CCS/RM48L952: rm48l952

user5269270

Intellectual 705 points

Part Number: RM48L952
Other Parts Discussed in Thread: DP83848-EP

Tool/software: Code Composer Studio

Dear sir/madam,

we are using DP83848-EP in our project. But we are trying to configuration RMII mode but not happening.

we made RX_DV /MII_MODE to pullup & but the PHY pin end it was LOW. Voltage at PBFIN1,PBFIN2 & PBFOUT is 1.8V .

we are using LWIP Stack for TCP/IP. Link_LED & Speed_LED is ON after power on, for 1 second ACT_LED is blink then it is getting OFF.

RBIAS -we connected 4.75KE resistor to GND.

i have enclosed DP83848-EP register status & i have attached schematic 3414.screenshot.docx. Please suggest me how to proceed further.

3632.Ethernet_PHY_DEVICE_REGISTER_STATUS_APM.docx

over 6 years ago

0 Wade Vonbergen over 6 years ago

TI__Guru 62930 points

RX_DV/MII_MODE is connected to a signal. Is this signal high at reset. Staps are only sampled at reset.
Is proper reset timing observed?

Have you referenced this app note:
www.ti.com/.../snla076

Regards,
Wade

0 user5269270 over 6 years ago in reply to Wade Vonbergen

Intellectual 705 points

hi wade ,

Thanks for your reply

when we press reset RX_DV/MII_MODE is becoming high then after releasing reset it is becoming low.

Reset Timing observed as 250ms .

0 Wade Vonbergen over 6 years ago in reply to user5269270

TI__Guru 62930 points

Do you have a pullup on RX_DV/MII_MODE?
The schematic does not show this. If possible, can you provide scope shot of reset and this pin when reset asserted/deasserted?

The value of this pin is sampled at reset, and changes the operation of the device. You will want it pulled up when reset is deasserted.

Regards,
Wade

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CCS/RM48L952: rm48l952