xc3sprog "instruction capture is 0x3f" (solved)

Hi,

if anybody else runs into the same problem with an FPGA module:

xc3sprog failed to upload the bitstream to a Spartan 6 LX45, complaining "instruction capture is 0x3f". The JTAG chain itself was recognized, it reported the device correctly.

The cause was insufficient 3.3 V supply voltage on the FPGA board, measured at around 3.08 V. Some modification to the LM1117 adjustment resistors brought it back up to

3.3 V and the board works again.

Don't know if all variants of this regulator have overcurrent protection, maybe it was damaged by earlier abuse.

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mnentwig
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or not. The problem re-appeared, probably the board is broken.

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mnentwig

Please let me know if the problem comes out as not hardware related.

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Uwe Bonnes                bon@elektron.ikp.physik.tu-darmstadt.de 

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt 
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Uwe Bonnes

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