From dc5bb9bbe89e75612fc2929a5b0f5b0a5b8c0cd1 Mon Sep 17 00:00:00 2001
From: Aaron Taylor <ataylor@subgeniuskitty.com>
Date: Thu, 31 Dec 2020 19:18:16 -0800
Subject: [PATCH] Added note explaining the format of register field
 definitions in pdp11_register.h.

---
 pdp11_register.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pdp11_register.h b/pdp11_register.h
index b5a8e79..1ea9881 100644
--- a/pdp11_register.h
+++ b/pdp11_register.h
@@ -166,6 +166,12 @@
  * =============================================================================
  */
 
+/*
+ * These take the form of a 'width' and 'offset'.  For example, if a field is 3
+ * bits wide, occupying bits 3-5 (starting from 0), then it would be defined as
+ * (07),(3).
+ */
+
 #define MMR0_AB_NONRES (01),(15)
 #define MMR0_AB_PAGLEN (01),(14)
 #define MMR0_AB_RO     (01),(13)
-- 
2.20.1