This is the Texas Instruments RF Chip TRF6151C

It includes a VCO, Mixers, etc.

The TSP to the TRF6151 uses three wires: * CLOCK (regular CLK_13M) * STROBE (generated by TPU) * DATA (provided by TPU at falling edge of CLOCK, TRF samples data at rising edge of CLOCK)

[[Image(Rita:trf6151_serial_1.png)]]

[[Image(Rita:trf6151_serial_2.png)]]

The timings have been confirmed by the measurements below:

[[Image(Rita:trf6151_tsp.png)]]