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LukiLeu's avatar
LukiLeu
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2 months ago

Quartus crashes on long carry chain in Agilex 5 FPGAs

We try to manually place a carry chain in the Agilex 5 FPGAs which consists of more than 40 LABs. When we place this carry chain using set_location_assignment, Quartus crashes during the placement ph...
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ZiYingE_Altera's avatar
ZiYingE_Altera
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2 hours ago

Hi LukiLeu​, 

I am Zi Ying and am currently assisting Kenny with this support ticket while he is out of the office.

I also heard from Kenny about your bike accident. Wishing you a smooth and speedy recovery.

Based on feedback from our internal engineering team, Agilex 5 supports approximately 46 to 47 LABs within a single continuous sector. As such, a single uninterrupted 50-LAB carry chain is not expected to fit on this device.

To help us determine the best next step, could you please confirm the minimum continuous carry-chain length required for your TDC to meet its reliability and accuracy targets? For example, would 43 LABs as your original design be sufficient, or is a chain close to 50 LABs essential?

This information will help us determine the most appropriate workaround for your design.

Thank you!

Regards, 
ZiYingE_Altera