V4 FX12 and PLB TEMAC: no space for user logic?

A. Nolson alohanono at gmail.com
Thu Feb 14 03:33:17 EST 2008

Hi ,

I am now developing my own IPs and when I try to synthesize normally I 
get an error because the router finds no place to fit everything. I have 
resynthesized using the option:

XIL_PAR_ENABLE_LEGALIZER=1 ( loading the program with that variable on > 
XIL_PAR_ENABLE_LEGALIZER=1 xps). It took so much time because it uses a 
much more consuming algorithm but I managed to build it correctly.


llandre wrote:
> Hi Mohammad,
> I've just had a look at the messages you generously posted in the ml 
> about your experience with linux on V4 FX12 FPGA.
> I'd like to ask your opinion about FX12 practical usability in this 
> context (gigabit PLB TEMAC/linux).
> In this message
> http://article.gmane.org/gmane.linux.ports.ppc.embedded/16816
> you say the device is completely full. If I understand correctly your 
> system provides just the devices required to run the bandwidth test so 
> it seems there is no room for user logic (I think you did not even add 
> the memory controller required to access the NOR Flash containing 
> bootloader, kernel image and root fs that is clearly mandatory for 
> standalone product). Is that true? If it is, this limits a lot the 
> flexibility of this architecture in this configuration. What do you think?
> Regards,
> llandre
> DAVE Electronics System House - R&D Department
> web:   http://www.dave.eu
> email: r&d2 at dave-tech.it
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