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CS4237B Datasheet(PDF) 78 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 78 Page - Cirrus Logic |
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78 / 114 page  The third serial format - SPF2, shown in Fig- ure 11, is called 32-bit mode. This format has 32 SCLKs per frame and FSYNC is high for the left channel and low for the right channel. The absolute time is similar to the other two modes but SCLK is stopped after the right channel is finished. SCLK is held stopped until the start of the next frame (stopped for 32 bit period times). This mode is useful for DSPs that do not want the interrupt overhead of the 32 unused bit peri- ods. As an example, if a DSP serial word length is 16 bits, then four interrupts will occur in SPF0 and SPF1 modes. In mode SPF2 the DSP will only be interrupted twice. The fourth serial format - SPF3, shown in Fig- ure 12, is called ADC/DAC mode. This format has 64 SCLKs per frame, with FSYNC high transitions at the start of the left ADC data word and low transitions at the start of the right ADC data word. For serial data in, SDIN, both the left and right 16-bit DAC data word should be fol- lowed by zeros. For serial data out, SDOUT, both the left and right ADC data words are fol- lowed by 16 bits of the DAC data words. The DAC data words are tapped off the data stream right before the data enters the Codec DACs (af- ter all digital summing is done). Having the ADC and DAC data on the SDOUT allows ex- ternal modem DSPs to cancel the local audio source from the local microphone signal. CS9236 WAVETABLE SERIAL PORT A digital interface to the Crystal CS9236 Single- Chip Wavetable Music Synthesizer is provided that allows the CS9236 PCM audio data to be summed digitally into the output digital mixer. The Wavetable Serial port pins are multiplexed with the XD7-XD5 external bus pins; therefore, when this serial interface is enabled, any external peripheral (CDROM, modem, etc.) will need an external buffer to the ISA bus. This serial port is enabled via the WTEN bit located in Control register C8 or in the Global Configuration byte in the Hardware Configuration data. The hard- ware connections to the CS9236 are illustrated in Figure 13. Volume control for the serial port is supported through X16 and X17 in the WSS extended reg- ister space. The volume range is +12 dB to -82.5 dB with 001000 equal to 0 dB. After vol- ume is applied to the PCM data, it is summed into the digital mixer which is then summed into the analog output mixer. FSYNC Left Data SCLK SDOUT 15 Right Data ADC 16 Clocks DAC 16 Clocks ADC 16 Clocks DAC 16 Clocks SDIN ... ... 15 14 13 ... 0 15 14 13 ... 0 15 14 13 ... 0 15 14 13 ... 0 15 14 13 ... 0 15 14 13 ... 0 DAC 16 Clocks DAC 16 Clocks 15 Figure 12. ADC/DAC Mode (SF1,0 = 11) DS213PP4 CS4237B 78 |
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