Knowledge Base Article

Are there any changes to the Fast PLL (FPLL) compensation value in Quartus® II version 4.0 SP1 when using the FPLL in the Stratix® EP1S40 device?

Description
Yes, the Quartus® II software versions 4.0 and earlier were over-compensating for the Regional Clock network delays by 400ps when using the corner FPLLs and by 1.99ns when using the side FPLLs to drive the RCLK network. Quartus II Version 4.0 SP1 fixes this bug. Customers using FPLLs to drive the GCLK network will not see this over-compensation when using Quartus II ver 3.0 SP1 and later.
Updated 3 months ago
Version 2.0
troubleshooting
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