TMC-20053: DSP Inputs Driven by High Fan-Out Net

Description

DSP data inputs were driven by a net with fan-out more than a user configurable threshold (default 500).

Parameters

Name Description Type Default Value Min Value Max Value
DSP_High_Fanout_Net_Threshold Fanout theshold for High Fanout Net (HFN) in DSP check integer 500   1
DSP_Chain_Threshold Chain-length threshold for unregistered DSP chain connections integer 2   1
DSP_Check_User_WYSIWYGs Check directly instantiated DSPs bool True    

Recommendation

Remove high fan-out nets driving DSP data inputs. Circuits with high fan-out nets driving DSP inputs will have both routability and timing closure difficulties.

Severity

Low

Tags

Tag Description
dsp Design rule checks related to DSP blocks inside the FPGA fabric.

Device Family

  • Intel Agilex®
  • Intel Agilex®
  • Intel®Stratix® 10