Added English language description for cbsdtd instruction

diff --git a/openpower/isa/bcd.mdwn b/openpower/isa/bcd.mdwn
index 20e1fc2416df0608d8032c8c7949efe83291e0a4..0e9268398b7f8a9321e733d1ceee45aca92c8d2d 100644 (file)
--- a/openpower/isa/bcd.mdwn
+++ b/openpower/isa/bcd.mdwn
@@ -87,6 +87,17 @@ Pseudo-code:
       result[n+22:n+31] <- BCD_TO_DPD(src[n+20:n+31])
     RA <- result[64-XLEN:63]
 
+Description:
+
+    The low-order 24 bits of each word of register RS con-
+    tain six, 4-bit BCD fields which are converted to two
+    declets; each set of two declets is placed into the
+    low-order 20 bits of the corresponding word in RA. The
+    high-order 12 bits in each word of RA are set to 0.
+
+    If a 4-bit BCD field has a value greater than 9 the
+    results are undefined.
+
 Special Registers Altered:
 
     None