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SAA7824 Datasheet(PDF) 24 Page - NXP Semiconductors |
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SAA7824 Datasheet(HTML) 24 Page - NXP Semiconductors |
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24 / 89 page  2003 Oct 01 24 Philips Semiconductors Product specification CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control SAA7824 Table 10 Bit assignment FUNCTION BITS DESCRIPTION Control 0 to 3 copy of CRC checked Q-channel control bits 0 to 3; bit 2 is logic 1 when copy permitted; bit 3 is logic 1 when recording has pre-emphasis Reserved mode 4 to 7 always zero Category code 8 to 15 CD: bit 8 = logic 1, all other bits = logic 0 Clock accuracy 28 to 29 set by register A; 10 = level I; 00 = level II; 01 = level III Remaining 6 to 27 and 30 to 191 always zero 7.12 KILL features 7.12.1 THE KILL CIRCUIT The KILL circuit detects digital silence by testing for an all-zero or all-ones data word in the left and right channels. This occurs in two places; prior to the digital filter (internal KILL), and in the digital DAC (loopback/external KILL). Programming bit 3 of new shadow register A (bank 2) determines whether internal or external data is used. The output is switched to active HIGH when silence has been detected for at least 270 ms, or if mute is active, or in CD-ROM mode. Two KILL modes are available which can be selected by decoder register C: • Mono KILL: LKILL and RKILL are both active HIGH when silence is detected on left and right channels simultaneously • Stereo KILL: LKILL and RKILL are active HIGH independently of each other when silence is detected on either channel. 7.12.2 SILENCE INJECTION The silence inject function monitors the left and right KILL signals and forces the analog DAC into silence when KILL is asserted. This improves the internal Signal-to-Noise Ratio (SNR) by preventing any spurious noise from reaching the DAC. The silence inject function can be enabled or disabled by programming bit 2 of the new shadow register A (bank 2). 7.13 Audio features off The audio features can be turned off (selected by decoder register E) and will affect the following functions: • Digital filter, fade, peak detector, internal KILL circuit (although RKILL and LKILL outputs still active) are disabled • V5 (if selected to be the de-emphasis flag output) and the EBU outputs become undefined. The EBU output should be set LOW prior to switching the audio features off and after switching the audio features back on, a full-scale command should be given. 7.14 The versatile pins interface The SAA7824 has five pins that can be reconfigured for different applications. The functions of these versatile pins are identical to the SAA732x series and can be programmed by decoder registers C, D and shadow register 3 (bank 1) as shown in Table 11. |
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