AD1821 Analog Devices, AD1821 Datasheet - Page 2

• Manufacturer Part Number: AD1821
• Manufacturer: Analog Devices

AD1821
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PRODUCT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . 10
HOST INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SERIAL INTERFACES . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ISA INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
APPENDIX A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
APPENDIX B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . 44
AD1821 Chip Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 20
AD1821 Plug and Play Device Configuration Registers . . . 21
Sound System Direct Registers . . . . . . . . . . . . . . . . . . . . 22
Sound System Indirect Registers . . . . . . . . . . . . . . . . . . . 28
SB Pro; AdLib Registers . . . . . . . . . . . . . . . . . . . . . . . . . 37
MIDI and MPU-401 Registers . . . . . . . . . . . . . . . . . . . . . 38
Game Port Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
AD1821JS AND AD1821JS-M . . . . . . . . . . . . . . . . . . . . 39
AD1821JS PLUG AND PLAY INTERNAL ROM . . . . . 39
AD1821JS-M PLUG AND PLAY INTERNAL ROM . . 40
PLUG AND PLAY KEY AND “ALTERNATE KEY”
PROGRAMMING EXTERNAL EEPROMS . . . . . . . . . 42
REFERENCE DESIGNS AND DEVICE DRIVERS . . . 42
On/Off Hook Control
Call Progress Monitor
DTMF Detection and Generation
Auto Dial
Call Forwarding and Conferencing
VOX (Voice Detection)
ADPCM (32 kpbs Voice Compression)
Caller ID
Full-Duplex Speakerphone
Handset Record and Playback
Handset On/Off Detection
DSVD Software Upgradeable
Audio
Stereo Audio 16-Bit
V.34 Class Modem Analog Front End
Full-Duplex Capture and Playback Operation at
Internal 3D Circuit—Phat™* Stereo Phase Expander
Integrated OPL3-Compatible Music Synthesizer
Software and Hardware Volume Control
SEQUENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Different Sample Rates
Codec
TABLE OF CONTENTS
–2–
Figures
Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. PIO Read Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. PIO Write Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. DMA Read Cycle . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. DMA Write Cycle . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Codec Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6. DSP Port Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 7. I
Figure 8. Reset Pulse Width . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9. Serial Interface Right-Justified Mode . . . . . . . . . . 16
Figure 10. Serial Interface I
Figure 11. Serial Interface Left-Justified Mode . . . . . . . . . . 16
Figure 12. DSP Serial Interface (Default Frame Rate) . . . . 19
Figure 13. DSP Serial Interface (User Programmed
Figure 14. DSP Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 15. Codec Transfers . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 16. AD1821 Frequency Response Plots . . . . . . . . . . 43
Tables
Table I. DSP Port Time Slot Map . . . . . . . . . . . . . . . . . . . 17
Table II. Chip Register Diagram . . . . . . . . . . . . . . . . . . . . . 20
Table III. Logical Devices and Compatible Plug and
Table IV. Logical Device Configuration . . . . . . . . . . . . . . . 22
Table V. Sound System Direct Registers . . . . . . . . . . . . . . 22
Table VI. Codec Transfers . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table VII. Indirect Register Map and Reset/Default States . 29
Table VIII. Sound System Indirect Registers . . . . . . . . . . . 30
Table IX. SoundBlaster Pro ISA Bus Registers . . . . . . . . . . 37
Table X. AdLib ISA Bus Registers . . . . . . . . . . . . . . . . . . . 38
Table XI. MIDI ISA Bus Registers . . . . . . . . . . . . . . . . . . . 38
Table XII. Game Port ISA Bus Registers . . . . . . . . . . . . . . 38
PRODUCT OVERVIEW
The AD1821 MODIO™ (Modem over Audio) SoundComm
HSP (Host Signal Processing) Codec is a single-chip audio and
communications subsystem for personal computers. The
AD1821 solution includes the AD1821 mixed-signal controller
IC controller IC and MODIO™ host signal processing soft-
ware drivers. The AD1821 maintains full legacy compatibility
with applications written for SoundBlaster Pro and AdLib, while
servicing Microsoft PC 97 application requirements. The
AD1821 includes an internal OPL3 compatible music synthe-
sizer, Phat™ Stereo circuitry for phase expanding the analog
stereo output, an MPU-401 UART joystick interface with
built-in timer, a DSP serial port and two I
MODIO™ drivers utilize CPU resources to implement high
speed fax, data, voice (with Echo Cancellation) communications
and maintain audio compatibility. The drivers enable simulta-
neous execution of communications and audio with data flowing
through the AD1821, and provide a graceful degradation of mo-
dem performance as the host CPU load changes. The AD1821
on-chip Plug and Play routine provides configuration services
for all integrated logical devices.
Frame Rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Play Device Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2
S Serial Port Timing . . . . . . . . . . . . . . . . . . . . . . 7
2
S-Justified Mode . . . . . . . . . . . 16
2
S Serial ports. The
REV. 0
®