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Texas Instruments DAC38RF8x Application Report

Test modes
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Kyle Addington
The DAC38RF8x family of devices comes equipped with multiple test modes to assist users in verifying
systems in rapid prototyping situations. This application report covers two of the available tests, the
pseudorandom binary-sequence test and JESD204B short pattern test, in detail using the TI
DAC38RF8xEVM and
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SLAA750 - July 2017
Submit Documentation Feedback
ABSTRACT
TSW14J56EVM
capture card.
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Copyright © 2017, Texas Instruments Incorporated
DAC38RF8x Test Modes
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Application Report
SLAA750 - July 2017
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DAC38RF8x Test Modes
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Summary of Contents for Texas Instruments DAC38RF8x

  • Page 1: Table Of Contents

    Wireless Infrastructure ABSTRACT The DAC38RF8x family of devices comes equipped with multiple test modes to assist users in verifying systems in rapid prototyping situations. This application report covers two of the available tests, the pseudorandom binary-sequence test and JESD204B short pattern test, in detail using the TI...

  • Page 2: Introduction To Prbs Test

    DAC registers is set to notify the user of a possible issue. The following sections outline the required steps to implement the PRBS test using the DAC38RF8x EVM by using the TSW14J56 capture card and corresponding TI GUI software. To run the test without using...

  • Page 3: Hardware Setup

    Step 1. Connect the TSW14J56 FMC interface connector (J4 of TSW14J56) to DAC38RF8x FMC interface connector (J20 of DAC38RF8x EVM). Step 2. Connect a USB 2.0 Type A to Mini-B cable from the PC to DAC38RF8x EVM USB Mini-B port (J16).

  • Page 4: Configuring The Dac38Rf8X

    3 step Step 1. Launch the DAC38RF8x EVM GUI and select the Quick Start tab (see Figure Step 2. Reset the board by clicking the Not in RESET button and then clicking the button again, after the button changes, to bring the board back out of reset.

  • Page 5: Dac38Rf8X Evm Gui Clocking Tab

    Active High or Active Low. Active high causes the alarm pin voltage to be set high if a PRBS error occurs. Figure 4. DAC38RF8x EVM GUI Alarm Monitoring Tab Step 7. Select the SERDES and Lane Configuration sub-tab (see Figure 5).

  • Page 6: Prbs Register Writes For Custom Setup

    Introduction to PRBS Test www.ti.com Figure 5. DAC38RF8x EVM GUI SERDES and Lane Configuration Tab Step 8. Select the JESD Block sub-tab (see Figure 6). Ensure that the Comma Align EN boxes are not checked. Figure 6. DAC38RF8x EVM GUI JESD Block Tab...

  • Page 7: Tsw14J56 Setup For Prbs Tests

    Open the drop-down menu in the top left corner by clicking the green arrow beside the Select DAC box. Select PRBS_DAC38RF8x_LMF_841_RevD. Click Yes in the window that pops up to update the firmware. SLAA750 – July 2017 DAC38RF8x Test Modes Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...

  • Page 8: Prbs Testing .Ini File Selection

    When the firmware is correct, the PRBS pattern is ready to be loaded. Under the Instrument Options menu, select SERDES Test Options. In the window that pops up, select the transmitter tab at the top. The DAC38RF8x EVM supports PRBS7, PRBS23, and PRBS31. Select the desired PRBS test and click the Apply button.

  • Page 9: Prbs Test Results

    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.

  • Page 10: Configuring The Dac38Rf8X

    Figure 11. DAC38RF8x GUI (4421 External Clocking Configuration) Step 3. Select the DAC38RF8x tab. In the Mixer section, check the Mixer enable box for Path AB . In the NCO section, check the NCO enable box for Path AB and set the NCO frequency to 1000-MHz.

  • Page 11: Register Writes For Custom Setup

    TSW14J56 SETUP for JESD204B Short Pattern Test After the DAC38RF8x EVM GUI has been properly configured, the next step is to send the pattern to the DAC. Follow these steps to configure the HSDC pro to send the pattern to the DAC: Step 1.

  • Page 12: Hsdc Pro Select Board Menu

    1 and tone center to 10-MHz (see Figure 16). In the Tone selection drop-down menu, select Complex and click the Create Tones button. Click the Send DAC38RF8x Test Modes SLAA750 – July 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...

  • Page 13: Short Pattern Test Procedure

    For sections containing more than one value, the pattern in the corresponding column cycles through the values instead of just repeating the one value. SLAA750 – July 2017 DAC38RF8x Test Modes Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated...
  • Page 14 Send button. The next step is to enable the short pattern test in the DAC. In the DAC38RF8x GUI, select the Low Level View tab. Scroll down in the list of registers to the DAC38RF8x section and then select register 0x10C.

  • Page 15: Jesd204B Short Pattern Test Results

    If the value changes to a 1, the alarm signal has been detected and the user's setup could have issues. Figure 19. DAC38RF8x EVM GUI Low Level View Tab Short Test Alarm Register NOTE: The register values in the GUI do not automatically update and can only be checked by using the Read Register button.
  • Page 16 IMPORTANT NOTICE FOR TI DESIGN INFORMATION AND RESOURCES Texas Instruments Incorporated (‘TI”) technical, application or other design advice, services or information, including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to assist designers who are developing applications that incorporate TI products;...

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