targets/sayma_amc: add missin false paths on ethernet clocks

enjoy-digital · enjoy-digital · commit 2412271bc052 · 2017-10-16T10:09:22.000+02:00
diff --git a/misoc/targets/sayma_amc.py b/misoc/targets/sayma_amc.py
@@ -131,6 +131,13 @@ def __init__(self, *args, ethmac_nrxslots=2, ethmac_ntxslots=2, **kwargs):
 
         self.platform.add_platform_command("set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets eth_clocks_rx_IBUF_inst/O]")
 
+        self.ethphy.crg.cd_eth_tx.clk.attr.add("keep")
+        # period constraints are required here because of vivado
+        self.platform.add_period_constraint(self.ethphy.crg.cd_eth_tx.clk, 8.0)
+        self.platform.add_false_path_constraints(
+            self.crg.cd_sys.clk,
+            self.ethphy.crg.cd_eth_tx.clk, eth_clocks.rx)
+
 
 def main():
     parser = argparse.ArgumentParser(description="MiSoC port to the Sayma AMC")
