From c5bb7fb2304c5f4fa62b864185106aaf7c0c1b98 Mon Sep 17 00:00:00 2001
From: Greg Savin <43152568+SiFiveGregS@users.noreply.github.com>
Date: Fri, 13 Sep 2019 12:50:36 -0700
Subject: [PATCH] Add TCK padding in the OSCAN1 reset/online/activate sequence.
 (#406)

---
 src/jtag/drivers/ftdi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index 33b66b7e0..6fbcbce6c 100644
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -927,6 +927,20 @@ static void oscan1_reset_online_activate(void)
 	  /* TCK=0, TMS=1, TDI=0 (falling edge TCK with TMSC still 0) */
 	  {'0', '1', '0'},
 
+	  /* 3 TCK pulses for padding */
+	  /* TCK=1, TMS=1, TDI=0 (drive rising TCK edge) */
+	  {'1', '1', '0'},
+	  /* TCK=0, TMS=1, TDI=0 (drive falling TCK edge) */
+	  {'0', '1', '0'},
+	  /* TCK=1, TMS=1, TDI=0 (drive rising TCK edge) */
+	  {'1', '1', '0'},
+	  /* TCK=0, TMS=1, TDI=0 (drive falling TCK edge) */
+	  {'0', '1', '0'},
+	  /* TCK=1, TMS=1, TDI=0 (drive rising TCK edge) */
+	  {'1', '1', '0'},
+	  /* TCK=0, TMS=1, TDI=0 (drive falling TCK edge) */
+	  {'0', '1', '0'},
+
 	  /* Drive cJTAG escape sequence for SELECT */
 	  /* TCK=1, TMS=1, TDI=0 (rising edge of TCK with TMSC still 0, TAP reset that was just setup occurs here too) */
 	  {'1', '1', '0'},