CS4235 Datasheet, PDF (2/94 Pages) Cirrus Logic – CrystalClear Low Cost ISA Audio System

CRD4235-8
CrystalClear^TM 16-Bit Audio Motherboard Example Design
TABLE OF CONTENTS
CS4235 PERFORMANCE SPECIFICATIONS ... 3
GENERAL DESCRIPTION ................................. 12
ISA Bus Interface............................................. 13
PLUG AND PLAY ............................................... 15
PnP Data ......................................................... 16
Loading Resource Data................................... 16
Loading Firmware Patch Data......................... 18
The Crystal Key ............................................... 18
Bypassing Plug and Play................................. 19
Crystal Key 2 ................................................... 20
Hardware Configuration Data .......................... 20
Hostload Procedure ......................................... 24
External E²PROM............................................ 25
WINDOWS SOUND SYSTEM CODEC .............. 26
Enhanced Functions (MODEs)........................ 27
FIFOs ............................................................... 27
WSS Codec PIO Register Interface ................ 27
DMA Interface.................................................. 28
Sound System Codec Register Interface ........ 29
Direct Mapped Registers (R0-R3) ............... 30
I/O Data Registers (R3)............................... 31
Indirect Mapped Registers (I0-I31) .............. 32
WSS Extended Registers (X0-X31) ............ 44
SOUND BLASTER INTERFACE........................ 53
Mode Switching ............................................... 53
Sound Blaster Direct Register Interface.......... 53
Sound Blaster Mixer Registers........................ 54
GAME PORT INTERFACE ................................. 55
CONTROL INTERFACE ..................................... 57
Control Register Interface................................ 57
Control Indirect Registers (C0-C9) .................. 59
MPU-401 INTERFACE ........................................ 62
MPU-401 Register Interface ............................ 62
MIDI UART ...................................................... 63
MPU-401 "UART" Mode Operation ................. 63
FM SYNTHESIZER ............................................. 63
CDROM INTERFACE ......................................... 64
CS4610 DSP SERIAL DATA PORT .................. 64
CS9236 WAVETABLE SERIAL DATA PORT ... 66
WSS CODEC SOFTWARE DESCRIPTION .......67
Calibration ........................................................67
Changing Sampling Rate .................................68
Changing Audio Data Formats.........................69
Audio Data Formats .........................................69
DMA Registers .................................................69
WSS Codec Interrupt .......................................71
Error Conditions ...............................................71
DIGITAL HARDWARE DESCRIPTION...............72
Bus Interface ....................................................72
Volume Control Interface .................................72
Crystal/Clock ....................................................73
General Purpose Output Pins ..........................73
Reset and Power Down ...................................73
Address Port Configuration ..............................73
Multiplexed Pin Configuration ..........................74
ANALOG HARDWARE DESCRIPTION .............74
Line-Level Inputs Plus MPC Mixer...................74
Microphone Level Input....................................75
Mono Input .......................................................75
Line-Level Outputs ...........................................75
Miscellaneous Analog Signals .........................76
GROUNDING AND LAYOUT ..............................76
POWER SUPPLIES.............................................76
ADC/DAC FILTER RESPONSE..........................78
PIN DESCRIPTIONS ...........................................80
ISA Bus Interface Pins .....................................81
Analog Inputs ...................................................82
Analog Outputs.................................................83
MIDI Interface...................................................84
External Peripheral Signals..............................84
Joystick Interface..............................................85
CS4610 DSP Serial Port Interface...................85
CS9236 Wavetable Serial Port Interface .........85
CDROM Interface.............................................86
Volume Control.................................................87
Miscellaneous ...................................................87
Power Supplies ................................................88
PARAMETER DEFINITIONS...............................89
PACKAGE PARAMETERS .................................90
APPENDIX A: DEFAULT PnP DATA.................91
APPENDIX B: CS4235 DIFFERENCES .............93
Windows 95 and Windows 3.1 are trademarks; Microsoft, Windows and Windows Sound System are registered
trademarks of Microsoft Corporation.
Sound Blaster and Sound Blaster Pro are trademarks of Creative Labs.
Ad Lib is a trademark of Adlib Corporation.
CrystalClear is a trademark of Cirrus Logic, Inc.
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