Audio Interface Module (AIM)MCF5253 Reference Manual, Rev. 1Freescale Semiconductor 17-396, 7 ENCODE SWAP See note 1.Block encode swap control00 15 ENCODE SYNCENABLESee note 2.1 Outgoing sync detecting enabled0 Outgoing sync detecting disabled0 23 ENCODEENABLESee note 3.1 Scramble active0 Scrambling inactive0 31, 2 ENCODEMODE00 No CRC instructed01 Mode 110 Mode 2, form 111 Mode 2, form 200 4, 5Notes: 1. See Table 17-22 for definition of how the swap is done.2. Decode Sync Allow and Encode Sync Allow define whether the interfaces recognize the CD-ROM syncs embedded in theCD-ROM sectors. If this bit is switched on, then the interface will recognize the start of a new sector after finding the syncsequence in the data. If the bit is switched off, or if no sync sequence is found, sector start is assumed to be one sector length(2352 bytes) after the previous sector.3. CDROM descrambling/scrambling control if required.4. Mode selection determines how the CRC is calculated. The CRC depends on the CD-ROM mode/form, as defined in CDstandards.5. inserted CRC will over-write processor written data. (Processor sets CRC to any value, logic overwrites this.)Table 17-22. Swap Control in CD-ROM Encoder/DecoderSwap Field Swap Action11 Notation used is 32-bit words. Bits31-16 are part of the LEFT sample, bits 15-0 are part of the RIGHT sample.00 dataOut(31:0):= dataIn(31:0)01 dataOut(31:16):= dataIn(15:0)dataOut(15:0):= dataIn(31:16)10 dataOut(31:24):= dataIn(23:16)dataOut(23:16):= dataIn(31:24)dataOut(15:8):= dataIn(7:0)dataOut(7:0):= dataIn(15:8)11 dataOut(31:24):= dataIn(7:0)dataOut(23:16):= dataIn(15:8)dataOut(15:8):= dataIn(23:16)dataOut(7:0):= dataIn(31:24)Table 17-21. BlockControl Register Field Descriptions (continued)Bit Number Bit Name Description Reset Notes
