F1 -Frame

A group of 24 8-bit bytes, being the output of a scrambler and input to a CIRC encoder.

Each Scrambled Sector shall be mapped onto a series of consecutive frames. Each frame consists of 24 8-bit bytes, numbered from 0 to 23. Byte 0 of the Sector shall be placed in byte 4n of a frame, where n is 0, 1, 2, 3, 4 or 5. Consecutive bytes of the Sector are placed in consecutive bytes of the frames. Byte 2 351 of a Sector is immediately followed by byte 0 of the next Sector.

Subsequently, the byte order of each even-odd numbered pair of bytes in the frame is reversed. That is, the byte order 0, 1, 2, 3, 4, 5 is changed to 1, 0, 3, 2, 5, 4 .Such a frame with 24 interchanged 8-bit bytes is called an F1 -Frame. The position of byte 0 of a Sector in an F 1 -Frame is 4n + 1, where n is 0, 1, 2, 3, 4 or 5.

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