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SAA7824 Datasheet(PDF) 23 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 23 Page - NXP Semiconductors |
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23 / 89 page  2003 Oct 01 23 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 7.11 EBU interface The bi-phase mark digital output signal at pin DOBM is in accordance with the format defined by the IEC 60958 specification. Three different modes can be selected via decoder register A: • DOBM pin held LOW • Data taken before concealment, mute and fade (must always be used for CD-ROM modes) • Data taken after concealment, mute and fade. An additional mute function is available via shadow register 7 (bank 1) and decoder register 0 and C. They provide the following: • Hard mute: immediate mute of the audio sample in the ROM mode at 1 ×, 2× or 4× • Soft mute: 3 ms ramp up or ramp down of the audio samples in the 1 × audio mode • Bypass: switches the EBU mute function out of the EBU signal path. 7.11.1 FORMAT The digital audio output consists of 32-bit words (‘subframes’) transmitted in bi-phase mark code (two transitions for a logic 1 and one transition for a logic 0). Words are transmitted in blocks of 384. The EBU frame format is given in Table 8. Table 8 EBU frame format; see also Table 9 Table 9 Description of EBU frame function FUNCTION BITS DESCRIPTION Sync 0 to 3 − Auxiliary 4 to 7 not used; normally zero Error flags 4 CFLG error and interpolation flags when selected by register A Audio sample 8 to 27 first 4 bits not used (always zero); twos complement; LSB = bit 12, MSB = bit 27 Validity flag 28 valid = logic 0 User data 29 used for subcode data (Q-to-W) Channel status 30 control bits and category code FUNCTION DESCRIPTION Sync The sync word is formed by violation of the bi-phase rule and therefore does not contain any data. Its length is equivalent to 4 data bits. The 3 different sync patterns indicate the following situations: sync B; start of a block (384 words), word contains left sample; sync M; word contains left sample (no block start) and sync W; word contains right sample. Audio sample Left and right samples are transmitted alternately. Validity flag Audio samples are flagged (bit 28 = 1) if an error has been detected but was uncorrectable. This flag remains the same even if data is taken after concealment. User data Subcode bits Q-to-W from the subcode section are transmitted via the user data bit. This data is asynchronous with the block rate. Channel status The channel status bit is the same for left and right words. Therefore a block of 384 words contains 192 channel status bits. The category code is always CD. The bit assignment is given in Table 10. |
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