On 07/12/2011 06:04 PM, Jie Zhang wrote:
> On Tue, Jul 12, 2011 at 3:24 AM, Martin Strubel <[email protected]> wrote:
> > Last time I tried, urJTAG was not usable with inhomogenous multi device
> > chains, so I'm afraid it is not supporting your configuration, unless
> > you find a way to make the SVF generator not use the header commands
> > (HDR/HIR). Or add support yourself.
>
> UrJTAG is designed to work with heterogeneous multi-device chains.
> It's only an implementation limit in SVF part of UrJTAG.
Dear Jie,
finally I localized the root of the problem and the solution:
I have a Digilent Nexsy2 Board and wanted to program the FPGA over
the Cypress FX2 USB controller on this board. So I used the
nexys2prog
script given by the name-like SourceForge project. This produced
the Warnings and Errors I described.
The UrJtag' documentation states in
http://urjtag.org/book/_jtag_commands.html#_highlevel_commands
clearly
"The SVF player operates on a single part in the scan chain"
So the svf file must be created for a JTAG chain which only contains
the part to be programmed.
nexys2prog calls Xilinx impact to create a svf file, and gives the full
JTAG chain of the board: TDI -> FPGA(xc3s1200e) -> PROM(xcf04s) -> TDO .
I've changed the nexys2prog procedure such that svf file for a FPGA-only
chain is created, and all is fine.
No Warnings anymore (there are still TID ect in the svf file, but now
all have a length field of 0, and this is silently ignored), and of
course no error anymore because the final SIR targets a single part.
I've notified the maintainer of nexys2prog too.
Thanks for all the help !!!
With best regards, Walter Mueller
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