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WM9705 Datasheet(PDF) 35 Page - Wolfson Microelectronics plc |
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WM9705 Datasheet(HTML) 35 Page - Wolfson Microelectronics plc |
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35 / 55 page  WM9705 Production Data w PD Rev 4.0 December 2003 35 DATA BIT FUNCTION VALUE VRA Variable rate audio support 1 DRA Double rate audio support 0 SPDIF SPDIF transmitter supported ‘1’ = supported VRM Variable rate Mic ADC support 0 DSA0 DAC slot mapping control See table below DSA1 DAC slot mapping control See table below CDAC Centre DAC support 0 SDAC Surround DAC support 0 LDAC LFE DAC support 0 AMAP Slot mapping support for Codec ID 1 REV0 Revision number 1 REV1 Revision number 0 ID0 Codec configuration – pin 45 value 0 (Inverse of level at pin 45) ID1 Codec configuration – fixed in WM9705 0 Table 16 Extended Audio ID Register DSA1, DSA0 DAC SLOT MAPPING 00 Slots 3 and 4 01 Slots 7 and 8 10 Slots 6 and 9 11 Slots 10 and 11 Table 17 DAC Slot Mapping DAC slot mapping to slots 7 and 8 or slots 6 and 9 cannot be used in variable rate mode (VRA=1) for sample rates other than 48kHz. REGISTER 2AH – EXTENDED AUDIO STATUS AND CONTROL REGISTER The Extended Audio Status and Control Register is a read/write register that provides status and control of the extended audio features. Note that SPDIF slot mapping default varies according to codec pin configuration. See Table 2. DATA BIT FUNCTION READ/WRITE VRA Enables variable rate audio mode Read/write SPDIF SPDIF transmitter enable Read/write SPSA0 SPDIF slot assignment Read/write SPSA1 SPDIF slot assignment Read/write SPCV SPDIF validity bit Read Table 18 Extended Audio Status and Control Register SPSA0, SPSA1 SPDIF SLOT MAPPING 00 Slots 3 and 4 01 Slots 7 and 8 10 Slots 6 and 9 11 Slots 10 and 11 Table 19 SPDIF Slot Mapping REGISTER 2Ch AND 32h – AUDIO SAMPLE RATE CONTROL REGISTERS These registers are read/write registers that are written to, to select alternative sample rates for the audio PCM converters. Default is the 48ks/s rate. Note that only Revision 2.2 recommended rates are supported by the WM9705, selection of any other unsupported rates will cause the rate to default to the nearest supported rate, and the supported rate value to be latched and so read |
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