don't emit write/read-buffer logic for external components

Author: darsor

src/peakrdl_regblock/read_buffering/implementation_generator.py

@@ -22,7 +22,7 @@ def enter_Reg(self, node: RegNode) -> None:
         super().enter_Reg(node)
         assert isinstance(node.inst, Reg)
 
-        if not node.get_property('buffer_reads'):
+        if not node.get_property('buffer_reads') or node.external:
             return
 
         context = {

src/peakrdl_regblock/read_buffering/storage_generator.py

@@ -11,7 +11,7 @@ def enter_Field(self, node: FieldNode) -> None:
     def enter_Reg(self, node: RegNode) -> None:
         super().enter_Reg(node)
 
-        if not node.get_property('buffer_reads'):
+        if not node.get_property('buffer_reads') or node.external:
             return
 
         regwidth = node.get_property('regwidth')

src/peakrdl_regblock/scan_design.py

@@ -95,8 +95,10 @@ def enter_Reg(self, node: 'RegNode') -> None:
         accesswidth = node.get_property('accesswidth')
         self.ds.cpuif_data_width = max(self.ds.cpuif_data_width, accesswidth)
 
-        self.ds.has_buffered_write_regs = self.ds.has_buffered_write_regs or bool(node.get_property('buffer_writes'))
-        self.ds.has_buffered_read_regs = self.ds.has_buffered_read_regs or bool(node.get_property('buffer_reads'))
+        if node.get_property('buffer_writes') and not node.external:
+            self.ds.has_buffered_write_regs = True
+        if node.get_property('buffer_reads') and not node.external:
+            self.ds.has_buffered_read_regs = True
 
     def enter_Signal(self, node: 'SignalNode') -> None:
         if node.get_property('field_reset'):

src/peakrdl_regblock/write_buffering/implementation_generator.py

@@ -23,7 +23,7 @@ def enter_Reg(self, node: 'RegNode') -> None:
         super().enter_Reg(node)
         assert isinstance(node.inst, Reg)
 
-        if not node.get_property('buffer_writes'):
+        if not node.get_property('buffer_writes') or node.external:
             return
 
         regwidth = node.get_property('regwidth')

src/peakrdl_regblock/write_buffering/storage_generator.py

@@ -19,7 +19,7 @@ def enter_Field(self, node: FieldNode) -> None:
     def enter_Reg(self, node: RegNode) -> None:
         super().enter_Reg(node)
 
-        if not node.get_property('buffer_writes'):
+        if not node.get_property('buffer_writes') or node.external:
             return
 
         regwidth = node.get_property('regwidth')