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Update comment about the generation of the desync sequence.

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David Given
2022-03-19 18:41:03 +01:00
parent 39d6b0525f
commit fc7859dc27
1 changed files with 13 additions and 4 deletions
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13
arch/agat/decoder.cc
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@@ -19,9 +19,18 @@
* Each pattern is prefixed with this one:
*
* data: - - - X - - X - = 12
* flux: 10 10 10 01 00 10 01 00 = a924
* magic: 10 00 10 01 00 10 01 00 = 8924
* flux: (10) 10 10 10 01 00 10 01 00 = a924
* magic: (10) 10 00 10 01 00 10 01 00 = 8924
* ^
*
* This seems to be generated by emitting A4 in MFM and then a single 0 bit to
* shift it out of phase, so the data bits become clock bits and vice versa.
*
* X - X - - X - - = A4
* 0100010010010010 = MFM encoded
* 1000100100100100 = with trailing zero
* - - - X - - X - = effective bitstream
*
*/
static const uint64_t SECTOR_ID = 0x8924555549111444;