The section controls the setup of the digital
interface as well as test modes and digital
features such as decimation and loopback
The general setup tab includes
controls for the digital RX interface
Initial EVM Setup and Basic Test Procedure
4.2
RX Path Using TSW1200
First the AFE722x digital interface needs to be configured to match the serial LVDS interface that the
TSW1200 is expecting. The following control registers need to be set in the
‘
General Setup
’
tab of the
AFE722x programming software. Also the USB communication warning sign should be monitored after the
USB reset to ensure proper communication with the AFE722x EVM.
Register Bit
Setting
Interface
Serial LVDS
Master Override
Enabled
Format
Offset Binary
Serial LVDS
2 Wire
Data Orientation
MSB First
SDR Mode
Disabled
Wordwise Output
Disabled
Bitwise RX
Disabled
Halfrx in 2wire
Disabled
In the TSW1200 software, the AFE722x should be selected as the ADC. Next the sampling rate and ADC
input frequency need to be entered and the TSW1200 software will calculate the coherent frequency.
Performing a capture should yield:
Fs=122.88Msps
Fin= 9.98625MHz
5
SLOU330
–
December 2011
EVM Description
Copyright
©
2011, Texas Instruments Incorporated
