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这是我自己写的4位并转串ISE代码

# Reading D:/Software/ModelSim SE 6.1d/tcl/vsim/pref.tcl 
# //  ModelSim SE 6.1d Jan 23 2006 
# //
# //  Copyright 2006 Mentor Graphics Corporation
# //              All Rights Reserved.
# //
# //  THIS WORK CONTAINS TRADE SECRET AND 
# //  PROPRIETARY INFORMATION WHICH IS THE PROPERTY
# //  OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS
# //  AND IS SUBJECT TO LICENSE TERMS.
# //
# do pa_se_tst.fdo 
# ** Warning: (vlib-34) Library already exists at "work".
# Model Technology ModelSim SE vlog 6.1d Compiler 2006.01 Jan 23 2006
# -- Compiling module pa_se
# ** Error: pa_se.v(28): (vlog-2110) Illegal reference to net "out".
# ** Error: d:/software/modelsim se 6.1d/win32/vlog failed.
# Error in macro ./pa_se_tst.fdo line 5
# d:/software/modelsim se 6.1d/win32/vlog failed.
#     while executing
# "vlog  pa_se.v"