Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
16612 Discussions

problem in Fitter

Altera_Forum
Honored Contributor II
‎10-25-2010 11:04 PM
1,346 Views

Hi, 

 

I am using Quartus 9.1 Service Pack 1 Web Edition. 

 

The device is Cyclone III, EP3C16E144I7 

 

The summary of my design is : 

 

Total logic elements 15338/15408 (100%) 

Total combinational functions 15204/15408 (99%) 

Dedicated logic registers 7999/15408 (52%) 

 

But the Fiiter is not successful, which says: 

 

Fitter requires 966 LABs to implement the project, but the device contains only 963 LABs. 

 

 

Why is that? From the summary, it seems I have not exceeded the capacity of the device. What is the relation between logic elements and LABs? 

 

Thank you!
0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎10-26-2010 05:44 AM
295 Views

Basically the LAB's are a routing resource for interconnection that you have over-utilized.  

 

Typically, when you are not 100% full, it can also use LE's for routing, but in your case, you have already used almost all the LE's. Try moving some of you logic to ram blocks if you can. 

or reducing the design by optimizing for area versus speed. Or remove non-critical logic. 

 

Pete
0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.