From 8aa58b50600aea8091a3357e1c89e5894e228465 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Wed, 6 Dec 2017 16:49:00 -0800
Subject: Make explicit that 0xFFFF is an illegal opcode

---
 src/intro.tex | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/intro.tex')

diff --git a/src/intro.tex b/src/intro.tex
index c1d8023..5d7b2f1 100644
--- a/src/intro.tex
+++ b/src/intro.tex
@@ -344,7 +344,8 @@ Instruction lengths between 80 bits and 176 bits are encoded using a
 3-bit field in bits [14:12] giving the number of 16-bit words in
 addition to the first 5$\times$16-bit words.  The encoding with bits
 [14:12] set to {\tt 111} is reserved for future longer instruction
-encodings.
+encodings.  The encodings with bits [15:0] all zeros or all ones are
+illegal.
 
 \begin{figure}[hbt]
 {
-- 
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