analog.com interface spi_engine_ctrl_rtl 1.0 CMD_READY required 1 in required 1 CMD_VALID required 1 required 1 in CMD_DATA required 16 required 16 in SDO_READY required 1 in required 1 SDO_VALID required 1 required 1 in SDO_DATA required 8 required 8 in SDI_READY required 1 out required 1 in SDI_VALID required 1 in required 1 out SDI_DATA required 8 in required 8 out SYNC_READY required 1 out required 1 in SYNC_VALID required 1 in required 1 out SYNC_DATA required 8 in required 8 out