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CS4237B Datasheet(PDF) 79 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 79 Page - Cirrus Logic |
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79 / 114 page  For backwards compatibility with analog-mixed wavetable devices, I18 and I19 in the WSS logi- cal device can be remapped to control the volume of the Wavetable serial port. Remapping is controlled through the WTRMD bit in X4 reg- ister. When WTEN = 1, and WTRMD = 0, writes to I18 and I19 are remapped to X16 and X17 respectively. When remapping is enabled, the LINE analog input volume is controlled thr ough X0 /1. When WTRMD = 1, th e Wavetable Serial Port volume is only controlled through X16/17. WSS CODEC SOFTWARE DESCRIPTION The WSS Codec must be in Mode Change En- able Mode (MCE=1) before any changes to the Interface Configuration register (I9) or the Sam- ple Frequency (lower four bits) in the Fs & Playback Data Format registers (I8) are allowed. The actual audio data formats, which are the up- per four bits of I8 for playback and I28 for capture, can be changed by setting MCE (R0) or PMCE/CMCE (I16) high. The exceptions are CEN and PEN which can be changed "on-the- fly" via programmed I/O writes. All outstanding DMA transfers must be completed before new values of CEN or PEN are recognized. Calibration The WSS Codec has four different calibration modes. The selected calibration occurs whenever the Mode Change Enable (MCE, R0) bit goes form 1 to 0. The completion of calibration can be determined by polling the Auto-Calibrate In-Progress bit in the Error Status and Initialization register (ACI, I11). This bit will be high while the calibration is in progress and low once completed. Transfers enabled during calibration will not begin until the calibration cycle has completed. Since the part always operates at 44.1 kHz internally, all calibration times are based on 44.1 kHz sample periods. The Calibration procedure is as follows: 1) Place the WSS Codec in Mode Change Enable using the MCE bit of the Index Ad- dress register (R0). 2) Set the CAL1,0 bits in the Interface Configura- tion register (I9). 3) Return from Mode Change Enable by reset- ting the MCE bit of the Index Address register (R0). 4) Wait until 80h NOT returned 5) Wait until ACI (I11) cleared to proceed NO CALIBRATION (CAL1,0 = 00) This is the fastest mode since no calibration is performed. This mode is useful for games which require the sample frequency be changed quickly. This mode is also useful when the codec is operating full-duplex and an ADC data format change is desired. This is the only calibration mode that does not affect the DACs (i.e. mute the DACs). The No Calibration mode takes zero sample periods. BRESET SDATA LRCLK MCLK CS9236 MCLK5I LRCLK MIDI_IN SOUT XTAL3I PDN RST MIDOUT MIDIN Joystick Connector Midi Out Midi In 100 Ω 100k Ω 100k Ω Figure 13. CS9236 Wavetable Serial Port Interface DS213PP4 CS4237B 79 |
Similar Part No. - CS4237B |
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Similar Description - CS4237B |
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