ISE/EDK 6.3 vs 7.1...

[Big Boy]

I tried both ISE/EDK 7.1 and 6.3 (all with latest service pack, but tested very quicly), and I'm having some problems with 7.1. For example, a Microblaze design that fit in 6.3 doesn't fit as tight in 7.1. Moreover, I'm using Spartan-3 (FG456, speed: -4) with 66.6MHz clock, and I can't meet the timing requirement in 7.1, while 6.3 meet it. Moreover, for the same design, 6.3 give 6 level of logic in the critical path, while 7.1 give 9 levels.

Also, with 7.1, when doing synthesis, I get a lot of warnings, like 'Packer: ... can not be packed with the carry due to conflict ...'. Some other warnings too. With 6.3, no such warnings.

I'm currently testing on a workstation with 6.3, and I'll verify if some of the other issues I was having are there or not.

Anyone having bad experience with 7.1?

 

[pisoiu]

Yes. I cannot remember exactely what happened, but suddenly a lot of errors appeared with a design which was ok in 6.2, most of them at synthesis. I quickly remembered to not try to fix somthing wihich works fine, and since I had not ehough time to go through this, I dropped it.

/pisoiu

 

[mystery]

I also faced with similar problems with ise 7.1
One of my designs can be synthesized by 6.3 successfully , but my computer crashes when i try to syntesize with 7.1

 

[ukapil]

i think 7.1 is very unstable. In my design it automatically instantiates extra DCM.