Add assertion for no replacements given unique inputs

rtio/sed/output_network.py

@@ -165,5 +165,22 @@ class OutputNetwork(Elaboratable):
                     # for i in range(len(self.input)):
                         # m.d.comb += Assert(appeared[i])
 
+            # If the valid bit / channel no. combinations of all input data are
+            # unique then there should be no replacements
+            with m.If(f_output_valid):
+                nodes_unique = Signal(reset=1)
+                for node1 in range(len(self.input)):
+                    for node2 in range(node1):
+                        k1 = Cat(Past(self.input[node1].payload.channel, clocks=network_latency), ~Past(self.input[node1].valid, clocks=network_latency))
+                        k2 = Cat(Past(self.input[node2].payload.channel, clocks=network_latency), ~Past(self.input[node2].valid, clocks=network_latency))
+                        with m.If(k1 == k2):
+                            m.d.comb += nodes_unique.eq(0)
+                with m.If(nodes_unique):
+                    replacement_occurred = Signal()
+                    for output_node in self.output:
+                        with m.If(output_node.replace_occured):
+                            m.d.comb += replacement_occurred.eq(1)
+                    m.d.comb += Assert(~replacement_occurred)
+
     def elaborate(self, platform):
         return self.m