DLPLCRC410EVM: Regarding the D2 LED lighting up red

Hello Yoshitaka-san,

Your translator is quite good.  The question is very understandable.

When D2 stays red, do you have the EVM attached with USB?

Please try the following:

1. Remove any USB connection
2. Power up the board
   1. If D2 remains red are the default patterns showing?
   2. If the adjacent LED (D16) turns green are default test patterns showing?

D2 shows that the APPS_FPGA (Virtex 5 LX50) is attempting to configure from the PROM connected to the APPS_FPGA.  If configuration is successful and the design starts running on the FPGA then D2 should turn off and D16 should turn green.

What is the amperage capacity of the power supply you are using?  It should be at least 5 amps.  If the supply is nominal, it could be possible to not configure.

Also please check the voltage where the 5 V enters the board.  

If you have a good lab bench supply (at least 6 amp capacity) you can test with it.  If the voltage at the entry point is a little low, then adjust the lab supply so that it is at 5 V after it reaches the board.

Fizix

Thank you for your solution.

EVM have attached with USB.
Basically it is normal, but this phenomenon occurs when it is used continuously.

When D2 is lit red, the default pattern is not displayed on the DMD and the DMD is not recognized by the GUI

The amperage of the power supply you are using is fine.
When I turn on the EVM switch again after about 20 minutes, the red color of D2 disappears and the adjacent LED turns green.

Is there any other cause other than a damaged PROM or power supply problem?
For example, the DMD is getting too hot, etc.

Thank you in advance.

Hello again Yoshitaka-san,

The DMD getting hot will not affect the FPGA configuration.

Help my understand, is this a "cold" boot issue?  Does it happen after the system has been off for a while, or after it has been on for a while and you try to power cycle the system and the boot fails.

Do not rule out a power supply issue simply because the amperage capacity of the power supply seems to meet the specification.  We have seen cases where the voltage droops even with power supplies that advertise sufficient current.  That is why I suggest trying a different power supply or a bench supply just for testing to rule out a power supply issue.

You could probe the PROM clock line with a scope to see if it is generating the clock when it comes up.  On this system the PROM generates the clock.  If the clock is not generated it will not configure and the FPGA will remain in reset with D2 being red.

Fizix

Thanks for the reply.

For example, we run EVM for about 20 minutes. Then once I shut it down and turn it on a few minutes later, D2 remains red. However, after about 20 minutes of time, it started up normally.
Is it a power cycle issue, or is the EVM not cooling well enough, although it is cooled by a heatsink and fan?

As you advised, the current value of the power supply may not be stable. I will try with another power supply.

Thank you very much.
If this problem is not solved I will ask you a question.
Best regards.

Hello again Yoshitaka-san,

Yes please let me know the results.  It may not be a power supply issue, but I would like to rule it out.

Fizix