Merge pull request #1769 from Icenowy/gw5a-pll-fix

clock/gowin_gw5a: change allowed frequency range for GW5A- prefix
enjoy-digital · Sep 6, 2023 · e1025c6 · e1025c6
2 parents e185871 + 7afe06a
commit e1025c6
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/litex/soc/cores/clock/gowin_gw5a.py b/litex/soc/cores/clock/gowin_gw5a.py
@@ -36,7 +36,9 @@ def __init__(self, devicename, device, vco_margin=0):
     @staticmethod
     def get_vco_freq_range(device):
         vco_freq_range = None
-        if device.startswith('GW5A-') or device.startswith('GW5AT-') or device.startswith('GW5AST-'):
+        if device.startswith('GW5A-'):
+            vco_freq_range = (800e6, 1600e6) # As restricted by Gowin toolchain 1.9.9b3
+        elif device.startswith('GW5A-') or device.startswith('GW5AT-') or device.startswith('GW5AST-'):
             vco_freq_range = (800e6, 2000e6) # datasheet values
         if vco_freq_range is None:
             raise ValueError(f"Unsupported device {device}.")
@@ -45,7 +47,9 @@ def get_vco_freq_range(device):
     @staticmethod
     def get_pfd_freq_range(device):
         pfd_freq_range = None
-        if device.startswith('GW5A-') or device.startswith('GW5AT-') or device.startswith('GW5AST-'):
+        if device.startswith('GW5A-'):
+            pfd_freq_range = (19e6, 400e6) # As restricted by Gowin toolchain 1.9.9b3
+        elif device.startswith('GW5AT-') or device.startswith('GW5AST-'):
             pfd_freq_range = (10e6, 400e6) # datasheet values
         if pfd_freq_range is None:
             raise ValueError(f"Unsupported device {device}.")