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[/] [scan_based_serial_communication/] [trunk/] [scan_signal_list.pl] - Blame information for rev 12

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# The list at the beginning defines the scan lists. Defining an input name or output
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#                                    name determines what type of scan signal it is.
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# This must be defined, whether or not it's used
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my $scan_reset_name = 'scan_reset';
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# Values are always readable (the buffering latch is what is read if writable)
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# Top of the list is first to come out of the scan chain
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my @signal_list = ( # Outputs - chip to outside
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                    { size =>   1, writable => 0, name => 'read_data_1'},
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                    { size =>   2, writable => 0, name => 'read_data_2'},
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                    { size =>   3, writable => 0, name => 'read_data_3'},
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                    { size =>  16, writable => 0, name => 'read_data_array',  addr_bits => 2, data_bits => 4},
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                    # Inputs - outside to chip
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                    { size =>   1, writable => 1, name => 'memory_load_mode'},
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                    { size =>   9, writable => 1, name => 'addr'},
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                    { size =>  64, writable => 1, name => 'input_data'},
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                    { size =>  64, writable => 0, name => 'output_data'},
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                    { size =>   1, writable => 1, name => 'w1_r0'},
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                    { size =>   1, writable => 1, name => 'write_data_1'},
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                    { size =>   2, writable => 1, name => 'write_data_2', reset => 3},
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                    { size =>   3, writable => 1, name => 'write_data_3'},
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                    { size =>  16, writable => 1, name => 'write_data_array', addr_bits => 2, data_bits => 4, reset => 0xAA55},
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                    # Scan Reset - Make first bit in chain to allow a quick reset if needed
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                    { size =>   1, writable => 1, name => $scan_reset_name},
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                    );
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# We're going to calculate the total scan chain length.
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# We also use this to set some key values and do some error checking, so do not comment out this section.
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my $scan_chain_length = 0;
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my $reset_exists      = 0;
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my $scan_reset_bit    = -1;
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for (my $i = 0; $i < scalar @signal_list; $i++) {
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    $signal_list[$i]{start} = $scan_chain_length;
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    # Check to see if we have a reset signal
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    if ($signal_list[$i]{name} eq $scan_reset_name) {
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        $scan_reset_exists = 1;
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        $scan_reset_bit    = $scan_chain_length;
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    }
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    # Here we set the default values for the addr_bits and data_bits fields
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    $signal_list[$i]{addr_bits} = 0 if (!exists $signal_list[$i]{addr_bits});
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    $signal_list[$i]{data_bits} = 0 if (!exists $signal_list[$i]{data_bits});
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    # It's an array if either of these values are set
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    if ($signal_list[$i]{addr_bits} == 0 && $signal_list[$i]{data_bits} == 0) {
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        # Default case is that nothing is set so we just add the size
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        $scan_chain_length += $signal_list[$i]{size};
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    } else {
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        # Let's do some error checking while we're at it:  2^addr_bits * data_bits >= size
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        if ((1 << $signal_list[$i]{addr_bits}) * $signal_list[$i]{data_bits} < $signal_list[$i]{size}) {
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            print STDERR "SCAN ERROR: addr_bits ($signal_list[$i]{addr_bits}) and data_bits ( $signal_list[$i]{data_bits})";
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            print STDERR " are not big enough to fit size ($signal_list[$i]{size}) for $signal_list[$i]{name}\n";
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            die;
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        }
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        # Passed the error checking, we're instead going to have address and data fields
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        $scan_chain_length += $signal_list[$i]{addr_bits};
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        $scan_chain_length += $signal_list[$i]{data_bits};
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    }
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}

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