AR# 40751

DSP48/A/A1/E/E1 Slice - Why am I seeing erratic behavior on the output?

Description

Why am I seeing erratic behavior on the output?

Solution

This can happen if the DSP Slice is not properly constrained.

It is recommend that users seeing such behavior should thoroughly examine their constraints of the data paths feeding the DSP48/A/A1/E/E1 Slice.

It is also recommended that the user review the constraints on the output path of theDSP48/A/A1/E/E1 Slice, though it is more likely to be the input causing corrupted data to be latched into the registers.

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AR# 40751
Date	12/15/2012
Status	Active
Type	General Article
Devices	Artix-7 Kintex-7 Spartan-3A DSP More Spartan-6 LX Spartan-6 LXT Virtex-4 FX Virtex-4 LX Virtex-4 QPro/R Virtex-4 SX Virtex-4Q Virtex-4QV Virtex-5 FXT Virtex-5 LX Virtex-5 LXT Virtex-5 SXT Virtex-5 TXT Virtex-5Q Virtex-5QV Virtex-6 CXT Virtex-6 HXT Virtex-6 LX Virtex-6 LXT Virtex-6 SXT Virtex-6Q Virtex-7 Virtex-7 HT Less

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AR# 40751

DSP48/A/A1/E/E1 Slice - Why am I seeing erratic behavior on the output?

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