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diff --git a/openpower/sv/po9_encoding.mdwn b/openpower/sv/po9_encoding.mdwn
index 51d64c5464bb742ae3452e3909f9b03e1cd3f485..500ad33ab23653462049132970fec22abbaa8ce1 100644 (file)
--- a/openpower/sv/po9_encoding.mdwn
+++ b/openpower/sv/po9_encoding.mdwn
@@ -123,11 +123,15 @@ Encoding spaces and their potential are illustrated:
 
 Notes:
 
-* Prefixed-Prefixed (96-bit) instructions are prohibited. EXT1xx is
+* PO9-PO1 Prefixed-Prefixed (96-bit) instructions are prohibited. EXT1xx is
   thus inherently UnVectoriseable as the EXT1xx prefix is 32-bit
   on top of an SVP64 prefix which is 32-bit on top of a Defined Word
   and the complexity at the Decoder becomes too great for High
   Performance Multi-Issue systems.
+* PO1-PO9 Prefixed-Prefixed (96-bit) instructions are also prohibited
+  for the same reason: Multi-Issue Decode complexity is too great.
+* There is however no reason why PO1-PO9 (EXT109) as a 64-bit Encoding
+  should not be permitted as long as it is clearly marked as UnVectoriseable.
 * EXT100-163 instructions (PO1-Prefixed) are also prohibited from being
   double-PO1-prefixed (not twice prefixed)
 * RESERVED2 presently remains unallocated as of yet and therefore its