Boot Modes for 3 x XL216 TQ128 design

Technical discussions around xCORE processors (e.g. xcore-200 & xcore.ai).
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CousinItt
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Post by CousinItt »

That's very useful - thanks for the update. I've looked for some more info and I can't find much. That snippet from the XN specification I quoted earlier refers to a line of devices, so clearly there should be some way in which it can work. The only other thing I've found is for the first generation devices in XS1 Link Performance and Design Guidelines which shows more than one device booting from a single flash, which says the first bootee has to use X0LB (presumably replaced by XL0 in the XCORE-200) but then adds
All slave devices are connected in the master-ward direction using X0LB
and
Any free outgoing link can then be used to boot further downstream devices.


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CousinItt
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Post by CousinItt »

cluster_small.jpg
(129 KiB) Not downloaded yet
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Well, at last, here it is. Booting from flash works well, and all local links are rock solid at two clocks.

A couple of things I've noted:

1) For the xscope link to work the JTAG connection needs to be really short. I started off with a few more cm of JTAG ribbon cable and no joy.

2) I should have allowed for more flexibility in the VCC supply converter. Power up isn't monotonic, but adding a feedback capacitor and a bigger output cap fixes it. Fortunately there are places I can tack these parts on, and I'll include them properly in the next revision.

At the moment I'm using the IS25LQ016B. I'll also experiment with the LP part.
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CousinItt
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Post by CousinItt »

Hi all,

I'm hoping to resurrect this thread. Can anyone explain what XN file settings you use to get a system to boot where there is an indirect connection to the flash? For example, with Redeye's flash connected to X1, how does X3 boot?
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