xc3s2000 doesn't meet timing

[alabarge]

Just curious if anyone else has had this problem. Using x3_SDF_R6 with Xilinx 11.4, and compiling the design with no modifications (other than changing the target device of course) I get the following timing errors from PAR. Timing is fine when using the xc3s1000.

----------------------------------------------------------------------------------------------------------
Constraint | Check | Worst Case | Best Case | Timing | Timing
| | Slack | Achievable | Errors | Score
----------------------------------------------------------------------------------------------------------
* TS_link_data_out = MAXDELAY FROM TIMEGRP | MAXDELAY | -3.748ns| 10.748ns| 32| 98077
"FFS" TO TIMEGRP "link_data_in" 7 ns | | | | |
----------------------------------------------------------------------------------------------------------
* TS_zbt_data_out = MAXDELAY FROM TIMEGRP " | MAXDELAY | -1.012ns| 10.012ns| 16| 10065
FFS" TO TIMEGRP "zbt_data_io" 9 ns | | | | |
----------------------------------------------------------------------------------------------------------

[amane]

Hi,
Release 7.0 for x3 SDF is compiled under following conditions

1. Device xc3s1000
2. Xilinx ISE 11.3
3. Matlab 2009a and 2009b
4. System generator 11.3


If the device is changed, a modified ucf is required .

Sincerely,
Amit Mane
System Engineer
Innovative Integration Inc

[alabarge]

Is there a ucf file available for the xc3s2000 device? If not, maybe I could just disable the area constraints?

[alabarge]

It turns out that by commenting out all the area constraints, PAR completes successfully and meets timing. Just FYI.