DP83822HF: RX_D3 / GPIO3 Pin for Strap Mode 1 and Speed LED

Shinichi Yokota

Part Number: DP83822HF

Hello,

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How can DP83822HF's RX_D3 / GPIO3 pin (pin 1) be configured as strap Mode 1 and Speed LED? I guess an external LED must be connected to GND. Please confirm.

Best regards,
Shinichi Yokota

over 4 years ago

0 Lucas Wolter over 4 years ago

TI__Mastermind 28240 points

Hi Shinichi,

RX_D3 should remain in strap mode 1 with the LED and resistor connected to ground. Since RX_D3 is internally pulled down, adding an external pull-down shouldn't change the strap setting.

I wanted to confirm, are you using register 0x462 to set RX_D3 as an LED pin?

Thanks,

Lucas

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

0 Shinichi Yokota over 4 years ago in reply to Lucas Wolter

TI__Genius 9715 points

Lucas,

Thanks for your feedback. The LED_3 is successfully turned on after the register setting. However, the LED_3 keeps on even after a fiber cable is removed. What's wrong and how can I fix it?

When a system is turned on without a fiber cable connection, the LED_0 is off.
- This is expected.
After the register 0x0462 bit[10:8] is set to 001b and a fiber cable is plugged in, the LED_3 becomes on.
- This is expected.
After the fiber cable is removed, the LED_3 still keeps on.
- This is NOT expected.

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