cores/clock: Add gowin_gw2a (Reusing GW1NPLL with specific vco/pfd_freq_ranges).

litex/soc/cores/clock/gowin_gw1n.py

@@ -1,7 +1,7 @@
 #
 # This file is part of LiteX.
 #
-# Copyright (c) 2021 Florent Kermarrec <florent@enjoy-digital.fr>
+# Copyright (c) 2021-2022 Florent Kermarrec <florent@enjoy-digital.fr>
 # SPDX-License-Identifier: BSD-2-Clause
 
 from migen import *
@@ -79,8 +79,6 @@ class GW1NPLL(Module):
             vco_freq_range = (400e6, 1200e6)
         elif device.startswith('GW1N-') or device.startswith('GW1NR-'):
             vco_freq_range = (400e6, 900e6)
-        elif device.startswith('GW2A-'):
-            vco_freq_range = (500e6, 1250e6) # datasheet values
         if vco_freq_range is None:
             raise ValueError(f"Unsupported device {device}.")
         return vco_freq_range
@@ -97,8 +95,6 @@ class GW1NPLL(Module):
             pfd_freq_range = (3e6, 400e6)  # not verified: not found in the datasheet
         elif device.startswith('GW1N-') or device.startswith('GW1NR-'):
             pfd_freq_range = (3e6, 400e6)  # not verified: not found in the datasheet
-        elif device.startswith('GW2A-'):
-            pfd_freq_range = (3e6, 500e6)  # datasheet values
         if pfd_freq_range is None:
             raise ValueError(f"Unsupported device {device}.")
         return pfd_freq_range

litex/soc/cores/clock/gowin_gw2a.py

@@ -0,0 +1,32 @@
+#
+# This file is part of LiteX.
+#
+# Copyright (c) 2022 Florent Kermarrec <florent@enjoy-digital.fr>
+# SPDX-License-Identifier: BSD-2-Clause
+
+from migen import *
+
+from litex.soc.cores.clock.gowin_gw1n import GW1NPLL
+
+# GoWin / GW2APLL ----------------------------------------------------------------------------------
+
+class GW2APLL(GW1NPLL):
+    # GW2A has the same PLL primitive than GW1N but vco/pfd_freq_range are specific to device.
+
+    @staticmethod
+    def get_vco_freq_range(device):
+        vco_freq_range = None
+        if device.startswith('GW2A-'):
+            vco_freq_range = (500e6, 1250e6) # datasheet values
+        if vco_freq_range is None:
+            raise ValueError(f"Unsupported device {device}.")
+        return vco_freq_range
+
+    @staticmethod
+    def get_pfd_freq_range(device):
+        pfd_freq_range = None
+        if device.startswith('GW2A-'):
+            pfd_freq_range = (3e6, 500e6)  # datasheet values
+        if pfd_freq_range is None:
+            raise ValueError(f"Unsupported device {device}.")
+        return pfd_freq_range