Texas Instruments FPD Link III - DS90UB901Q & DS90UB902Q EVK SERDESUB-16USB/NOPB SERDESUB-16USB/NOPB 데이터 시트
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SERDESUB-16USB/NOPB
28
SERDESUB-16USB User’s Guide
SNLU100 – April 2012
Troubleshooting Demo Setup
NOTE: The DS9UB901Q and DS9UB902Q are NOT USB compliant and should not be
plugged into a USB device nor should a USB device be plugged into the demo
boards.
plugged into a USB device nor should a USB device be plugged into the demo
boards.
If the demo boards are not performing properly, use the following as a guide for quick
solutions to potential problems. If the problem persists, please contact the local Sales
Representative for assistance.
QUICK CHECKS:
1. Check that Powers and Grounds are connected to both Serializer and Deserializer
boards.
2. Check the supply voltage (typical 1.8V) and also current draw with both Serializer and
Deserializer boards. The Serializer board should draw about 70mA with clock and all
data bits switching at 43 MHz. The Deserializer board should draw about 100mA with
clock and all data bits switching at 43 MHz.
data bits switching at 43 MHz. The Deserializer board should draw about 100mA with
clock and all data bits switching at 43 MHz.
3. Verify input clock and input data signals meet requirements (VIL, VIH, tset, thold), Also
verify that data is strobed on the selected rising/falling (RFB register) edge of the clock.
4. Check that the Jumpers and Switches are set correctly.
5. Check that the cable is properly connected.
TROUBLESHOOTING CHART
Problem…
5. Check that the cable is properly connected.
TROUBLESHOOTING CHART
Problem…
Solution…
There is only the output clock.
There is no output data.
Make sure the data is applied to the correct input pin.
Make sure data is valid at the input.
Make sure data is valid at the input.
No output data and clock.
Make sure Power is on. Input data and clock are
active and connected correctly.
Make sure that the cable is secured to both demo
boards.
Power, ground, input data and
input clock are connected
correctly, but no outputs.
input clock are connected
correctly, but no outputs.
Check the Power Down pins of both Serializer and
Deserializer boards to make sure that the devices are
enabled (PDB=Vdd) for operation.
enabled (PDB=Vdd) for operation.
The devices are pulling more
than 1A of current.
than 1A of current.
Check for shorts in the cables connecting the
Serializer and Deserializer boards.
After powering up the demo
boards, the power supply
reads less than 1.8V when it is
set to 1.8V.
boards, the power supply
reads less than 1.8V when it is
set to 1.8V.
Use a larger power supply that will provide enough
current for the demo boards, a 500mA minimum
power supply is recommended.
power supply is recommended.