Search found 1318 matches

by mon2
Fri Jan 18, 2019 5:17 pm
Forum: Processors
Topic: XU216 memory range guarenteed to be untouched and DFU
Replies: 2
Views: 6685

Re: XU216 memory range guarenteed to be untouched and DFU

I think it will be best for you to raise a support ticket using the xmos.com website so that the proper staff member can reply on this low level technical question. On a privileged few will know the correct answer. Please update this post once you receive a reply.
by mon2
Thu Jan 17, 2019 3:15 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

When you reflash the IP, do you power cycle the power supply / your custom PCB? Or do you hot swap connect the XTAG interface? Still concerned about possible in rush current / transients from the +24v feed over the fair length copper cabling. Let us see the results of your PC power supply @ +12v inp...
by mon2
Wed Jan 16, 2019 2:43 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

What are the details of your JTAG (XTAG) programmer interface and wiring? Are you on the same ground potential for your XMOS target board and the PC used for programming the target CPU via XTAG? Is the XTAG tool known to be working otherwise with other kits? Is the FLASH external to the CPU? If yes,...
by mon2
Wed Jan 16, 2019 5:13 am
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

More thoughts.. 1) if you take a virgin board and power cycle (without any IP), does this same board continue to work at the end of xx power on / off cycles? Can you detect the board ok with the toolchain? Do not load your IP yet in these tests but perform only a flash erase at most. 2) if the above...
by mon2
Tue Jan 15, 2019 4:31 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

Hi. Still have skeleton details on your application and it is difficult to go back and forth on the requests due to very little free time. Consider: 1) Replace the external power supply with a quality standard PC power supply and apply the +12V rail to your black box design. The switchers should be ...
by mon2
Mon Jan 14, 2019 8:34 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

In the posted schematic, the 1v0 rail is powering up based on the RC enable circuit? However, the enable is based on a 5v0 rail input. The proper solution is to use the same 3v3 rail that is powering the XMOS CPU -> wait till the threshold is reached on the 3v3 rail (often through a PG = power good ...
by mon2
Mon Jan 14, 2019 1:41 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

To move forward, it may be best to post a (partial) schematic and if possible BOM with details of the parts used in the assembly for at least the components dealing with the XMOS CPU. 3V3 ramps up over 4ms then 1V ramp 10ms later over about a 4ms ramp as well. Do you have control over the delay betw...
by mon2
Mon Jan 14, 2019 12:17 pm
Forum: Processors
Topic: USB and internal xlinks failing over time
Replies: 21
Views: 728

Re: USB and internal xlinks failing over time

Review these article to be sure you are not facing the same issue: https://www.analog.com/media/en/technical-documentation/application-notes/an88f.pdf And https://www.xcore.com/viewtopic.php?f=37&t=5808&p=29561&hilit=Marc+surge#p29561 No complaints of similar failures from XMOS with othe...
by mon2
Mon Jan 14, 2019 4:50 am
Forum: Applications
Topic: USB Audio self-powered not detecting cable removal/insert
Replies: 14
Views: 11889

Re: USB Audio self-powered not detecting cable removal/insert

I think this article details the events you saw and highlights why in-rush protection is vital...

https://www.analog.com/media/en/technic ... /an88f.pdf

Code: Select all

https://www.analog.com/media/en/technical-documentation/application-notes/an88f.pdf