Texas Instruments FPD- Link LVDS to FPD-Link II Embedded Clock LVDS Converter DS99R421 Evaluation Kit FPDXSDUR-43USB/NOP FPDXSDUR-43USB/NOPB Data Sheet
Product codes
FPDXSDUR-43USB/NOPB
National Semiconductor Corporation
Date: 5/12/2008
Page 23 of 39
Page 23 of 39
Troubleshooting
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 Power and Ground are connected to both Tx AND Rx boards.
2. Check the supply voltage (typical 3.3V) and also current draw with both Tx and Rx
boards. The Serializer board should draw about 55-65mA with clock and all data
bits switching at 43MHz, (R
bits switching at 43MHz, (R
PRE
=9K
Ω). The De-serializer board should draw about
75-85mA with clock and all data bits switching at 43MHz, (minimum ROUT loading).
3. Verify input clock and input data signals meet requirements for VILmin, VILmax,
VIHmin, VIHmax, tset, thold), also verify that data is strobed on the selected
rising/falling (RFB pin) edge of the clock.
rising/falling (RFB pin) 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.
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 Translator and
De-serializer boards to make sure that the devices
are enabled (/PD=Vcc) for operation. Also check
DEN on the Serializer board and REN on the
Deserializer board is set HIGH.
are enabled (/PD=Vcc) for operation. Also check
DEN on the Serializer board and REN on the
Deserializer board is set HIGH.
The devices are pulling more
than 1A of current.
than 1A of current.
Check for shorts in the cables connecting the
Translator and RX boards.
After powering up the demo
boards, the power supply
reads less than 3V when it is
set to 3.3V.
boards, the power supply
reads less than 3V when it is
set to 3.3V.
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.