ESS ES1938S Datasheet

	ES1938
ESS Technology, Inc.	PCI AudioDrive® Solution
	Product Brief

DESCRIPTION

The ES1938 PCI AudioDriveâ 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 Microsoftâ 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, ESFMTM 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 IntelâPentiumâ, Pentium IIâ, 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 Spatializerâ VBXä 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.

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

•IntegratedSpatializer 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 SoundBlasterTM and SoundBlaster ProTM

•Meets PC 98 / PC 99 and WHQL specifications

ESS Technology, Inc.

SAM0290-030601

1

ES1938 PRODUCT BRIEF

BLOCK DIAGRAM

Figure 1 shows the ES1938 block diagram.

MIC

ANALOG SUBSYSTEMS

LINE_L

RECORDING

STEREO

OUTPUT VOLUME

LINE_R

AOUT_L

SOURCE

PROGRAMMABLE

AND MUTE CONTROL

AUXA_L

AOUT_R

AND INPUT

AUXA_R

MIXER

RECORD MONITOR

MONO_OUT

VOLUME

AUXB_L

AUXB_R

CONTROL

SWITCHED

MONO_IN

CAPACITOR

FOUT_L

LOW-PASS FILTER

CMR

REF GEN

16-BIT STEREO

FOUT_R

VDDA

GNDA

GAME DAC/ADC

CIN_L

CAP3D

3D PROCESSOR*

16-BIT STEREO

CIN_R

PCSPKI

MUSIC DAC

PC SPEAKER

16-BIT STEREO

PCSPKO

VOLUME CTRL

SYSTEM DAC

DATA BUFFER WITH

HARDWARE

VOLDN

256 BYTE FIFO

VOLUME

VOLUP

CONTROL

AD[31:0]

INTAB

ESFM FM MUSIC

SYNTHESIZER

SIRQ

PCLK

PRSTB

SID AND SVID

CBE[3:0]B

CONFIGURATION

PAR

FRAMEB

PCI BUS

IRDYB

MCLK

TRDYB

WAVETABLE

STOPB

INTERFACE

SERIAL PORT

MSD

IDSEL

DEVSELB

MSI

REQB

MPU-401 SERIAL

GNTB

PORT AND FIFOs

MSO

LOCKB

CLKRUNB

PCPCIREQB

DUAL

SW(A-D)

PCPCIGNTB

GAME PORT

T(A-D)

ROM

CLOCK

XI

AND

MICROCONTROLLER

GENERATOR

XO

RAM

AND TIMER

*3D Processor usesSpatializer VBX 3D technology provided by Desper Products, Inc. a subsidiary of Spatializer Audio Laboratories, Inc.

Figure 1 ES1938 Block Diagram

PINOUT

Figure 2 shows the ES1938 pinout diagram.

AOU T_ R

GN DD

PCSPKO

PCSPKI

MSO

MSI

S I R Q

NC

NC

I NTAB

PCPCI REQB

P C P C I G N T B

CL KRUNB

VDDD

PRSTB

PCL K

GN TB

R E Q B

A D 3 1

AD3 0

AD2 9

AD2 8

AD2 7

A D 2 6

AD2 5

AD24	75	51
	76	50
CBE3B
IDSEL
AD23
VDDD
GNDD
AD22
AD21		ES 1938S
AD19
AD20
AD18
AD17
AD16		100-Pin LQFP
FRAMEB
CBE2B
IRDYB
TRDYB
DEVSELB
STOPB
LOCKB
PAR
CBE1B
AD15
AD14
GNDD	100	26

1

25

A O U T _ L

L I N E _ R

L I N E _ L

C I N _ R

C I N _ L

F O U T _ L F O U T _ R V D D A

C A P 3 D

G N D A M I C

C M R

A U X A _ R A U X A _ L A U X B _ R A U X B _ L S W A

S W B

S W C

S W D

T A

T B

T C

T D

M O N O _ I N

VDDD AD1 3 AD1 2 AD1 1 AD1 0 AD9 AD8 CBE0 B AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 VDDD XO XI VOL DN VOLU P MCL K MSD GNDD MONO_ OU T

Figure 2 ES1938 Pinout Diagram

2

SAM0290-030601

ESS Technology, Inc.