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+################################################################################
+# Vivado (TM) v2020.2 (64-bit)
+#
+# README.txt: Please read the sections below to understand the steps required
+# to simulate the design for a simulator, the directory structure
+# and the generated exported files.
+#
+################################################################################
+
+1. Simulate Design
+
+To simulate design, cd to the simulator directory and execute the script.
+
+For example:-
+
+% cd questa
+% ./top.sh
+
+The export simulation flow requires the Xilinx pre-compiled simulation library
+components for the target simulator. These components are referred using the
+'-lib_map_path' switch. If this switch is specified, then the export simulation
+will automatically set this library path in the generated script and update,
+copy the simulator setup file(s) in the exported directory.
+
+If '-lib_map_path' is not specified, then the pre-compiled simulation library
+information will not be included in the exported scripts and that may cause
+simulation errors when running this script. Alternatively, you can provide the
+library information using this switch while executing the generated script.
+
+For example:-
+
+% ./top.sh -lib_map_path /design/questa/clibs
+
+Please refer to the generated script header 'Prerequisite' section for more details.
+
+2. Directory Structure
+
+By default, if the -directory switch is not specified, export_simulation will
+create the following directory structure:-
+
+<current_working_directory>/export_sim/<simulator>
+
+For example, if the current working directory is /tmp/test, export_simulation
+will create the following directory path:-
+
+/tmp/test/export_sim/questa
+
+If -directory switch is specified, export_simulation will create a simulator
+sub-directory under the specified directory path.
+
+For example, 'export_simulation -directory /tmp/test/my_test_area/func_sim'
+command will create the following directory:-
+
+/tmp/test/my_test_area/func_sim/questa
+
+By default, if -simulator is not specified, export_simulation will create a
+simulator sub-directory for each simulator and export the files for each simulator
+in this sub-directory respectively.
+
+IMPORTANT: Please note that the simulation library path must be specified manually
+in the generated script for the respective simulator. Please refer to the generated
+script header 'Prerequisite' section for more details.
+
+3. Exported script and files
+
+Export simulation will create the driver shell script, setup files and copy the
+design sources in the output directory path.
+
+By default, when the -script_name switch is not specified, export_simulation will
+create the following script name:-
+
+<simulation_top>.sh (Unix)
+When exporting the files for an IP using the -of_objects switch, export_simulation
+will create the following script name:-
+
+<ip-name>.sh (Unix)
+Export simulation will create the setup files for the target simulator specified
+with the -simulator switch.
+
+For example, if the target simulator is "ies", export_simulation will create the
+'cds.lib', 'hdl.var' and design library diectories and mappings in the 'cds.lib'
+file.
+