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PCM1795 Datasheet(PDF) 27 Page - Texas Instruments |
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PCM1795 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 58 page  MODE CONTROL REGISTERS User-Programmable Mode Controls PCM1795 www.ti.com ........................................................................................................................................................................................................ SLES248 – MAY 2009 The PCM1795 includes a number of user-programmable functions that are accessed via mode control registers. The registers are programmed using the serial control interface, as previously discussed in the SPI Interface and I2C Interface sections. Table 8 lists the available mode-control functions, along with the default reset conditions and associated register index. Table 8. User-Programmable Function Controls DF FUNCTION DEFAULT REGISTER BIT PCM DSD BYPASS Digital attenuation control Register 16 ATL[7:0] (for left channel) 0 dB Yes No No 0 dB to –120 dB and mute, 0.5-dB step Register 17 ATR[7:0] (for right channel) Attenuation load control Attenuation disabled Register 18 ATLD Yes No No Disabled, enabled Input audio data format selection 16-, 20-, 32-bit standard (right-justified) Register 18 FMT[2:0] Yes No Yes 24-bit I2S format format 24-bit MSB-first left-justified format 16-/32-bit I2S format Sampling rate selection for de-emphasis De-emphasis disabled Register 18 DMF[1:0] Yes Yes(1) No Disabled, 44.1 kHz, 48 kHz, 32 kHz De-emphasis control De-emphasis disabled Register 18 DME Yes No No Disabled, enabled Soft mute control Mute disabled Register 18 MUTE Yes No No Soft mute disabled, enabled Output phase reversal Normal Register 19 REV Yes Yes Yes Normal, reverse Attenuation speed selection ×1 fS Register 19 ATS[1:0] Yes No No ×1fS, ×(1/2)fS, ×(1/4)fS, ×(1/8)fS DAC operation control DAC operation enabled Register 19 OPE Yes Yes Yes Enabled, disabled Stereo DF bypass mode select Monaural Register 19 DFMS Yes No Yes Monaural, stereo Digital filter roll-off selection Sharp roll-off Register 19 FLT Yes No No Sharp roll-off, slow roll-off Infinite zero mute control Disabled Register 19 INZD Yes No Yes Disabled, enabled System reset control Normal operation Register 20 SRST Yes Yes Yes Reset operation, normal operation DSD interface mode control Disabled Register 20 DSD Yes Yes No DSD enabled, disabled Digital-filter bypass control DF enabled Register 20 DFTH Yes No Yes DF enabled, DF bypass Monaural mode selection Stereo Register 20 MONO Yes Yes Yes Stereo, monaural Channel selection for monaural mode data Left channel Register 20 CHSL Yes Yes Yes Left channel, Right channel ΔΣ oversampling rate selection ×64 fS Register 20 OS[1:0] Yes Yes(2) Yes ×64 fS, ×128 fS, ×32 fS PCM zero output enable Enabled Register 21 PCMZ Yes No Yes DSD zero output enable Disabled Register 21 DZ[1:0] Yes Yes No (1) When in DSD mode, DMF[1:0] is defined as DSD filter (analog FIR) performance selection. (2) When in DSD mode, OS[1:0] is defined as DSD filter (analog FIR) operating rate selection. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 27 Product Folder Link(s): PCM1795 |
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