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WM9704CFT/V Datasheet(PDF) 14 Page - Wolfson Microelectronics plc |
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WM9704CFT/V Datasheet(HTML) 14 Page - Wolfson Microelectronics plc |
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14 / 37 page  WM9704M Production Data WOLFSON MICROELECTRONICS LTD PD Rev 3.2 January 2001 14 VARIABLE SAMPLE RATE SUPPORT The DACs and ADCs on this device support all the recommended sample rates specified in the Intel Rev 2.1 specification for both audio and modem rates. Default rates are 48ks/s. If alternative rates are selected, the AC’97 interface continues to run at 48k words per second, but data is transferred across the link in bursts such that the net sample rate selected is achieved. It is up to the AC’97 Rev 2.1 compliant controller to ensure that data is supplied to the AC link, and received from the AC link, at the appropriate rate. The device supports ‘on demand’ sampling. That is, when the DAC signal processing circuits need another sample, a sample request is sent to the controller which must respond with a data sample in the next frame it sends. For example, if a rate of 24ks/s is selected, on average the device will request a sample from the controller every other frame, for each of the stereo DACs. Note that if an unsupported rate is written to one of the rate registers, the rate will default to the nearest rate supported. The register will then respond when interrogated with the supported rate the device has defaulted to. ADCs are controlled similarly but with one difference: Normally the left and right channel ADCs sample at the same rate. AUDIO SAMPLE RATE CONTROL VALUE D15 TO D0 MODEM SAMPLE RATE CONTROL VALUE D15 TO D0 7200 1C20 8228.57 (57600/7) 2024 8000 1F40 8400 20D0 11025 2B11 9000 2328 16000 3E80 9600 2580 22050 5622 10285.71 (72000/7) 282D 44100 AC44 12000 2EE0 48000 BB80 13714.28 (96000/7) 3592 19200 4B00 24000 5DC0 Table 2 Variable Sample Rates Supported The following table shows which registers control which DAC rates, versus Mode and ID selected MODE ID FRONT DAC RATE REGISTER REAR DAC RATE REGISTER ADC RATE REG 00 and 01 2Ch 10 2Eh Rev 2.1 mode (00) 11 2Ch (centre) and 30h (LFE) 32h 00 and 01 2Ch 10 2Eh Modem mode (11) 11 2Ch (centre) and 30h (LFE) 40h 32h (40h if PHONE IP selected) Table 3 Variable Rate Register Location Versus Mode and ID GAIN CONTROL REGISTER LOCATION VERSUS MODE AND ID Depending on what mode and ID the device is operated in, the various gain control registers have locations in the register map that may change. In Modem mode, the rear volume is mapped always to location 46h, and the rear mixer is fixed muted so analogue sources cannot be summed into the Tx modem signal. |
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