Integrating XTAG2 into a PCB

Technical discussions around xCORE processors (e.g. General Purpose (L/G), xCORE-USB, xCORE-Analog, xCORE-XA).
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rp181
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Integrating XTAG2 into a PCB

Postby rp181 » Sun Jun 05, 2011 6:23 pm

I am designing a system using the L2 processor. I would like USB connectivity, for programming and data transfer. I need all the IO on the L2, so I will be using another L1 to handle the USB.

If I copy the XTAG2 schematic (allowed in license), what kind of software do I need to load onto the L1. the MODE pins are configured to boot from SPI, am I right in thinking that this is basically booting from USB?

Is the XTAG code available anywhere?
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Andy
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Postby Andy » Sun Jun 05, 2011 7:52 pm

Hi rp181,

You'll need to program the OTP with the USB bootloader. All the code you need is available on Github here:

https://github.com/xcore/proj_xtag2
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rp181
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Postby rp181 » Mon Jun 06, 2011 1:56 am

Ok. Will there be a problem programming it while the output is connected to the L2 device, or do I need to program it before connecting?

Also, the XTAG has a component called FB1 in series with the VBUS line on the USB connector. What is this? the schematic says its rated 1700ma and 330R.

Do I need to connect VBUS? I plan on having external 5v.
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leon_heller
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Postby leon_heller » Mon Jun 06, 2011 8:31 pm

FB indicates a ferrite bead.

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