diff --git a/build/tools/AccessLogConverter/read_command_text.pl b/build/tools/AccessLogConverter/read_command_text.pl
index c2b832e..ca016a8 100755
--- a/build/tools/AccessLogConverter/read_command_text.pl
+++ b/build/tools/AccessLogConverter/read_command_text.pl
@@ -14,11 +14,22 @@ my $addr = 0;
 
 my $bkup = 0;
 
+my $line = 0;
+my $readcount = 0;
+
 while (<IN>) {
     my @data = split /\t/;
+    $line++;
     # pre-read
     if ( $step == 0 ) {
-        $step = 1  if ( $data[2] == 1 && $data[3] == 1 );
+        if ( $data[2] == 1 && $data[3] == 1 )
+        {
+            $step = 1;
+            if ( $bkup == 1 ) {
+                print "<<BACKUP ACCESS>>\n" ;
+                $bkup = 0;
+            }
+        }
         # backup access
         if ( $data[2] == 1 && $data[3] == 0 )
         {
@@ -27,10 +38,18 @@ while (<IN>) {
     }
     # read
     elsif ( $step == 1 ) {
-        if ( $data[4] =~ /B7/ ) {
+        if ( hex($data[4]) == 0xB7 ) {
             $step++;
             $addr = 0; # initialize
+            $readcount++;
+#            printf "READ COMMAND 0x%02x\n", hex($data[4]);
         } else {
+            if( hex($data[4]) != 0xB8 ) { # IDƒŠ�[ƒh
+                printf "<<INVALID :0x%02x>>\n", hex($data[4]);
+                printf "Read: 0x%08x-0x%08x (%6d bytes)\n", $start, $start+$size-1, $size if ($start);
+                $start = 0;
+                $size = 0;
+            }
             $step = 0; # restart
         }
     }
@@ -38,17 +57,22 @@ while (<IN>) {
     elsif ( $step == 2 || $step == 3 || $step == 4 || $step == 5 ) {
         $addr = $addr*256 + hex($data[4]);
         if ( $step == 5 ) {
-            if ( $start + $size == $addr && $bkup == 0 ) {
+            if ( $start + $size == $addr) {
                 $size += 512;
             } else {
                 printf "Read: 0x%08x-0x%08x (%6d bytes)\n", $start, $start+$size-1, $size if ($start);
                 $start = $addr;
                 $size = 512;
-                if ( $bkup == 1 ) {
-                    print "<<BACKUP ACCESS>>\n" ;
-                    $bkup = 0;
-                }
             }
+#            $step = 0; # restart
+        } else {
+#            $step++;
+        }
+        $step++;
+    }
+    # dummy access
+    elsif ( $step == 6 || $step == 7 || $step == 8) {
+        if ( $step == 8 ) {
             $step = 0; # restart
         } else {
             $step++;
@@ -59,7 +83,7 @@ close IN;
 
 if ($start) {
     printf "Read: 0x%08x-0x%08x (%6d bytes)\n", $start, $start+$size-1, $size
-} else {
+} elsif ($readcount == 0) {
     printf "Never read.\n";
 }
 if ( $bkup == 1 ) {