XCore Exchange

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?

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

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.

FB indicates a ferrite bead.