     7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0   7   6   5   4   3   2   1   0
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00 | Unused 0x00                   | Unused 0x00                   | Next index, 0xff=EOL          | Current index, 0xff=none      |
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04 | 12 unused bytes set to 0x00                                                                                                ...
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0c  ...                                                                                                                            |
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