vendor.xilinx_{7series,ultrascale}: set BUFG* SIM_DEVICE as appropriate.

whitequark · whitequark · commit 438edf4112ef · 2020-08-26T10:18:02.000Z
Fixes #438 (again).
diff --git a/nmigen/vendor/xilinx_7series.py b/nmigen/vendor/xilinx_7series.py
@@ -317,10 +317,11 @@ def create_missing_domain(self, name):
                 ready = Signal()
                 m.submodules += Instance("STARTUPE2", o_EOS=ready)
                 m.domains += ClockDomain("sync", reset_less=self.default_rst is None)
-                # Actually use BUFGCTRL configured as BUFGCE, since using BUFGCE causes sim/synth
-                # mismatches with Vivado 2019.2, and the suggested workaround (SIM_DEVICE parameter)
-                # breaks Vivado 2017.4.
+                # Actually use BUFGCTRL configured as BUFGCE, since using BUFGCE causes
+                # sim/synth mismatches with Vivado 2019.2, and the suggested workaround
+                # (SIM_DEVICE parameter) breaks Vivado 2017.4.
                 m.submodules += Instance("BUFGCTRL",
+                    p_SIM_DEVICE="7SERIES",
                     i_I0=clk_i,   i_S0=C(1, 1), i_CE0=ready,   i_IGNORE0=C(0, 1),
                     i_I1=C(1, 1), i_S1=C(0, 1), i_CE1=C(0, 1), i_IGNORE1=C(1, 1),
                     o_O=ClockSignal("sync")
diff --git a/nmigen/vendor/xilinx_ultrascale.py b/nmigen/vendor/xilinx_ultrascale.py
@@ -168,12 +168,10 @@ def create_missing_domain(self, name):
             ready = Signal()
             m.submodules += Instance("STARTUPE3", o_EOS=ready)
             m.domains += ClockDomain("sync", reset_less=self.default_rst is None)
-            # Actually use BUFGCTRL configured as BUFGCE, since using BUFGCE causes sim/synth
-            # mismatches with Vivado 2019.2, and the suggested workaround (SIM_DEVICE parameter)
-            # breaks Vivado 2017.4.
-            m.submodules += Instance("BUFGCTRL",
-                i_I0=clk_i,   i_S0=C(1, 1), i_CE0=ready,   i_IGNORE0=C(0, 1),
-                i_I1=C(1, 1), i_S1=C(0, 1), i_CE1=C(0, 1), i_IGNORE1=C(1, 1),
+            m.submodules += Instance("BUFGCE",
+                p_SIM_DEVICE="ULTRASCALE",
+                i_CE=ready,
+                i_I=clk_i,
                 o_O=ClockSignal("sync")
             )
             if self.default_rst is not None:
