Simon Bjurek
--- a/b_asic/scheduler.py
+++ b/b_asic/scheduler.py
        log.debug("Scheduler initializing")
        self._initialize_scheduler(schedule)

-        if self._sfg.loops and self._schedule.cyclic:
+        if self._schedule.cyclic and self._sfg.loops:
--- a/test/unit/test_list_schedulers.py
+++ b/test/unit/test_list_schedulers.py
+            memories.append(memory)
+            memory.assign("graph_color")
+
+        arch = Architecture(
+            processing_elements,
+            memories,
+            direct_interconnects=direct,
+        )
+        assert len(arch.processing_elements) == 4
+        assert len(arch.memories) == 2
+
+    def test_execution_time_not_one_and_latency_offsets_port_constrained(self):
+        sfg = radix_2_dif_fft(points=16)
+
+        sfg.set_latency_offsets_of_type(
+            Butterfly, {"in0": 0, "in1": 1, "out0": 1, "out1": 2}
-            Butterfly, {"in0": 0, "in1": 1, "out0": 1, "out1": 2}
+            Butterfly, {"in0": 0, "in1": 1, "out0": 2, "out1": 3}
--- a/b_asic/scheduler.py
+++ b/b_asic/scheduler.py

    def _update_port_reads(self, next_op: "Operation") -> None:
        for input_port in next_op.inputs:
-            source_op = input_port.signals[0].source.operation
+            source_port = input_port.signals[0].source
+            source_op = source_port.operation
+            time = self._current_time + input_port.latency_offset
            if (
                not isinstance(source_op, DontCare)
                and not isinstance(source_op, Delay)
-                and not isinstance(source_op, Delay)
+                and not isinstance(source_op, (DontCare, Delay))