# TDD mode and SoapySDR

**URL:** <https://discourse.myriadrf.org/t/tdd-mode-and-soapysdr/2830>\
**Category:** LimeSDR\
**Created:** [17 May 2018 18:01 UTC](https://discourse.myriadrf.org/t/tdd-mode-and-soapysdr/2830 "2018-05-17T18:01:37Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mzs](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/mzs/32/2678_2.png) [@mzs](https://discourse.myriadrf.org/u/mzs)\
**Post date:** [22 May 2018 12:08 UTC](https://discourse.myriadrf.org/t/tdd-mode-and-soapysdr/2830/5 "2018-05-22T12:08:08Z")

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> [@\[LimeSDR-USB\] Synchronization and Toggle TDD/FDD Mode](https://discourse.myriadrf.org/t/limesdr-usb-synchronization-and-toggle-tdd-fdd-mode/1791/5):
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> TDD mode for LMS7002M is activated via configuration. The idea is to use only one PLL (SXT) for both Rx and Tx chains. Here are steps on how to do it using LimeSuiteGUI: Starting setup is as a normal FDD mode (both RX and TX synthesizers are working). Set register 0x011C[6] = 0 while 0x0020[1:0] = 2 (or SXT tab is selected in LimeSuiteGUI - uncheck control check box called “LO buffer from SXT to SXR” under “Power down controls”). Set 0x011C[1] = 1 while 0x0020[1:0] = 1 (or SXR tab is selected…

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