Texas Instruments DS90UB913A-CXEVM, User Manual, Page: 5 / 67

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Operation
5 SNLU135B – June 2013 – Revised April 2016
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Copyright © 2013–2016, Texas Instruments Incorporated
Introduction
1.3 Operation
Make sure S1, S2, JP8, JP13 of Serializer board and S1, S2, JP6, JP12 of Deserializer board are
configured as shown in
Figure 1-2 and Figure 1-3 .
1. Connect the DS90UB913AQ and DS90UB914AQ Evaluation boards using a coax cable.
2. Connect the 5-V power supply to Deserializer board (recommended current limit is 300 mA) and apply
power as shown in Figure 2-1 .
3. Look for the LED D2 to light up on the DS90UB914AQ board.
• If the LED is lit and stable, then the DS90UB914AQ is LOCKED to the FPD-Link III serial stream…
CONGRATULATIONS, you are up and running!
• If not, continue to the next section.
1.4 Troubleshooting the EVM setup
1. Check power supply polarity.
WARNING
Reverse supply polarity can damage the board.
2. Check to make sure there is sufficient current (300 mA) by checking that the voltage (5 V) is correct
using DMM.
3. Check to make sure there is a FPD-Link III signal by probing on both C16 AND C19 on SER board and
C6 AND C7 on DES board.
4. Monitor the LOCK signal at pin 4 (pin 3 is GND) of connector JP2 using oscilloscope on DES board.
Do not rely on visual inspection of D2 (Lock LED) present on deserializer board.
5. With no PCLK input applied on SER board, PCLK output frequency on DES board should be 50MHz
for the default settings.
Table 1-1. PCLK Output (on DES) without Applying PCLK Input (on SER)
Mode Selected PCLK Output Expected
10 bit mode (default mode) 50 MHz
12 bit low frequency mode 25 MHz
12 bit high frequency mode 37.5 MHz
6. Go back to Figure 1-2 & Figure 1-3 to double check factory settings.