From 6e1ee40f48b2d53fb661ca4199485f3876ea390c Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 6 Apr 2019 03:43:11 +0100
Subject: [PATCH] d_valid need not be created if stage_ctl is set

---
 src/add/singlepipe.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/add/singlepipe.py b/src/add/singlepipe.py
index 0c198aa7..7f3abc21 100644
--- a/src/add/singlepipe.py
+++ b/src/add/singlepipe.py
@@ -223,7 +223,8 @@ class NextControl:
         self.o_valid = Signal(name="n_o_valid") # self out>>  next
         self.i_ready = Signal(name="n_i_ready") # self <<in   next
         self.o_data = None # XXX MUST BE ADDED BY USER
-        self.d_valid = Signal(reset=1) # INTERNAL (data valid)
+        if self.stage_ctl:
+            self.d_valid = Signal(reset=1) # INTERNAL (data valid)
 
     @property
     def i_ready_test(self):
-- 
2.30.2