Hi CASPER team,
I wanted to test the iADC tutorial on my ROACH but I can't.
I followed the tutorial changing XSG core from iBOB to sx95t and removing
ibop_lwip from original design. Simulation worked perfect but when I start
bee_xps the following error appears after a while twice:
ERROR: 2 constraints not met.
PAR could not meet all timing constraints. A bitstream will not be generated.
I saw what Mark Wagner recommended to see:
<model_directory>/XPS_ROACH_base/implementation/system_map.mrp
The thing I have here is a large file but I suspect that the problem is
around this part:
Asterisk (*) preceding a constraint indicates it was not met.
This may be due to a setup or hold violation.
----------------------------------------------------------------------------------------------------------
Constraint | Check | Worst Case |
Best Case | Timing | Timing
| | Slack |
Achievable | Errors | Score
----------------------------------------------------------------------------------------------------------
* NET "iadc_test_adc/iadc_test_adc/adc_clk_ | MAXPERIOD | -1.666ns|
| 1| 1666
buf" PERIOD = 10 ns HIGH 50% | MINLOWPULSE | 4.666ns|
5.334ns| 0| 0
----------------------------------------------------------------------------------------------------------
* PERIOD analysis for net "iadc_test_adc/ia | SETUP | 8.535ns|
1.465ns| 0| 0
dc_test_adc/adc_clk_dcm" derived from NE | HOLD | 0.148ns|
| 0| 0
T "iadc_test_adc/iadc_test_adc/adc_clk_bu | MINPERIOD | 7.779ns|
2.221ns| 0| 0
f" PERIOD = 10 ns HIGH 50% duty cycle co | MAXPERIOD | -1.666ns|
| 1| 1666
rrected to 10 nS HIGH 5 nS | | |
| |
----------------------------------------------------------------------------------------------------------
Both constraints have a MAXPERIOD of -1.666ns, I don't know that a minus
have to do here with time, but is what the report says.
Do you have any insights of this?. Or I just disable the PAR timing check?
Best!
Daniel Herrera
