From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Thu, 25 Apr 2013 11:11:15 +0000 (+0200)
Subject: graycounter: expose binary output
X-Git-Tag: 24jan2021_ls180~2099^2~603
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6c08cd67aaf42667115efba485adf61e7b27c3cf;p=litex.git

graycounter: expose binary output
---

diff --git a/examples/basic/graycounter.py b/examples/basic/graycounter.py
index bfc30f56..f623fbf7 100644
--- a/examples/basic/graycounter.py
+++ b/examples/basic/graycounter.py
@@ -11,8 +11,8 @@ class TB(Module):
 		self.prng = Random(7345)
 
 	def do_simulation(self, s):
-		print("{0:0{1}b} CE={2}".format(s.rd(self.gc.q),
-			self.width, s.rd(self.gc.ce)))
+		print("{0:0{1}b} CE={2} bin={3}".format(s.rd(self.gc.q),
+			self.width, s.rd(self.gc.ce), s.rd(self.gc.q_binary)))
 		s.wr(self.gc.ce, self.prng.getrandbits(1))
 
 sim = Simulator(TB())
diff --git a/migen/genlib/cdc.py b/migen/genlib/cdc.py
index 13612cfe..9569e013 100644
--- a/migen/genlib/cdc.py
+++ b/migen/genlib/cdc.py
@@ -78,20 +78,20 @@ class GrayCounter(Module):
 		self.ce = Signal()
 		self.q = Signal(width)
 		self.q_next = Signal(width)
+		self.q_binary = Signal(width)
+		self.q_next_binary = Signal(width)
 
 		###
 
-		q_binary = Signal(width)
-		q_next_binary = Signal(width)
 		self.comb += [
 			If(self.ce,
-				q_next_binary.eq(q_binary + 1)
+				self.q_next_binary.eq(self.q_binary + 1)
 			).Else(
-				q_next_binary.eq(q_binary)
+				self.q_next_binary.eq(self.q_binary)
 			),
-			self.q_next.eq(q_next_binary ^ q_next_binary[1:])
+			self.q_next.eq(self.q_next_binary ^ self.q_next_binary[1:])
 		]
 		self.sync += [
-			q_binary.eq(q_next_binary),
+			self.q_binary.eq(self.q_next_binary),
 			self.q.eq(self.q_next)
 		]