Introduction to PRBS Test
9
SLAA750 – July 2017
Copyright © 2017, Texas Instruments Incorporated
DAC38RF8x Test Modes
1.7
PRBS Test Results
The PRBS test should now be running. Monitor the alarm pin using the oscilloscope for failures. If no
alarms are detected after a few seconds, the PRBS test is passing. Different PRBS tests can be
performed by selecting the desired test in the
SERDES and Lane Configuration
tab of the DAC38RF8x
EVM GUI and selecting the corresponding test in the HSDC Pro GUI SerDes Test Options. Additionally
the other lanes can be tested by selecting the desired lane from the
DTEST Lane Select
drop down in the
SERDES and Lane Configuration
tab.
2
Introduction to JESD204B Short Pattern Test
The DAC38RF8x also comes equipped with software to verify short pattern tests using the JESD204B
lanes. The JESD204B short pattern test is a quick and easy way for users to ensure that lane mapping
between the FPGA and DAC38RF8X is correct. The following section describes the test setup and
procedure for the JESD204B short pattern test using the TI EVMs and GUIs. To perform this test on a
different board or without the TI GUI software, configure the DAC into the desired state making sure to
include the register writes in
2.1
Required Hardware
This test procedure requires the following pieces of lab equipment:
•
DAC38RFxxEVM REV E board
•
TSW14J56 REV D board
•
5-V DC power supplies
•
Signal generator
2.2
Required Software
This test procedure requires the following software:
•
HSDC Pro Version 4.59 or higher
•
DAC38RFx EVM GUI
2.3
Hardware Setup
Follow these steps to set up the hardware:
Step 1.
Connect the TSW14J56 FMC interface connector (J4 of TSW14J56) to DAC38RFxx FMC
interface connector (J20 of DAC38RFxx EVM).
Step 2.
Connect the USB 2.0 Type A to Mini-B cable from the PC to DAC38RFxx EVM USB Mini-B
port (J16)
Step 3.
Connect the USB 3.0 Type A to Type B cable from the PC to TSW14J56 Rev D USB 3.0 B
port (J9)
Step 4.
Connect a 5-V power supply to the DAC38RFxx EVM board using J21.
Step 5.
Connect a 5-V power supply to the TSW14J56 board using J11.
Step 6.
Turn on the TSW14J56 board by moving switch 6 to the ON position.
Step 7.
Configure the signal generator to output 5898.24 MHz signal at 16 dBm, and apply signal to
the DACCLKP SMA connector (J1).
Step 8.
Install Jumper J10 to enable external clocking.
Step 9.
Connect the spectrum analyzer input to IOUTA (J6).
