diff --git a/fpga/xilinx/programmer/bit2svf/commands.c b/fpga/xilinx/programmer/bit2svf/commands.c
index c4a9493..bddeec4 100644
--- a/fpga/xilinx/programmer/bit2svf/commands.c
+++ b/fpga/xilinx/programmer/bit2svf/commands.c
@@ -2,7 +2,8 @@
                                                                                 
   Copyright (c) 2005 Juan Pablo D. Borgna <jpborgna en inti gov ar>
   Copyright (c) 2006-2007 Salvador E. Tropea <salvador en inti gov ar>
-  Copyright (c) 2005-2007 Instituto Nacional de Tecnología Industrial
+  Copyright (c) 2005-2007 Instituto Nacional de Tecnolog�a Industrial
+  Copyright (c) 2012 Timothy Pearson <kb9vqf@pearsoncomputing.net>
   
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -276,6 +277,30 @@ do_command(char *cmd, FILE *dfp, FILE *ofp, int *col)
     }
  /* end SBITS command */
 
+ /* SADDBITS command */
+ if (strstr(cmd,"SADDBITS"))
+    {
+     /* get the args inside the () */
+     args_pos_s=strchr(cmd,'(');
+     args_pos_e=strchr(cmd,')');
+     if((!args_pos_s && args_pos_e )|| (!args_pos_e && args_pos_s))
+         {
+          fprintf(stderr,"Bad argument specification in $SADDBITS(VAL)$\n");
+          return 1;
+         }
+     if (!args_pos_s && !args_pos_e)
+       {
+          fprintf(stderr,"Bad argument specification in $SADDBITS(VAL)$\n");
+          return 1;
+       }
+     memcpy(args,args_pos_s+1,(size_t)(args_pos_e-args_pos_s)); /* Copy the argument */
+     args[args_pos_e-args_pos_s-1]='\0'; /* Put the null terminator */
+     value=value_from(args);
+     *col+=fprintf(ofp,"%d",(unsigned int)(s_bits+value));
+     return 0;
+    }
+ /* end SADDBITS command */
+
  /* SBYTES command */
  if (strstr(cmd,"SBYTES"))
     {
diff --git a/fpga/xilinx/programmer/bit2svf/templates/alg_Spartan_6.svft b/fpga/xilinx/programmer/bit2svf/templates/alg_Spartan_6.svft
index 5e64c24..b177a02 100644
--- a/fpga/xilinx/programmer/bit2svf/templates/alg_Spartan_6.svft
+++ b/fpga/xilinx/programmer/bit2svf/templates/alg_Spartan_6.svft
@@ -49,7 +49,7 @@ STATE RESET;
 SIR 6 TDI (05) ;
 SDR 32 TDI (00000000) SMASK (ffffffff) ;
 SIR 6 TDI (05) TDO (00) MASK (00) ;
-SDR $SBITS$ TDI ($DATA_INV(-1)$) SMASK ($FILL(0xFF,-1)$);
+SDR $SADDBITS(64)$ TDI ($DATA_INV(-1)$000000001000850c) SMASK ($FILL(0xFF,-1)$ffffffffffffffff) ;
 // Loading device with a `jstart` instruction. 
 SIR 6 TDI (0c) ;
 RUNTEST 24 TCK;