Hi AnomalousMonk, Here is the quote from my req... "...the LSb of the output (Q[0] = D[0]) matches the LSb of the input. With the starting value established, the remaining 7bits of the output (9th bit always 1) is derived from sequential XORing of each bit of the input with the previously derived bit...." Therefore i coded it this way. In a very simple way. pls let me know if it is clear now. Also i was looking for some input to make my code smaller/smarter than it is now. 
my %map;

for my $i ( 0 .. 255 ) {
    my @Q = qw(0 0 0 0 0 0 0 0 0);
    my $result;
    #Step 1 : $Q[0] = D[0]
    $Q[0] = ($i & 0x01);

    #Step 2 : $Q[1] = D[1] ^ $Q[0]
    $Q[1] = (($i & 0x02) ^ ($Q[0] << 1));

    #Step 3 : $Q[2] = D[2] ^ $Q[1]
    $Q[2] = ($i & 0x04) ^ ($Q[1] << 1);

    #Step 4 : $Q[3] = D[3] ^ $Q[2]
    $Q[3] = ($i & 0x08) ^ ($Q[2] << 1);

    #Step 5 : $Q[4] = D[4] ^ $Q[3]
    $Q[4] = ($i & 0x10) ^ ($Q[3] << 1);

    #Step 6 : $Q[5] = D[5] ^ $Q[4]
    $Q[5] = ($i & 0x20) ^ ($Q[4] << 1);

    #Step 7 : $Q[6] = D[6] ^ $Q[5]
    $Q[6] = ($i & 0x40) ^ ($Q[5] << 1);

    #Step 8 : $Q[7] = D[7] ^ $Q[6]
    $Q[7] = ($i & 0x80) ^ ($Q[6] << 1);

    #Step 9 : $Q[8] = 1
    $Q[8] = 0x100;

    $result = ($Q[0] | $Q[1] | $Q[2] | $Q[3] | $Q[4] | $Q[5] | $Q[6] |
+ $Q[7] | $Q[8]);
    $map{ $i } = $result;
    #print "$result ";
}

pp \%map;

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In reply to Re^9: encoding hdmi video byte by hdmiguru
in thread encoding hdmi video byte by hdmiguru

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