I have big problem with the XTAG-2. From 20 custom boards 10 are not working.
I testet with xflash -l (11.1.0 build 2237) and the defect boards answer with:
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C:\Users\GantnerR>xflash -l
Available XMOS Devices
----------------------
ID Name Adapter ID Devices
-- ---- ---------- -------
0 XMOS XTAG-2 rvZSJE0E None
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C:\Users\GantnerR>xflash -l
Available XMOS Devices
----------------------
ID Name Adapter ID Devices
-- ---- ---------- -------
0 XMOS XTAG-2 rvZSJE0E L1[0..3]
The board has 2 XS1-L2 and the schematics around the jtag is identical to the “Motor Control Platform” Version 1V1.
It buffers the RST_N and the TRST_N with a open collector buffer (NC7WZ07P6X) and the TMS and the TCK are buffer with a NC7WZ17P6X.
I tried also to reduce the jtag speed by
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Xflash –l –jtag-sped 100
Is there an other way to change the jtag speed on the XTAG-2 ?
By the way the "RST-N" on Pin 15 on XTAG-2 is never activated.
Of course it could by a soldering problem – but 10 out of 20 are to many with exactly the same problem.