLK2.

This means that the Ethernet PHY media clock can be used by AM275x McASP to generate a bit clock and frame sync based on that clock reference.

Regards,

Erik

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