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CS4237B Datasheet(PDF) 48 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 48 Page - Cirrus Logic |
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48 / 114 page  WSS EXTENDED REGISTERS The Windows Sound System codec contains three sets of registers: R0-R3, I0-I31, and X0- X25. R0-R3 are directly mapped to the ISA bus through WSSbase+0 through WSSbase+3 re- spectively. R0 and R1 provide access to the indirect registers I0-I31. The third set of registers are extended registers X0-X25 that are indirectly mapped through the WSS register I23. I23 acts as both the extended address and extended data register. These extended registers are only avail- able when in MODE 3. Accessing the X registers requires writing the register address to I23 with XRAE set. When XRAE is set, I23 changes from an address regis- ter to a data register. Subsequent accesses to I23 access the extended data register. To convert I23 back to the extended address register, R0 must be written which internally clears XRAE. As- suming the part is in MODE 3, the following steps access the X registers: 1. Write 17h to R0 (to access I23). R1 is now the extended address register. 2. Write the desired X register address to R1 with XRAE = 1. R1 is now the extended data register. 3. Write/Read X register data from R1. To read/write a different X register: 4. Write 17h to R0 again. (resets XRAE) R1 is now the extended address register. 5. Write the new X register address to R1 with XRAE = 1. R1 is now the new extended data register. 6. Read/Write new X register data from R1. Address Reg. Register Name WSSbase+0 R0 Reset Address WSSbase+1 R1 Address/Data access I23 Indexed Address/Data Extended Register Access (I23) D7 D6 D5 D4 D3 D2 D1 D0 XA3 XA2 XA1 XA0 XRAE XA4 res ACF Table 16. WSS Extended Register Control Index Register Name X0 Left LINE Alternate Volume X1 Right LINE Alternate Volume X2 Left MIC Volume X3 Right MIC Volume X4 Synthesis and Input Mixer Control X5 Right Input Mixer Control X6 Left FM Synthesis Volume X7 Right FM Synthesis Volume X8 Left DSP Serial Port Volume X9 Right DSP Serial Port Volume X10 Right Loopback Monitor Volume X11 DAC Mute and IFSE Enable X12 Independent ADC Sample Freq. X13 Independent DAC Sample Freq. X14 Left Master Digital Audio Volume X15 Right Master Digital Audio Volume X16 Left Wavetable Serial Port Volume X17 Right Wavetable Serial Port Volume X18-X24 Reserved X25 Chip Version and ID Table 17. WSS Extended Registers DS213PP4 CS4237B 48 |
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