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DP83849IF: Media converter : Strap/Register settings
Part Number: DP83849IF
I am using an optical transceiver that has an AC-coupled CML differential input and output.
I made the LVPECL termination for the DP83849IF as follows --> (TX+- pins: 50 Ohm to 3.3V, RX+- pins : 82 Ohm to 3.3V and 130 Ohm to GND, 0.1 µF coupling capacitors in series with all 4 lines).
With this termination the communication did not work.
I tried below setup as described in section 3.4.1(https://www.ti.com/lit/an/snla086b/snla086b.pdf) without firmware (no read & no write) to monitor the data on RXD lines for both PORTA and PORTB.
I have noticed that the PORTA - RXD0_A to RXD3_A lines are always 0. These lines show no pulses when I connect the RJ45 to PC. This means that the PORTB transmit pins are not transmitting.
I think this is because of the termination and biasing of the LVPECL outputs.
Could you please tell me what should I connect to 100base-FX differential signals of DP83849if to make the conversion from LVPECL to CML ?
Are you able to check link up status; is there a successful link? Please review the following and check your fiber optical transceiver: https://www.ti.com/lit/df/snlr002/snlr002.pdf Are you using a different transceiver?
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In reply to Nikhil Menon:
I am using different transceiver which has ac coupled differential CML inputs and output.
Linkup status is 1 . Please find the attached images for PORTA and PORTB registers values.
In reply to Yash Naik:
This seems to be a duplicate of another post, for better continuity I will close this thread. Please respond on the thread linked here: https://e2e.ti.com/support/interface/f/138/t/852412#.
If you are having further issues, please open a new thread.
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