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NOTE: Users should only perform one of the last three register writes which corresponds to the
desired PRBS test. After performing the register writes, send the pattern to the DAC though
the FPGA connection.
1.6
TSW14J56 SETUP for PRBS Tests
When the DAC has been configured properly, the PRBS pattern is ready to be sent. Launch the HSDC
Pro application and navigate to the Quick Start tab. A window pops up asking the user to select a device.
Select the TSW14J56 RevD board and click the OK button (see
A box pops up indicating that no firmware is connected. Click the OK button and switch to the DAC tab in
the HSDC Pro application by using the tabs located at the top of the window (see
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
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Table 1. Register Writes for Custom Setup
Address
Bit
0x00
14, 13
0x3E
14
0x1B
11:8
0x4F
0
0x4F
0
0x3D
15:12
0x3D
15:12
0x3D
15:12
Figure 7. HSDC Pro Select-Board Menu
Figure 8. HSDC Pro DAC Tab
Copyright © 2017, Texas Instruments Incorporated
Introduction to PRBS Test
Value
Function
1, 1
Enable alarm output active high
1
Align disable
0x3
Set DTEST to TESTFAIL
0
Uncheck Comma Align En
0
Uncheck Comma Align En
0x2
To Select PRBS7
0x3
To Select PRBS23
0x4
To Select PRBS31
Figure
7).
Figure
DAC38RF8x Test Modes
8).
7
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