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CS4237B Datasheet(PDF) 57 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 57 Page - Cirrus Logic |
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57 / 114 page  SOUND BLASTER INTERFACE The Sound Blaster Pro compatible interface is the third physical device in logical device 0. Since the WSS Codec and the Sound Blaster are mutually exclusive, the WSS Codec interrupt and playback DMA channel are shared with the Sound Blaster interface. To map volume controls properly, the external devices: synthesizer (when used), CDROM, etc., must be connected to the proper analog inputs as illustrated in Figure 5. Mode Switching To facilitate switching between different func- tional modes (i.e. Sound Blaster and Windows Sound System), logic is included to handle the switch transparently to the host. No special soft- ware is required on the host side to perform the mode switch. Sound Blaster Direct Register Interface The Sound Blaster software interface utilizes 10- bit address decoding and is compatible with Sound Blaster and Sound Blaster Pro interfaces. 10-bit addressing requires that the upper address bits be 0 to decode a valid address, i.e. no alias- ing occurs. This device requires 16 I/O locations located at the PnP address ’SBbase’. The follow- ing registers, shown in Table 19, are provided for Sound Blaster compatibility. Left/Right FM Registers, SBbase+0 - SBbase+3 These registers are mapped directly to the appro- priate FM synthesizer registers. Mixer Address Register, SBbase+4, write only This register is used to specify the index address for the mixer. This register must be written be- fore any data is accessed from the mixer registers. The mixer indirect register map is shown in Table 20. Address Description Type SBbase+0 Left FM Status Port Read SBbase+0 Left FM Register Status Port Write SBbase+1 Left FM Data Port Write Only SBbase+2 Right FM Status Port Read SBbase+2 Right FM Register Status Port Write SBbase+3 Right FM Status Port Write Only SBbase+4 Mixer Register Address Write Only SBbase+5 Mixer Data Port Read/Write SBbase+6 Reset Write Only SBbase+8 FM Status Port Read Only SBbase+8 FM Register port Write SBbase+9 FM Data Port Write Only SBbase+A Read Data Port Read Only SBbase+C Command/Write Data Write SBbase+C Write Buffer Status (Bit 7) Read SBbase+E Data Available Status (Bit 7) Read Table 19. Sound Blaster Pro Compatible I/O Interface DS213PP4 CS4237B 57 |
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