Re: [UrJTAG-dev] Error svf: could not establish SIR instruction

[Vaclav P. <vac...@gm...>]

Hello,

I finally found what "Unknown stepping" means and how to fight with
"Part 0 without active instruction" message.

Unfortunately, in the documentation on WWW pages (
http://urjtag.org/book/index.html ) there is nothing. I added another
line into STEPPINGS file in the xilinx/xc9572xl_vq44 directory. And
added new BSDL file from Xilinx (first it was converted to UrJTAG
format). Can anybody extend the documentation about the structure of
BSDL files and what to do if "Unknown stepping" appears ?

Then the chip was detected properly. I had to lower "FREQUENCY" in SVF
from 1E6 to 3E5 (I don't know why 1MHz TCK is too fast for my CPLD)
and everything works as expected now.

Thank you for help.
Vaclav

2010/2/14 Mike Frysinger <va...@ge...>:
> On Sunday 14 February 2010 14:40:07 Vaclav Peroutka wrote:
>> jtag> detect
>> IR length: 8
>> Chain length: 1
>> Device Id: 01011001011000000100000010010011 (0x0000000059604093)
>>   Manufacturer: Xilinx
>>   Part(0):         XC9572XL_VQ44
>>   Unknown stepping!
>> chain.c(149) Part 0 without active instruction
>> chain.c(200) Part 0 without active instruction
>> chain.c(149) Part 0 without active instruction
>
> you should probably fix these errors first
> -mike
>