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CS4399 Datasheet(PDF) 51 Page - Cirrus Logic |
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CS4399 Datasheet(HTML) 51 Page - Cirrus Logic |
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51 / 111 page  DS1113F1 51 CS4399 5.8 Audio Output Power-Up Initialization 5.8 Audio Output Power-Up Initialization An example of the power-up initialization for PCM and DSD are shown in Ex. 5-3 and Ex. 5-4, respectively. Follow the stated sequence every time to initialize the audio output. 5.8.1 PCM Power-Up Initialization 11 Mute DSD Processor Path Signal Control 1. 0x70002 data(0x70002) OR (0x03) Reserved DSD_VOL_BEQA DSD_SZC Reserved DSD_AMUTE DSD_AMUTEBEQA DSD_MUTE_A DSD_MUTE_B x x x x x x 1 1 Mute channel A Mute channel B 12 Wait time delay. If DSD_SZC = 1, then delay = (255 - max(DSD_VOLUME_A, DSD_VOLUME_B)) / 2 ms. Else, delay = 130 ms. 13 Power down amplifier Power Down Control. 0x20000 data(0x20000) OR (0x10) PDN_XSP PDN_ASP PDN_DSDIF PDN_HP PDN_XTAL PDN_PLL PDN_CLKOUT Reserved x x x 1 x x x x Turn off DAC output 14 Wait for interrupt. Check for PDN_DONE_INT = 1 in Interrupt Status 1 register (0xF0000). 15 Reset data buffer 0x90097 0x01 16 Power down DSD/XSP/ ASP interfaces Power Down Control. 0x20000 data(0x20000) OR (0xE0) PDN_XSP PDN_ASP PDN_DSDIF PDN_HP PDN_XTAL PDN_PLL PDN_CLKOUT Reserved 1 1 1 x x x x x 17 Unmute DSD Processor Path Signal Control 1. 0x70002 data(0x70002) AND (0xFC) Reserved DSD_VOL_BEQA DSD_SZC Reserved DSD_AMUTE DSD_AMUTEBEQA DSD_MUTE_A DSD_MUTE_B 1 x x 0 x x 0 0 Unmute channel A Unmute channel B 18 Restore defaults 0xC0002 0x10 0xC000E 0x00 0xC0009 0x16 0x10010 0x00 Example 5-3. PCM Power-Up Initialization STEP TASK REGISTER/BIT FIELDS VALUE DESCRIPTION 1 PCM Power-Up Initialization 0x10010 0x99 0x10025 0x01 0x1002E 0x00 0xC0006 0x01 0xC0002 0x12 0xC0009 0x00 0xC0003 0x28 0xC0005 0x28 Example 5-2. DSD Power Down Sequence (Cont.) STEP TASK REGISTER/BIT FIELDS VALUE DESCRIPTION |
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