2397358_en-US

LX2160A: Pull down value on receiver for SerDes lanes not used

Hello,

Chip: LX2160A

The application note AN5407 specifies pull down on SerDes lanes if not used:

If some SerDes lanes are a no-connect, pull down their receiver pins to GND.

Could you tell me the pull down value please? Or should I connect the receiver pins directly to GND?

Thanks.

Re: LX2160A: Pull down value on receiver for SerDes lanes not used

Hello,

The AN5407 language "pull down their receiver pins to GND" is intentionally ambiguous about method — NXP's clarification is that a direct 0 Ω connection to GND is the correct and preferred approach.

SerDes power-down

Even with the RX pins tied to GND, if the SerDes block remains powered, AN5407 also recommends powering down unused lanes via firmware: configure the General Control 0 register during the PBI phase to power down unused SerDes lanes. If the entire SerDes block is already powered down, individual lane power-down is not needed

Regards