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FMC176 Corrupted Waveforms

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curryj:
Hello,

I currently have two FMC176 boards in my posession: serial numbers 0038 (v1.0, MMCX) and 0054 (v1.1, SSMC). Both are producing corrupted waveform data on D0, but the data on D1 is fine.

I am running both boards on an ML605 with the unmodified FMC176/ML605/Ethernet reference design and its unmodified host application. This design outputs a 300MHz sine wave on both D0 and D1.

From a cold start, 0038 looks correct on both channels for the first 30-60 seconds. See the attached file 20130924_FMC176_0038_1.png (yellow trace=D0, green trace=D1). After that, the D0 waveform is corrupted; see 20130924_FMC176_0038_2.png (yellow trace=D0, green trace=D1).

0054 works somewhat more reliably, but still does output corrupted data. For the first ~30-60 minutes of operation in a recent test, I observed no corrupted data. After that, every minute or two it goes through fits where it outputs corrupted data on D0. An example is shown in 20130924_FMC176_0054.png (yellow trace=D0, green trace=D1).

I am blowing a table fan over my setup, as recommended to me by 4DSP staff. Both cards read temperatures under 50C even after extended operation. What possible causes are there for this? Any suggested solutions?

Another observation I've made is that when the waveforms are correct, the amplitudes of the waveforms output by 0038 are larger than those output by 0054. The software and firmware used by both cards is identical. Did something change in the hardware between v1.0 and v1.1?

Thank you!
Jim

Kyu:

Jim,


Revision 1.1 improves the power design and a PCB layout. You can adjust the DAC gain using 0x20 and 0x21 registers in DAC. Please refer to the AD9129 datasheet.


I have been running r1.0 for more than 1.5 hr and both D0 and D1 has not currupted. Are you using the latest firmware and software? If you are not, could you install the latest BSP and try it again?


Thanks,
Kyu

curryj:
Kyu,

Thanks for your reply. I do think I am using the latest firmware and software. I downloaded and installed the BSP from http://www.4dsp.com/BSP/4FM/4FM.SDK.zip yesterday.

The 4FM Getting Started Guide says I have r4.8. My 4FM GUI Control Application lists a BSP Verson of 2.210.1 and a BSP Installer Date of 20 Sep 2013. Is this the latest?

Jim

Kyu:
Jim,


Yes, that is the latest BSP.


Kyu

curryj:
So, what should my next troubleshooting steps be?

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