DP83TC812S-Q1: DP83TC812SRHARQ1: how to set the RX_CLK output automatically and continuously,in RGMII mode

Hyson chen

when DP83TC812 works on RGMII mode,how to set RX_CLK(pin27) output 25MHZ clk automatically and continuously,after POR finished.

SOC need to detect RX_CLK,if there is no output singal,SOC will report 'DMA engine initialization failed'error.

4 个月前

0 Lydia 4 个月前

TI__Mastermind 46135 points

您好，已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

0 Links 4 个月前

TI__Mastermind 40940 points

RX_CLK will automatically output 25MHz after POR if the device is properly strapped in RGMII mode.

Since DP83TC812 only supports 100Mbps MDI, RX_CLK will only operate at 25MHz.

0 Hyson chen 4 个月前回复 Links

Prodigy 20 points

My test phenomenon are not same as above.In my test，only when the MDI link-up(there is an another master device in the BUS,our DP83TC812 work as a slave),RX_CLK will output automatically(show in figure1).

If there is no link-up,RX_CLK will not output 25M clk signal(show in figure2).

And figure3 is my DP83TC812 strap setting.

0 Links 4 个月前回复 Hyson chen

TI__Mastermind 40940 points

I believe that this is a duplicate thread of: DP83TC812S-Q1: outputs 25M CLK to the SOC

I will close this duplicate thread and continue answering on the thread linked above.

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DP83TC812S-Q1: DP83TC812SRHARQ1: how to set the RX_CLK output automatically and continuously,in RGMII mode