From 2ff542063018007be7a94ddf9b24cc25abec69e1 Mon Sep 17 00:00:00 2001
From: aholtzma <aholtzma@gmail.com>
Date: Wed, 28 Oct 2020 17:01:32 -0400
Subject: [PATCH] Update system_top.v

Add a comment that the spi CS decoding is tied to a setting in the device tree.
---
 projects/fmcomms8/zcu102/system_top.v | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/projects/fmcomms8/zcu102/system_top.v b/projects/fmcomms8/zcu102/system_top.v
index 93d9b0afb..6e64c0c30 100644
--- a/projects/fmcomms8/zcu102/system_top.v
+++ b/projects/fmcomms8/zcu102/system_top.v
@@ -158,8 +158,9 @@ module system_top (
   wire            spi_mosi;
   wire            spi0_miso;
 
+  // The csn bus from the SPI controller needs to be decoded as 
+  // is-decoded-cs = <1> is set in the device tree.
   reg  [7:0]     spi_3_to_8_csn;
-
   always @(*) begin
     case (spi_csn)
       3'h0: spi_3_to_8_csn = 8'b11111110;