add comments

diff --git a/src/add/nmigen_add_experiment.py b/src/add/nmigen_add_experiment.py
index 495a0b4c3a539b95c306100b4b6da3d9ce0658ac..3689d61e0c69ffa2a0ad3e35eb9982da44074024 100644 (file)
--- a/src/add/nmigen_add_experiment.py
+++ b/src/add/nmigen_add_experiment.py
@@ -1892,7 +1892,11 @@ class FPADDMuxOutPipe(CombMuxOutPipe):
 class FPADDMuxInOut:
     """ Reservation-Station version of FPADD pipeline.
 
-        fan-in on
+        * fan-in on inputs (an array of FPADDBaseData: a,b,mid)
+        * 3-stage adder pipeline
+        * fan-out on outputs (an array of FPPackData: z,mid)
+
+        Fan-in and Fan-out are combinatorial.
     """
     def __init__(self, width, id_wid, num_rows):
         self.num_rows = num_rows