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diff --git a/zpu/hdl/example_ghdl/README b/zpu/hdl/example_ghdl/README new file mode 100644 index 0000000..a098c0c --- /dev/null +++ b/zpu/hdl/example_ghdl/README @@ -0,0 +1,44 @@ +This directory contains a quick setup of the helloworld example for
+the GHDL simulator.
+
+ http://ghdl.free.fr/
+
+Compiled by Arnim Laeuger, 17-Apr-2008.
+Removed ROC/unisim dependency 16-Jun-2008.
+
+Compiling the example
+---------------------
+
+Make all shell scripts executable:
+ $ chmod +x *.sh
+
+On Linux, convert files from DOS format:
+ $ dos2unix *.sh
+
+You need to import the project sources once by running
+ $ ./ghdl_import.sh
+
+Compilation (using GHDL's make feature) is invoked by
+ $ ./ghdl_make.sh
+
+Whenever the VHDL sources change, it's enough to execute ghdl_make.sh. GHDL
+will trace the dependencies and will rebuild only the modified sources.
+
+
+Simulation
+----------
+
+Simulation finally happens by running the fpga_top executable generated by the
+compilation step. Don't forget to set a stop time or the testbench might run
+forever:
+
+ $ ./fpga_top --stop-time=2100us
+
+The log.txt and trace.txt files are generated as simulation progresses. They
+should be compared to the files given in the example directory.
+
+Waveforms can be obtained by specifying the ghw file name:
+
+ $ ./fpga_top --stop-time=1ms --wave=zpu.ghw
+
+They can be inspected with gtkwave from http://home.nc.rr.com/gtkwave/.
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