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

[IgnasJ]

@DasSidG

However, after setting PD_VCO to 1, the register 0x011C is now back to 0xad43, which doesn’t make sense to me, as it should be changing different bits.

0x011C is affected by MAC so you read different value after changing MAC to 1. When MAC is ‘1’ you read/write SXR registers, and when MAC is ‘2’ you read/write SXT registers.