Re: gEDA-user: What's your way of syncing CPLD design and gschemsymbols???

[Christoph Lechner <cl0023-atMUNGEDl-mx_dot_de>]

Andy Peters schrieb:
> It might be easier to work backwards, from the schematic, and have it 
> back-annotate into the .ucf (user constraint file), which is the file 
> used by the Xilinx tools for pinouts (and timing specs, etc etc). 
It's true that ripping off everything exept the pairing
	Pin Names <-> Pin Numbers
from the gschem symbol is a snap compared to building/
updating a symbol from the Fitter report. But how would
you make sure that the user of gschem doesn't put an input
pin at an reserved location, i.e. a JTAG or PWR pin.
The timing issues following from forcing the Xilinx tool
to use a user-defined pin-out are non-trivial IMHO, at
least for CPLDs. So I guess it would be better regarding
timing issues to run Xilinx ISE (or another vendor's tool)
first and then go to gschem and create/update the symbol.

But nevertheless, I'm looking forward to the new FPGA
flow ...

The (at the moment) missing link between logic design
tools and gschem is a big show-stopper for the gEDA
suite, I guess.

- cl


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