Verilog-2001 Quick Reference Guide - Sutherland …

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ByStuart verilog HDLQuick Reference Guidebased on the Verilog-2001 standard(IEEE Std 1364-2001)SutherlandHDLCopyright 2001, Sutherland HDL, Inc., all rights is granted by Sutherlaand HDL to download and/or printthe PDF document containing this Reference Guide for personal use only. The Reference guidemay not be used for commercial purposes or distributed in any form orby any means without obtaining express permission from HDLQuick Reference Guidebased on the Verilog-2001 standard(IEEE Std 1364-2001)byStuart Sutherlandpublished bySutherland HDL, SW 92nd PlaceTualatin, OR 97062 (503) 1992, 1996, 2001 by Sutherland HDL, Inc.

6 Verilog HDL Quick Reference Guide 4.8 Logic Values Verilog uses a 4 value logic system for modeling. There are two additional unknown logic values that may occur internal to the simulation, but which

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