Added English language description for cdtbcd instruction

diff --git a/openpower/isa/bcd.mdwn b/openpower/isa/bcd.mdwn
index 3707692f55e146d493b451ad8987d9c5820f7832..81b96158ebb443abbb7dbd6b02b8d8cc96976b06 100644 (file)
--- a/openpower/isa/bcd.mdwn
+++ b/openpower/isa/bcd.mdwn
@@ -25,6 +25,14 @@ Pseudo-code:
       result[n+20:n+31] <- DPD_TO_BCD(src[n+22:n+31])
     RA <- result[64-XLEN:63]
 
+Description:
+
+    The low-order 20 bits of each word of register RS con-
+    tain two declets which are converted to six, 4-bit BCD
+    fields; each set of six, 4-bit BCD fields is placed into the
+    low-order 24 bits of the corresponding word in RA. The
+    high-order 8 bits in each word of RA are set to 0.
+
 Special Registers Altered:
 
     None