Analog Devices ADRV9005 Reference Manual page 82

Reference Manual ADRV9001
DATA INTERFACE
The ADRV9001 transmit SSI data output can be looped back to receive the SSI data input using API adi_adrv9001_Ssi_Loopback_Set.
When the transmit and receive SSI run at the same clock rate, use the pattern generator and checker to verify the functionality of the whole
system SSI. Note that both the ADRV9001 TX and RX radio state must be in the "RF_ENABLED" state to ensure the TX/RX SSI is enabled
when setting the SSI loopback test function.
As mentioned previously, the SSI clock, strobe, and data have programmable delays. Configure these delays using adi_adrv9001_Ssi_De-
lay_Configure. The unit for the SSI delay is step. This aids to meet the timing specifications described in the SSI Timing Parameters section.
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