From 156dbc1de71f81a6e5614dd2fc70d47ce3603e4a Mon Sep 17 00:00:00 2001
From: Marcel <marceljenke@gmail.com>
Date: Sun, 24 May 2020 03:22:13 +0200
Subject: [PATCH] data_io: prevent spurious wr signal with power-up-don't care

---
 common/Sound/sn76489/pll_mist.qip |  0
 common/mist/data_io.v             | 10 ++++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)
 delete mode 100644 common/Sound/sn76489/pll_mist.qip

diff --git a/common/Sound/sn76489/pll_mist.qip b/common/Sound/sn76489/pll_mist.qip
deleted file mode 100644
index e69de29b..00000000
diff --git a/common/mist/data_io.v b/common/mist/data_io.v
index dc641fad..aaf67786 100644
--- a/common/mist/data_io.v
+++ b/common/mist/data_io.v
@@ -156,21 +156,27 @@ end
 endgenerate
 
 always@(posedge clk_sys) begin : DATA_OUT
-	// bring flags from spi clock domain into core clock domain
+	// synchronisers
 	reg rclkD, rclkD2;
 	reg rclk2D, rclk2D2;
 	reg addr_resetD, addr_resetD2;
+
 	reg wr_int, wr_int_direct;
 	reg [24:0] addr;
 	reg [31:0] filepos;
 
+	// bring flags from spi clock domain into core clock domain
 	{ rclkD, rclkD2 } <= { rclk, rclkD };
 	{ rclk2D ,rclk2D2 } <= { rclk2, rclk2D };
 	{ addr_resetD, addr_resetD2 } <= { addr_reset, addr_resetD };
 
 	ioctl_wr <= 0;
 
-	if (!downloading_reg) ioctl_download <= 0;
+	if (!downloading_reg) begin
+		ioctl_download <= 0;
+		wr_int <= 0;
+		wr_int_direct <= 0;
+	end
 
 	if (~clkref_n) begin
 		wr_int <= 0;