# Disabling serdes on ECP5UM-5G FPGAs to save power

**URL:** <https://yosyshq.discourse.group/t/disabling-serdes-on-ecp5um-5g-fpgas-to-save-power/47>\
**Category:** Users\
**Created:** [June 10, 2025, 6:37pm UTC](https://yosyshq.discourse.group/t/disabling-serdes-on-ecp5um-5g-fpgas-to-save-power/47 "2025-06-10T18:37:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![john.mamish](https://yyz2.discourse-cdn.com/free1/user_avatar/yosyshq.discourse.group/john.mamish/32/8_2.png) [@john.mamish](https://yosyshq.discourse.group/u/john.mamish)\
**Post date:** [June 10, 2025, 6:37pm UTC](https://yosyshq.discourse.group/t/disabling-serdes-on-ecp5um-5g-fpgas-to-save-power/47/1 "2025-06-10T18:37:23Z")

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Hey,

I’m developing an application using Lattice’s ECP5 evaluation board. I’m seeing significant power consumption (for my application) on the serdes power rails (VCCA, VCCA\_SERDES).

I’m going to try just instantiating all of the serdes and putting them in standby, but I wonder if there are settings that would normally be configured via a Lattice tool.

Thanks!  
John