path: root/backends/autotest
diff options
Diffstat (limited to 'backends/autotest')
1 files changed, 23 insertions, 1 deletions
diff --git a/backends/autotest/ b/backends/autotest/
index 36d5650f..f9c6d364 100644
--- a/backends/autotest/
+++ b/backends/autotest/
@@ -298,7 +298,29 @@ static void autotest(FILE *f, RTLIL::Design *design)
struct AutotestBackend : public Backend {
- AutotestBackend() : Backend("autotest") { }
+ AutotestBackend() : Backend("autotest", "generate simple test benches") { }
+ virtual void help()
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" write_autotest [filename]\n");
+ log("\n");
+ log("Automatically create primitive verilog test benches for all modules in the\n");
+ log("design. The generated testbenches toggle the input pins of the module in\n");
+ log("a semi-random manner and dumps the resulting output signals.\n");
+ log("\n");
+ log("This can be used to check the synthesis results for simple circuits by\n");
+ log("comparing the testbench output for the input files and the synthesis results.\n");
+ log("\n");
+ log("The backend automatically detects clock signals. Additionally a signal can\n");
+ log("be forced to be interpreted as clock signal by setting the attribute\n");
+ log("'gentb_clock' on the signal.\n");
+ log("\n");
+ log("The attribute 'gentb_constant' can be used to force a signal to a constant\n");
+ log("value after initialization. This can e.g. be used to force a reset signal\n");
+ log("low in order to explore more inner states in a state machine.\n");
+ log("\n");
+ }
virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
log_header("Executing AUTOTEST backend (auto-generate pseudo-random test benches).\n");