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SAA7824 Datasheet(PDF) 17 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 89 page  2003 Oct 01 17 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 W96 1Q R S TU V W 1Q 200/n µs min 11.3/n µs 11.3/n µs min 90/n µs max MBG401 Fig.10 Subcode format and timing on pin V4. Where n = disc speed. handbook, full pagewidth CRC flag D0 D1 D2 D3 D126 D127 CDTCLK CDTRDY CDTDATA MBL441 73/n µs to 317/n µs ~1/n ns 200 ns (min) Fig.11 CD text interface format and timing. Where n = disc speed. 7.8 FIFO and error correction The SAA7824 has a ±8 frame FIFO. The error corrector is a t = 2, e = 4 type, with error corrections on both C1 (32 symbol) and C2 (28 symbol) frames. Four symbols are used from each frame as parity symbols. This error corrector can correct up to two errors on the C1 level and up to four errors on the C2 level. The error corrector also contains a flag processor. Flags are assigned to symbols when the error corrector cannot ascertain if the symbols are definitely good. C1 generates output flags which are read after de-interleaving by C2, to help in the generation of C2 output flags. The C2 output flags are used by the interpolator for concealment of uncorrectable errors. They are also output via the EBU signal (DOBM). The EF output will flag bytes in error in both audio and CD-ROM modes. 7.8.1 FLAGS OUTPUT (CFLG) The flags output pin CFLG shows the status of the error corrector and interpolator and is updated every frame (7.35 × n kHz). In the SAA7824, 8 × 1-bit flags are present on the CFLG pin as illustrated in Fig.12. This signal shows the status of the error corrector and interpolator. The first flag bit, F1, is the absolute time sync signal, the FIFO-passed subcode sync and relates the position of the subcode sync to the audio data (DAC output). This flag may also be used in a super FIFO or in the synchronization of different players. The output flags can be made available at bit 4 of the EBU data format (LSB of the 24-bit data word), if selected by decoder register A. |
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