[LimeSDR-USB] Synchronization and Toggle TDD/FDD Mode

[ccsh]

Quote from LMS7002M datasheet:

In TDD mode, a single PLL output drives both TX and RX mixers (…). Running the LMS7002M in single PLL mode has the following advantages:

• current consumption is significantly reduced since one PLL is powered down.
• fast TX<->RX switching time in TDD mode is achievable since the PLL does not need to relock.
• there is no TXVCO<->RXVCO polling issue since a single PLL is used.
• using the digital domain for LO frequency shifts enables implementation of very fast frequency hopping systems.

I am interested especially in checking fast TX/RX switching time.