ESS Technology, Inc.
DESCRIPTION
The ES1938 PCI
AudioDrive®
solution implements a single-chip
PCI audio solution, providing high-quality audio processing while
maintaining full legacy DOS game compatibility. With a dynamic
range over 80 dB, the ES1938 complies with the Microsoft® PC
98 / PC 99 specifications and meets WHQL audio requirements.
The ES1938 forms a complete audio subsystem on a single chip
for motherboard platforms.
The ES1938 incorporates a microcontroller,
ESFM
TM
music
synthesizer, 16-bit stereo wave ADC and DAC, 16-bit stereo
music DAC, MPU-401 UART mode serial port, dual game port,
hardware master volume control, a serial port interface to
external wavetable music synthesizer, DMA control logic with
FIFO, and PCI bus interface logic. There are three stereo inputs
(typically, line-in, CD audio, and auxiliary line) and a mono
microphone input.
The ES1938 provides a serial EEPROM interface for ease of
programming the Subsystem ID and Subsystem Vendor ID.
The ES1938 integrates the ESS Technology field-proven
hardware design for DOS game compatibility with hardware FM
synthesis (ESFM synthesis) and three methods for legacy audio
control interface: PC/PCI, Distributed DMA, and Transparent
DMA. Transparent DMA requires no sideband signals from PC
core logic chipsets in addition to the standard PCI 2.2 bus.
Transparent DMA (TDMA) is compatible with the
Intel®Pentium®, Pentium II®, and Celeron™ chipsets, as well
as standard PCI add-in cards.
The ES1938 can record, compress, and play back voice, sound,
and music with built-in mixer controls. It supports stereo
full-duplex operation for simultaneous record and playback. The
ESFM
synthesizer has extended capabilities within native mode
operation providing superior sound and power-down capabilities.
The ES1938 also incorporates
Spatializer®
VBX™ technology,
provided by Desper Products, Inc., a subsidiary of Spatializer
Audio Laboratories, Inc. This processor expands the stereo
sound field emitted by two speakers to create a resonant 3D
sound environment.
The ES1938 is compliant with Advanced Power Management
(APM) 1.2, Advanced Configuration and Power Interface (ACPI)
1.0, and PCI Power Management Interface (PPMI) 1.0.
It is available in an industry-standard 100-pin low-profile quad flat
pack (LQFP) package.
ES1938
PCI
AudioDrive
®
Solution
Product Brief
FEATURES
•
Single, high-performance, mixed-signal, 16-bit stereo VLSI chip
•
PCI parallel bus interface, revision 2.2
•
Full native DOS games compatibility, via three technologies:
–– TDMA
–– DDMA
–– PC/PCI
High-quality
ESFM
music synthesizer
•
•
Dynamic range (SNR) over 80 dB
•
Integrated
Spatializer
3D VBX stereo audio effects processor
provided by Desper Products, Inc., a subsidiary of Spatializer
Audio Laboratories, Inc.
Record and Playback Features
•
Record, compress, and play back voice, sound, and music
•
16-bit stereo ADC and DAC
•
Programmable independent sample rates from 6 kHz up to
48 kHz for record and playback
•
Full-duplex operation for simultaneous record and playback
•
2-wire hardware volume control for up, down, and mute
Inputs and Outputs
•
Stereo inputs for line-in, auxiliary A (CD audio), and auxiliary B,
and a mono input for microphone
•
MPU-401 (UART mode) interface for wavetable synthesizers
and MIDI devices
•
Integrated dual game port
•
Separate mono input (MONO_IN) and mono output
(MONO_OUT) for speakerphone
Mixer Features
•
7-channel mixer with stereo inputs for line, CD audio, auxiliary
line, music synthesizer, digital audio (wave files), and mono
inputs for microphone and speakerphone
•
Programmable 6-bit logarithmic master volume control
Power
•
Advanced power management meets APM 1.2, ACPI 1.0, and
PPMI 1.0 standards
Compatibility
•
Supports PC games and applications for SoundBlaster
TM
and
SoundBlaster Pro
TM
•
Meets PC 98 / PC 99 and WHQL specifications
ESS Technology, Inc.
SAM0290-030601
1
ES1938 PRODUCT BRIEF
ES1938 PIN DESCRIPTIONS
Table 1 lists the ES1938 pin descriptions.
Table 1 ES1938 Pin Descriptions
Names
VDDD
AD[31:0]
Pin Numbers
1, 17, 64, 80
2:7, 9:16,
69:76, 79,
82:88, 98:99
8, 77, 89, 97
18
19
20
21
22
23
24, 52, 81,
100
25
26
30:27
31:34
35, 36
37, 38
39
40
41
42
43
44, 45
46, 47
48, 49
50, 51
I/O
I
I/O
Digital supply voltage (5V±5%).
Address and data lines from the PCI bus.
Descriptions
CBE[3:0]B
XO
XI
VOLDN
VOLUP
MCLK
MSD
GNDD
MONO_OUT
MONO_IN
T(A-D)
SW(A-D)
AUXB_L,
AUXB_R
AUXA_L,
AUXA_R
CMR
MIC
GNDA
CAP3D
VDDA
FOUT_R,
FOUT_L
CIN_L, CIN_R
LINE_L, LINE_R
AOUT_L,
AOUT_R
I/O
O
I
I
I
I
I
I
O
I
I/O
I
I
I
O
I
I
I
I
O
I
I
O
PCI command/byte enable.
Oscillator output. Connect to external 14.318-MHz crystal.
Oscillator/external clock input. Connect to external 14.318-MHz crystal or clock source
(must be CMOS levels).
Active-low volume decrease button input with internal pull-up.
Active-low volume increase button input with internal pull-up.
Input with internal pull-down. Music serial clock from external wavetable music synthesizer.
Input with internal pull-down. Music serial data from external wavetable music synthesizer.
Digital ground.
Mono output with source select and volume control (including mute). This pin can drive an
external 5k AC load.
Mono input to mixer and ADC. This pin has an internal pull-up to CMR.
Joystick timer. These pins connect to the X-Y positioning variable resistors for the two
joysticks.
Active-low joystick switch setting inputs. These SW pins have an internal pull-up resistor.
Auxiliary B inputs, left and right. AUXB_L and AUXB_R have internal pull-up resistors to
CMR.
Auxiliary A inputs, left and right. AUXA_L and AUXA_R have internal pull-up resistors to
CMR. Normally intended for connection to an internal or external CD-ROM analog output.
Common mode reference voltage (2.25V±5%). Bypass this pin to analog ground with
47-µF electrolytic in parallel with a 0.1-µF capacitor.
Microphone input. MIC has an internal pull-up resistor to CMR.
Analog ground.
Bypass capacitor to analog ground for 3D effects.
Analog supply voltage (5V±5%). Must be greater than or equal to VDDD –0.3V.
Filter outputs, left and right. AC-coupled externally to CIN_L and CIN_R to remove DC
offsets.
ADC and first channel DAC mixer inputs. These pins have internal 50k pull-up resistors to
CMR.
Line inputs, left and right. LINE_L and LINE_R have internal pull-up resistors to CMR.
Line-level stereo outputs, left and right. These pins can drive a 5k ohm AC load.
ESS Technology, Inc.
SAM0290-030601
3
ES1938 PRODUCT BRIEF
Table 1 ES1938 Pin Descriptions (Continued)
Names
PCSPKO
PCSPKI
MSO
MSI
SIRQ
NC
INTAB
PCPCIREQB
PCPCIGNTB
CLKRUNB
PRSTB
PCLK
GNTB
REQB
IDSEL
FRAMEB
IRDYB
TRDYB
DEVSELB
STOPB
LOCKB
PAR
Pin Numbers
53
54
55
56
57
58, 59
60
61
62
63
65
66
67
68
78
90
91
92
93
94
95
96
I/O
O
I
O
I
I/O
—
O
O
I
I/O
I
I
I
O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
Descriptions
Analog output of PCSPKI with volume control.
Normally low digital PC speaker signal input. This signal is converted to an analog signal
with volume control and appears on analog output PCSPKO.
MIDI serial data output.
MIDI serial input. Schmitt trigger input with internal pull-up resistor. Either MPU-401 or
SoundBlaster formats.
Serialized IRQ. (Optional motherboard implementation.)
Reserved.
PCI interrupt request.
PC/PCI serialized DREQ output. (Optional motherboard implementation.)
PC/PCI serialized DACK input optional motherboard implementation.
PCI clock state for power management.
PCI reset.
PCI clock. This clock times all PCI transactions.
PCI busmaster grant.
PCI busmaster request, tri-state output.
PCI device select for configuration.
PCI cycle frame.
PCI initiator ready.
PCI target ready.
PCI device select.
PCI stop transaction.
PCI lock.
PCI parity.
ORDERING INFORMATION
Part Number
ES1938S
Description
PCI
AudioDrive
Package
100-pin LQFP
ESS Technology, Inc.
48401 Fremont Blvd.
Fremont, CA 94538
Tel: (510) 492-1088
Fax: (510) 492-1898
4
No part of this publication may be reproduced, stored in a
retrieval system, transmitted, or translated in any form or
by any means, electronic, mechanical, manual, optical, or
otherwise, without the prior written permission of ESS
Technology, Inc.
ESS Technology, Inc. makes no representations or
warranties regarding the content of this document.
All specifications are subject to change without prior
notice.
ESS Technology, Inc. assumes no responsibility for any
errors contained herein.
(P) U.S. patents pending.
AudioDrive
is a registered trademark of ESS Technology,
Inc.
ESFM
is a trademark of ESS Technology, Inc.
Certain audio features of this product manufactured under
a license from Desper Products, Inc., Spatializer and
the circle-in-square device are trademarks owned by
Desper Products, Inc. U. S. Patent numbers #4,308,423,
#4,355,203, #5,412,731.
All other trademarks are owned by their respective
holders and are used for identification purposes only.
© 2001 ESS Technology, Inc. All rights reserved.
SAM0290-030601
Embedded System
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