From ea6414f401cab6a8075d646bd3bbb4d10eb58259 Mon Sep 17 00:00:00 2001
From: Robin Clark <robin48gx@gmail.com>
Date: Mon, 7 Feb 2011 20:49:14 +0000
Subject: [PATCH] sw model notes

---
 sw_model/sw_model.tex | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sw_model/sw_model.tex b/sw_model/sw_model.tex
index 674b512..7315210 100644
--- a/sw_model/sw_model.tex
+++ b/sw_model/sw_model.tex
@@ -290,6 +290,14 @@ have at least the following functional modiules intgrated into it:
 \item digital I/O. 
 \end{itemize}
 
+Need to consider the failure modes of all these components.
+
+For ADC we also need to consider the MUX and how it interfaces with general I/O 
+pins.
+
+this later makes the example where we test the ADC and the MUX by
+forcing logical values onto the I/O pins the ADC reads.
+
 
 %% Super bbc micro all on one 28 pin chip