From 39348d09c3b71570d10251ed1124bc00539782a8 Mon Sep 17 00:00:00 2001
From: Staf Verhaegen <staf@stafverhaegen.be>
Date: Thu, 3 Oct 2019 16:47:47 +0200
Subject: [PATCH] cocotb/c4m_jtag: support trst_n to be None.

---
 sim/cocotb/c4m_jtag.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sim/cocotb/c4m_jtag.py b/sim/cocotb/c4m_jtag.py
index fe014f3..1dd13b1 100644
--- a/sim/cocotb/c4m_jtag.py
+++ b/sim/cocotb/c4m_jtag.py
@@ -44,7 +44,8 @@ class JTAG_Master(object):
         tdi <= 0
         self.tdo = tdo
         self.trst_n = trst_n
-        trst_n <= 1
+        if trst_n is not None:
+            trst_n <= 1
         self.period = Timer(clk_period)
 
         # Standard commands
-- 
2.30.2