Cirrus Logic CS4611-CM, CS4610C-CQ, CS4610-CM Datasheet

CS4610/11

Advanced Product Databook

FEATURES

■ High Performance PCI Audio Accelerator

— Powerful RAM-based SLIMD™ DSP core provides high

task concurrency and maximum flexibility

— Efficient bus mastering PCI interface minimizes host

loading

— DMA engine with hardware scatter-gather manages up

to 96 simultaneous audio/data streams

■ Flexible Digital Audio Interface Design

— Direct Connection to CS423x Codec
— Simple expansion to 6 audio output channels
— Direct Connection to CS4297 AC’97 Codec

■ Complete Solution including DSP Software and

Windows 95

— Acceleration of DirectSound®, DirectSound3D®, Direct-

Input™, and DirectS how™ APIs
— High Quality HRTF-Based 3D Positional Sound
— General MIDI Wavetable Synthesis with Reverb and

Chorus
—Dolby® AC-3® (5.1 channel) and MPEG-2 Audio Decod-

ing (CS4610 only) with speaker virtualization

®

drivers

DESCRIPTION

The CS4610/11 is a high performance audio accel­erator for the PCI bus. This device, combined with
application and driver software, provides a com­plete system solution for hardware acceleration of
Windows 95 DirectSound, DirectSound3D, Direct­Input, DirectShow, and Wavetable Synthesis.

CrystalClear™

SoundFusion™ PC I Audio

Accelerator

The CS4610/11 is based on t he Cirrus Logi c, Crys­talClear Stream Processor (SP) DSP c ore. The SP
core is optimized for digital audio processing, and
is powerful enough to handle complex signal pro­cessing tasks such as Dolby AC-3 decoding
(CS4610 only) with ease. The S P core is supported
by a bus mastering PCI in terface and a built-in ded­icated DMA engine with hardware scatter-gather
support. These support functions ensure extremely
efficient transfer of audio data streams to and from
host-based memory buffers, providing a system
solution with maximum performance and minimal
host CPU loading.

The all-digital CS4610/11 supports a variety of au­dio I/O configurations, including direct connection
to the CrystalClear CS423x Codecs via a bi-direc­tional serial data link, or direct connection to an

AC’97 Codec such as the CrystalClear CS4297.

ORDERING INFORMATION

CS4610-CM 100-pin MQFP 20x14x3.07 mm
CS4610C-CQ 128-pin TQFP 20x14x1.60 mm
CS4611-CM 100-pin MQFP 20x14x3.07 mm

96-Stream

DMA Controll er

with Hardware

Scatter/Gather

Interrupt

PCI

Controller

Interface

MPU-401

MIDI Interface

Joystick
Interface

DS241PP5 MAR ‘98

Copyright  Cirrus Logic, Inc. 1998

(All Rights Reserved)

Parameter

RAM

Program

RAM

Sample

RAM

Coefficient

ROM

SLIMD

SP Core

GPIO

AC ’97

Interface

423x Interface

and Dual I S

Output

PLL Clock
Generator

2

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

ABSOLUTE MAXIMUM RATINGS

(PCIGND = CGND = CRYGND = 0 V, all voltages with respect to 0 V)

Parameter Symbol Min Typ Max Unit

Power Supplies PCIVDD

CVDD

CRYVDD

VDD5REF
Total Power Dissipation (Note 1) - - 1.5 W
Input Current per Pin, DC (Except suppl y pins) - - 10 mA
Output current per pin, DC - - 10 mA
Input voltage (Note 2) -0.3 - 5.75 V
Ambient temperature (power applied) (Note 3) -45 - 85 °C
Stor age temperature -55 - 150 °C

Notes: 1. Includes all power generated by AC and/or DC output loading.

2. The power supply pins are at reco mmende d maximum valu es. XTALI & XTALO are at 3.6 V maximum.

3. At ambient temperatures above 70° C, total power dissipation must be limited to less than 0.4 Watts.

-

-

-

-

-

-

-

-

4.6

4.6

4.6

5.5

V
V
V
V

WARNING: Operation beyond these limits may result in permanent damage to the device.

Normal operation is not guaranteed at these extremes.

RECOMMENDED OPERATING CONDITIONS

(PCIGND = CGND = CRYGND = 0 V, all voltages with respect to 0 V)

Min Typ Max Min Typ Max

Parameter Symbol

Power Supplies PCIVDD

CVDD

CRYVDD

VDD5REF
Internal DSP Frequency - - 100 - - 85 MHz
Operating Ambient Temperature T

Dolby’s AC3 Technology is implemented on the CS4610 Stream Processor Only. Supply of this Implementation of Dolby
Technology does not convey a license nor imply a right under any patent, or any other Industrial or Intellectual Property
Right of Dolby Laboratories, to use this Implementation in any finished end-user or ready-to-use final product. It is hereby
notified that a license for such use is required from Dolby Laboratories.

Specifications are subject to change without notice.

A

3
3
3

4.75

0257002570°C

3.3

3.3

3.3
5

3.6

3.6

3.6

5.25

3
3
3

4.75

3.3

3.3

3.3
5

3.6

3.6

3.6

5.25

UnitCS4610 CS461 1

V
V
V
V

Dolby and AC-3 are registered trademarks of Dolby Laboratories Licensing Corporation.
Windows, Windows 95, DirectSound, and DirectSound3D are registered trademarks of Microsoft Corporation.
DirectInput, DirectX and DirectShow are trademarks of Microsoft Corporation.
Sound Blaster and Sound Blaster Pro are trademarks of Creative Technology, Ltd.
Crystal, CrystalClear, SLIMD and SoundFusion are trademarks of Cirrus Logic, Inc.
All other names are trademarks, registered trademarks, or service marks of their respective companies.

2 DS241PP5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

AC CHARACTERISTICS (PCI SIGNAL PINS ONLY) (T

= 70° C;

A

PCIVDD = CVDD = CRYVDD = 3.3 V; VDD5REF = 5 V; PCIGND = CGND = CRYGND = 0 V;
Logic 0 = 0 V, Logic 1 = 3.3 V; Reference levels = 1.4 V; unless otherwise noted; (Note 4))

Parameter Symbol Min Max Unit

Switching Current High (Note 5)

0 < Vout < 1.4

1.4 < Vout < 2.4

3.1 < Vout < 3.3

Switching Current Low (Note 5)

Vout > 2.2

2.2 > Vout > 0.55

0.71 > Vout > 0

Low Clamp Current -5 < Vin < -1 I

I

I

OH

OL

CL

-44

Vout

44–

---------------------------+

0.024

-

95

Vout /0.023

-

Vin

25–

-------------------+

0.015

-

1.4–

-

mA
mA

Note 7

-

-

mA
mA

Note 8

1+

-mA

Output rise slew rate 0.4 V - 2.4 V load (Note 6) slewr 1 5 V/ns
Output fall slew rate 2.4 V - 0.4 V load (Note 6) slewf 1 5 V/ns

Notes: 4. Specifications guaranteed by characterization and not production testing.

5. Refer to V/I curves in Figure 1. Specification does not apply to CLK and RST# signals. Switching Current
High specification does not apply to SERR# and INTA# which are open drain outputs.

6. Cumulative edge rate across specified range. Rise slew rates do not apply to open drai n outputs.

7. Equation A: I

8. Equation B: I

= 11.9 * (Vout - 5.25) * (Vout + 2.4 5 ) for 3.3 V > Vout > 3.1 V

OH

= 78.5 * Vout * (4.4 - Vout) for 0 V < Vout < 0.71 V

OL

AC drive
point

Pull U p

-

3.3

test
point

2.2

0.55

Current (mA) Curre nt (mA)

44

-

176

voltage voltage

3.3

2.4

DC

1.4

drive point

-2

I = 11.9*(Vout-5.25)*(Vout+2.45)

OH

for 3.3V > Vout > 3.1 V

Figure 1. AC Characteristics

Pull Down

AC drive
point

DC drive
point

test
point

3, 6 95 380

Equation B:Equation A:

I = 78.5*Vout*(4.4-Vout)

OL

for 0V < Vout< 0.71V

DS241PP5 3

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

DC CHARACTERISTICS (T

= 70° C; PCIVDD = CVDD = CRYVDD = 3.3 V; VDD5REF = 5 V;

A

PCIGND = CGND = CRYGND = 0 V; all voltages with respect to 0 V unless otherwise noted)

Parameter Symbol Min Typ Max Unit

PCI Inte rf a ce S ig n a l P in s

High level input volta ge V
Low level input vol tage V
High level output voltage Iout = -2 mA V
Low level output voltage Iout = 3 mA, 6 mA (Note 9) V
High level leakage current Vin = 2.7 V (Note 10) I
Low level leakage current Vin = 0.5 V (Note 10) I

IH

IL

OH

OL

IH

IL

2-5.75V

-0.5 - 0.8 V

2.4 - - V

--0.55V

--70µA

---70µA

Non-PCI Interface Signal Pins (Except XTALO)

High level input volta ge XTALI

Other Pins

Low level input vol tage XTALI

Other Pins

High level output voltage Iout = -4 mA (Note 11) V
Low level output voltage Iout = 4 mA V
High level leakage current Vin = 5.25 V I
Low level leakage current Vin = 0 I

V

IH

V

IL

OH

OL

IH

IL

2.3
2

-0.5

-0.5

3.3

-

0

-

2.4 - - V

--0.4V

--10µA

---10µA

4.0

5.75

0.8

0.8

V
V

V
V

Min Typ Max Min Typ Max

Parameter

UnitCS4610 CS4611

Power Supply Pins (Outputs Unloaded)

Power Supply Current: VDD5REF
PCIVDD/CVDD/CRYVDD Total (Notes 4,12)

-

-

0.6

200

-

370

-

-

0.6

164

-

240

mA
mA

Low Power Mode Supply Current - 10 - - 10 - mA

Notes: 9. The following signals are tested to 6 mA: FRAME#, TRDY#, IRDY#, DEVSEL#, STOP#, SERR#,

PERR#, and INTA#. All other PCI interface signals are tested to 3 mA.

10. Input leakage currents incl ude hi-Z outp ut l eakage f or al l bi -dire cti onal buf fers wit h th ree-st ate outp uts.
At supply voltages of 3.6 V or higher and amb ient temperatures of 70° C, the high level leakage current
may exceed 70 µA. For normal operating ranges of 25° C and a supply voltage of 3.3 V, t he high level
leakage current is within specification.

11. For open drain pins, high level output voltage is dependent on external pull-up used and number of
attached gates.

12. Typical values are given as average curr ent with t ypical SP task execution and data st reaming. Cur rent
values vary dramatically based on the software running on the SP.

4 DS241PP5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

PCI INTERFACE PINS (T

PCIGND = CGND = CRYGND = 0 V; Logic 0 = 0 V, Logic 1 = 3.3 V; Timing reference levels = 1.4 V)

Parameter Symbol Min Max Unit

PCICLK cycle time t
PCICLK high time t
PCICLK low time t
PCICLK to signal valid delay - bused signals t
PCICLK to signal valid delay - point to point t
Float to active delay (Note 13) t
Active to Float delay (Note 13) t
Input Set up Time to PCICLK - bused signals t
Input Set up Time to PCICLK - point to point t
Input hold time for PCICLK t
Reset active time after PCICLK st able (Note 14) t
Reset active to output float delay (Notes 13, 14, 15) t

Notes: 13. For Active/Float measureme nts, t he Hi-Z or “of f” st ate i s whe n the t otal curren t deliver ed is l ess tha n or

equal to the leakage current . Specification is guarant eed by design, not production tested.

14. RST# is asserted and de-asserted asynchronously with re spect to PCICLK.

15. All output drivers are asynchronously floated when RST# is active.

= 0 to 70° C; PCIVDD = CVDD = CRYVDD = 3.3 V; VDD5REF = 5 V;

A

cyc

high

low

val

val(p+p)

on
off
su

su(p+p)

h

rst-clk

rst-off

30 - ns
11 - ns
11 - ns

211ns
212ns
2-ns

-28ns

7-ns

10, 12 - ns

0-ns

100 -

-40ns

µ

s

PCICLK

RST#

t

rst-clk

t

off

t

on

OUTPUTS

Hi-Z

t

val

OUTPUTS

Valid

t

su

INPUTS

Figure 2. PCI Timing Measurement Conditions

Valid
Input

t

h

t

rst-off

DS241PP5 5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

CS4610/11 + CS423X CONFIGURATION (T

= 0 to 70° C;

A

PCIVDD = CVDD = CRYVDD = 3.3 V; VDD5REF = 5 V; PCIGND = CGND = CRYGND = 0 V;
Logic 0 = 0 V, Logic 1 = 3.3 V; Timing reference levels = 1.4 V; unless otherwise noted)

Parameter Symbol Min Typ Max Unit

SCLK input cycle time t
FSYNC input cycle time t
SCLK rising to FSYNC transition t
SCLK rising to SDOUT valid t
SDIN valid to SCLK falling t
SDIN hold after SCLK falling t
LRCLK output cycle time t
SCLK falling to LRCLK transition t
SCLK falli n g to S DO 2 /S D O3 valid t
SDIN2 valid to SCLK rising (SI2F1-0: 00) t
SDIN2 hold after SCLK rising (SI2F1- 0: 00) t
SDIN2 valid to SCLK falling (SI2F1-0: 01) t
SDIN2 hold after SCLK fallin g (SI2F1-0: 01) t

sclk

fsync

pd1
pd2

s1

h1

lrclk

pd3
pd4

s2

h2

s3

h3

320 354 - ns

20480 22676 - ns

-20 - 20 ns

-2545ns
30 - - ns
30 - - ns

20480 22676 - ns

-2545ns

-2545ns
30 - - ns
30 - - ns
30 - - ns
30 - - ns

SCLK

FSYNC

SDOUT

SDIN

LRCLK

SD02/SD03

SDIN2

SDIN2

t

s1

t

t

s3

h1

15

15

t

s2

19 18

t

sclk

t

pd1

t

pd2

14 0

14

t

pd3

17

16

t

fsync

15

14

0

15

t

pd4

15

0

t

h2

0

0

15

14

0

17 16

19

18

0

15

00

t

lrclk

15

0

0

0

t

h3

Figure 3. CS4610/11 and CS423x Link and 6 Channel Output Timing Diagram

6 DS241PP5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

AC’97 SERIAL INTERFACE TIMING (T

VDD5REF = 5 V; VDD5REF = 5 V; PCIGND = CGND = CRYGND = 0 V; Logic 0 = 0 V, Logic 1 = 3.3 V;
Timing reference levels = 1.4 V; unless otherwi se noted)

Parameter Symbol Min Typ Max Unit

ABITCLK cycle time t
ABITCLK rising to ASDOUT valid t
ASDIN valid to ABITCLK falling t
ASDIN hold after ABITCLK falling t
PCICLK rising to ARST# valid t

t

= 0 to 70° C; PCIVDD = CVDD = CRYVDD = 3.3 V;

A

aclk
pd5

s5
h5

pd6

aclk

78 81.4 - ns

-1725ns

15 - - ns

5--ns

-10- ns

ABITCLK

ASYNC

ASDOUT

t

pd5

t

s5

ASDIN

ARST#

PCICLK

t

h5

Figure 4. AC’97 Configuration Timing Diagram

t

pd6

DS241PP5 7

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

EEPROM TIMING CHARACTERISTICS Note 4. (T

= 0 to 70 °C, PCIVDD = CVDD = CRYVDD =

A

3.3 V; VDD5REF = 5 V; VDD5REF = 5 V; PCIGND = CGND = CRYGND = 0 V; Logic 0 = 0 V, Logic 1 = 3.3 V;
Timing reference levels = 1.4 V; PCI clock frequency = 33 MHz; unless otherwise noted)

Parameter Symbol Min Max Units

EECLK Low to EEDAT Data Out Valid t
St art Condition Hold Ti me t
EECLK Low t
EECLK High t
St art Condition Setup Ti me (for a Repeated St art Condition) t
EEDA T In Hold Time t
EEDAT In Setup Time t

HD:STA

LEECLK

HEECLK

SU:STA

HD:DAT

SU:DAT

EEDAT/EECLK Rise Time (Note 16) t
EEDAT/EECLK Fall Time t
Stop Condition Setup Time t

SU:STO

EEDAT Out Hold Time t

AA

R

F

DH

07.0

5.0 ­10 ­10 -

5.0 -

0-

250 - ns

-1

-300ns

5.0 -

0-

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

µ

s

Notes: 16. Rise time on EEDAT is determined by the capacitance on the EEDAT line wi th all connected gat es and

the required external pull-up resistor.

t

t

F

HEECLK

t

LEECLK

t

R

EECLK

EEDAT (IN)

EEDAT (OUT)

EEDAT (OUT)

t

SU:STA

t

HD:DAT

t

HD:STA

t

AA

Figure 5. EEPROM Timing

t

SU:DAT

t

SU:STO

t

DH

8 DS241PP5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

OVERVIEW

The CS4610 and CS4611 are high performance au­dio accelerator DSPs for the PCI bus. These devic­es, combin ed with applic ation and drive r software,
provide a com plete syste m solutio n for cost e ffec-

®

tive acceleration of Windows
DirectSound3D, DirectInput, DirectShow, MIDI
playback vi a Wav etable Sy nthesis with reverbe ra­tion and chorus effect s processing, and more.

The CS4610 is a high-performance, full-featured
version of the So undF usion au dio acce le rato r. The
CS4611 is a r educed-cost ver sion of the CS46 10.
The CS4611 has a lower max clock speed and does
not support AC-3 o r MPEG-2. Please refer to the
OEM Software Reference Manual for more details.

There are t hree main func tional blocks wi thin the
CS4610/11: the Stream Processor, the PCI Inter­face, and the DMA Engine. The Stream Processor
(SP) is a high speed custom Digital Signal Proces­sor (DSP) core designed by Cirrus Logic, Inc. spe­cifically for audio signal processing. This
extremely powerful DSP core is capable of running
complex algorithms such as Dolby Digital AC-3 or
MPEG-2 audio decod ing for applications such as
DVD movie playback or gaming. The SP is capable
of running a numbe r o f diffe rent sign al pro cessin g
algorithms simultaneously. This high concurrency
capabilit y is valuable for applications such as im mer­sive 3D games, which may play a n umb er of Direct­Sound stre ams, a number o f DirectSoun d3D streams,
and a MIDI music sequence simultan eo usly.

DirectSound,

to meet th e requireme nts of a variety of d ifferent

applications, such as DirectX™ games, DVD mov­ie playback, or DOS applications. This RAM-based
architec ture also prov ides a mean s for future sys­tem upgrades, allowin g the addi tion o f new or up­graded functio nal ity through software up da te s.

The CS4610/11 provides an extremely efficient bus
mastering interfa ce to the PC I bus. The P CI Inte r­face functi on allows eco nom i ca l burst mode t r ans­fers of audio data between host system memory
buffers and t he CS4610/11 device. Program code
and parameter data are also transferred to the
CS4610/11 over the PCI Interface.

The CS4610/11 DMA Engine provides dedicated
hardware to manage transfer of up to 96 concurrent
audio/data stream s to a nd from h ost me mory buf f­ers. The DMA Engine provi des hardware scatter­gather support, allowing simple buffer allocation
and management. This implementation improves
system efficiency by minimizing the number of
host interrupts.

The CS4610/11 supports a variety of audio I/O
configurations, including direct connection to the
CrystalClear CS 423x Codecs or to an AC’97 Co ­dec such as the CrystalClear CS4297. The system’s
flexibility is further enhan ced by the inclusion of
auxiliary ADC and DAC ports, a bi-direction al se­rial MIDI port, a jo ysti ck po rt, a hardwa re vo lum e
control inte rface, and a serial data port which al­lows con nec t ion of an o pti onal e xter nal EEP R OM
device.

Separate RAM memori es are include d on-chip for
the SP program code (Program RAM), paramete r
data (Parameter RAM), and audio sample data
(Sample RAM). A small ROM memory (Coeffi­cient ROM ) is included t o store fixed coef ficient
data required for the sample rate conversion and
audio decompression algorithm s.

The RAM-based DSP architecture of the
CS4610/11 ensures maximum system flexibility.
The software function/fe ature mix ca n be adapte d

DS241PP5 9

The block di agram in Figure 6 depi cts a mother­board audio subsystem based on the CS4610/11
and the CS423x. This approach features the proven
ISA legacy suppo rt of the CS423x Co decs (which
include the CS423xB family as well as the CS4235
and CS4239 d evices). The CS423x provides DOS
applications with hardware compatibility for the
Sound Blaster Pro™, OPL3, and MPU-401 register
sets. In this configuration, the CS423x also pro­vides the system joystick interface. The CS423x