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Microcontrollers & FPGAs / Re: Cortex M, DMA SPI to external RAM
« Last post by ZeroResistance on Today at 04:05:01 pm »
You did not say what sort of interface your external memory has, but yes, probably.  Worst case, you might need intermediate ping/pong buffers on the chip between two different DMA, one incoming from the SPI, the other outgoing to your memory.  But note that DMA capability is not a property of Cortex M, but rather a peripheral added by the manufacturer (ARM licensee).  So ST Micro, NXP, etc. each have their own DMA implementation, and you would need to study the reference manuals carefully to verify the specifics for each processor.

You are correct, the DMA seems to have 2 ports, 1 memory port and 1 peripheral port.
So what you say may be needed to be done.
ST block diagram attached.
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Yes I've contributed to Ro Khanna, and I watch TYT fairly frequently  ;D
I actually stopped watching TYT contents - while it is factually sound it is a bit too biased towards the left. While I am a left-winger I want to try understand why right-winger do certain things.
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I have also seen his video but it didn't look like he is british  :-//
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I have something similar happening on one of my E4406A's and I traced it to the relay right after where 7dB attenuator output connects on the board. Of course the IC is unobtanium and seems to use an undocumented aspect of the original part (driving +/- 9V rather -9 to 0V). So far I haven't been successful in finding a drop in replacement.

You might want to take a look there and see if it is the same issue.

TonyG
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Test Equipment / Re: Hacking the Rigol MSO5000 series oscilloscopes
« Last post by pmnxis on Today at 03:51:24 pm »
I got one MSO5074.
I though I can dump many times with high bandwidth for data aquctation.
but it's not possible.

Hope someone analysis this system. and make me code some custom programming with it's own component.
I looked some program binary but too huge lol
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photonicinduction would be my guess

https://www.youtube.com/user/Photonvids




He reminds me of FPS Russia

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Repair / Gigabyte Intel NUC Failure
« Last post by gnif on Today at 03:47:32 pm »
Hi All,

I was given a i7 nuc that appears to have had a PSU fault. The device powers on and the 1.8V, 3.3V and 5.0V rails are all stable, however it just let the magic smoke out of the CPU fan where it's dumping unregulated 19V into, so it seems the 12V regulation has failed. I am trying to trace it though but need to identify a 5 pin device that I think is a MOSFET, marked what looks like Q5RDT.

See attached.

This device is connected to the resistor just above PQ6 which is controlling PQ6's gate. At power on the gate is pulled low and 19V is produced on the other side. A continuity check shows a connection between the output of PQ6 and the CPU fan power pin. I would have thought that this signal should be switched as some kind of switching regulator producing the 12V, but I could be completely wrong. Any advice would be greatly appreciated.
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We know him well.  He did have some marital problems -

Wife #1 dumped him: https://www.youtube.com/user/PhotonsWife
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Test Equipment / Re: Test Equipment Anonymous (TEA) group therapy thread
« Last post by VK5RC on Today at 03:41:38 pm »
I promise there will be no more Gratuitous HP Logo shots for at least a day or two ;) Daylight shot with the shack lights on behind as well and still plenty of power under it, light Raster engraved outline only. Think I like this more than the fully engraved logo.
Looks really cool!
Rob
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