AR #29170 - 11.3 System Generator for DSP - Why do I see simulation mismatches at the beginning of my HDL simulation generated from System Generator for DSP if Synplify is used for synthesis?

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11.3 System Generator for DSP - Why do I see simulation mismatches at the beginning of my HDL simulation generated from System Generator for DSP if Synplify is used for synthesis?

AR#	29170
Part	SW-SysGen
Last Modified	2009-09-10 00:00:00.0
Status	Active
Keywords	SysGen, not matching, mismatch, Synplify Pro, Behavioral simulation

Description

Keywords: SysGen, not matching, mismatch, Synplify Pro, Behavioral simulation

Why do I see simulation mismatches at the beginning of my HDL simulation generated from System Generator for DSP if Synplify is used for synthesis?

Solution

This can be caused by a known issue in which Synplify and Synplify Pro incorrectly optimize constants that drive shift register delay lines such that the delay is removed and the constant value is presented earlier than intended.