The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 2 -

1. GENERAL DESCRIPTION

The W9975D is a DSP based speech processor that performs speech compression and decompression functions.
The W9975D can provide speech compression for H.324 and H.323 Video Phone, Internet Telephony, and IP
Telephony products over standard PSTN or IP network. The compression algorithm complies with ITU-G.723.1
speech compression standard specified under H.324 and H.323. When the W9975D compresses and
decompresses the sampled voice data according to the ITU-G.723.1 algorithm, the compressed data rates are
either 6.3 or 5.3Kbps. G.711 is also implemented in this chip to ensure the compatibility with most VOIP
applications. In addition to the speech compression and decompression functions, the W9975D also provides
functions like electric echo cancellation (EEC), call progress tone generation, DTMF tone detection, DTMF tone
generation, and half-duplex speaker phone functions. The host interface of the W9975D is the parallel interface
(ECP), all commands must be sent through the simple host interface (ECP) to control the W9975D. The system' s
host processor provides activation and control of all the related functions of the W9975D.

The sampling rate for ITU-G.723.1 is 8K and support 5.3K/6.3K bit data rate. With the implementation of
ITU-G.723.1, W9975D can deliver high quality speech in its associated applications. The W9975D has built-in
Synchronous Serial Port, makes it easy to interface with external voice PCM CODEC. All these features make the
W9975D suitable for the H.324 and H.323 related applications.

The W9975D is a 3.3V device with TTL-level compatible 3.3V only I/O, and is packaged in a 128-pin LQFP.

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 3 -

2. FEATURES

DSP CORE

30 MIPS 24-bit instruction, 16-bit integer

data DSP core

Internal one Instruction and two data access at one cycle

Built-in two bank instruction ROM. 13Kx24 and 4Kx24

Built-in 8Kx16 ROM and 4Kx16 SRAM for 1st way data access

Built-in 2Kx16 ROM and 1Kx16 SRAM for 2nd way data access

Low power consumption

CODEC Interface

Synchronous serial port connecting external CODEC device for voice input and output

Host Interface

IEEE 1284 parallel port with byte mode support for Host interface.

Compression algorithm

Provides ITU-G.723.1 MP-MLQ(5.3K/6.3K bps) voice codec

Provides G.711 PCM codec

8K voice sampling rate

Provide Silence-Detection and Comfort-Noise-Generation

Other Features

Electrical Echo Cancellation

DTMF Tone Generation and Detection

Call progress tone generation

Half duplex speaker phone mode supported

Operation Frequency is 30MHz

3.3V Device with TTL-compatible 3.3V I/O

128L LQFP Package

3. PIN CONFIGURATION

The W9975D is packaged in a 128-pin LQFP. The

pin configuration is shown in Figure 3.1

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 4 -

MA12/NSELI

MA13/NINIT

MA14/NAUFD

MA15/NSTB

MA16/PD0

MA17/PD1

MA18/PD2

MA19/PD3

MA20/PD4

MA21/PD5

MA22/PD6

MA23/PD7

MD0

MD1

VSS

DH2

VLCD3

VLCD2

VLCD1

SEG16

SEG17

SEG14

SEG15

SEG13

SEG11

SEG12

SEG10

SEG22

SEG23

SEG24

SEG6

SEG5

SEG4

SEG9

SEG8

SEG7

SEG3

SEG2

MA2

MA1

MA0

WE#

OE#

MD2

MD3

MD4

MD5

MD6

VSS

100

VSS

PIO0

PIO1

PIO2

PIO3

PIO4

W 9 9 7 5 D

1 2 8 -p i n L Q F P

VSS

VDD

VSS

DH1

VSS

VDD

SEG18

SEG19

MA3

MA4/UP_DATA

MA5/UP_CLK

MA6/UP_REQ

MA7/NFAUT

MA8/PE

MA9/SEL

MA10/BUSY

MA11/NACK

SEG21

SEG20

VDD

Figure 3.1 W9975D Pin Configuration

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 5 -

4. PIN DESCRIPTION

The following signal types are used in these description.

I Input pin

IU Input pin with internal pull-up resistor

B BI-direction input/output pin

O Output pin

AIO Analog input/output pin

P Power supply pin

G Ground pin

4.1 Pin Definition

LCD Interface

Pin Name

Pin Number Type

Description

COM0-COM3

59-62

SEG0-SEG24

63-76, 78-79,

81-89

VLCD3

VLCD2

VLCD1

DH2,DH1

94,95

SIN / WCLK

I/O

SOUT / WDATA

GPIO Interface

Pin Name

Pin Number Type

Description

PIO0

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 6 -

PIO1

PIO2

PIO3

100

PIO4

101

PIO5

103

PIO6

104

PIO7

106

PIO[8:11]

107-110

CODEC Interface

Pin Name

Pin Number Type

Description

MCLK

Serial data received from CODEC

RFS

Receiver frame sync of CODEC serial port

SCLK

Serial clock of CODEC serial port

TFS

Transmitter frame sync of CODEC serial port

Serial data transmitted to CODEC

Memory Interface

Pin Name

Pin Number Type

Description

CD2#

/Atmel#

118

CD1# /AMD#

118

BUSY#

120

WAIT#

121

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 7 -

VS#

123

CF_RST

/WP#

124

REG# /ALE

125

CE2# /CLE

126

CE1#

127

CE0#

128

OE#

WE#

MA0-MA3

3,4,5,6

MA4

/UP_DATA

MA5

/UP_CLK

MA6

/UP_REQ

NFAUT

ECP port control signal

SEL

ECP port control signal

BUSY

ECP port control signal

NACK

ECP port control signal

NSELI

ECP port control signal

NINIT

ECP port control signal

NAUFD

ECP port control signal

NSTB

ECP port control signal

PD0-7

21,22,23,25,

26,28,29,30

ECP port data signals

MD0-MD7

31,32,33,34,

35,36,38,39

NC, but MD0-MD4 must be pulled high extenally

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 8 -

35,36,38,39

MD8-15

41-49

Miscellaneous

Pin Name

Pin Number Type

Description

CLK32K,

XTAL32

111,112

Crystal pair for 32,768Hz

PWRF#

113

RESET#

114

Chip reset signal

CLKIN,

XTAL

115,116

Crystal pair for DSP operation

Power and Ground

Pin Name

Pin Number

Type Description

VDD

10,27,40,55,

80,90,105,

122

Power supply +3.3V + 0.3V

VSS

7,24,37,58,77,9

6,102,119

Ground

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 9 -

5. SYSTEM DIAGRAM

W9975D

Microphone

Host

Interface

ECP

Speaker

DSP

Core

G.711

G.723.1

CODEC

Interface

AD/DA

CODEC

Figure 5.1 W9975D- Audio Codec System Diagram

6. SYSTEM Operation

Introduction

The W9975D is a powerful speech CODEC. It supports G.723.1, G.711 protocols. The W9975D also supports
Electrical echo cancellation, DTMF tone generation, DTMF tone detection, and half duplex speaker phone
functions.

DSP simplified description

The default operations modes of the W9975D are listed as follows:

The default speech compression/decompression algorithm is ITU-G.723.1, both encode and decode are
enabled.

DTMF tone detection function is disabled.

Electric Echo Cancellation (EEC) is enabled.

EEC training in running mode is disabled.

The default value of Play Back Volume is set to -4. (Divided by 16).

The default value of Record Volume is set to 3 (Multiplied by 8).

IDLE state and RUN state

A state machine controls the program flow of the W9975D. There are two states in the state one is the

IDLE state, and the other one is the RUN state. The W9975D will enter the IDLE state after it is initialized.
Commands can be issued to the W9975D in both states. All the commands can be issued to the W9975D in the
IDLE state, but some commands cannot be issued in the RUN state. The reason is that the W9975D can only accept
two-word commands in the RUN state.

DSP commands

The DSP engine in the W9975D executes all the commands; commands are listed in the following table.

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 10 -

Command

Value

Description

States that can accept
the command

IDLE_CMD

0x0080

Enter the IDLE state (W9975D can accept
all commands in the IDLE state)

IDLE, RUN

RUN_CMD

0x0081 Enter the RUN state.

IDLE, RUN

ENABLEEECTRAIN_CMD

0x0082 Enable EEC training.

IDLE, RUN

DISABLEEECTRAIN_CMD

0x0083 Disable EEC training.

IDLE, RUN

CODEC_CMD

0x0084

CODEC setting.
Word 0: Command
Word 1: Control register.
Word 2: SCLKDIV
Word 3: RFSDIV

IDLE

ENABLEENC_CMD

0x0085 Enable G.723 encoder.

IDLE, RUN

DISABLEENC_CMD

0x0086 Disable G.723 encoder.

IDLE, RUN

EECHANGOVER_CMD

0x0087

Word0: Command
Word1: Hangover value how many
samples you want to delay after you detect
double talk.

IDLE, RUN

RECORD_CMD

0x0088

Word0: Command.
Word1:
Bit 0: Bit rate 0: 6.3 k bit/s
1: 5.3 k bit/s
Bit 1: VAD -- 1: Enable
-- 0: Disable
Bit 2: High pass filter 1: Enable
-- 0: Disable
Bit 3: Post filter 1: Enable
-- 0: Disable

IDLE, RUN

ENABLEDEC_CMD

0x0089 Enable G.723 decoder.

IDLE, RUN

DISABLEDEC_CMD

0x008A Disable G.723 decoder.

IDLE, RUN

EECPOWER_CMD

0x008B

Word 0: Command
Word 1: Power value A value multiply by
input (MIC) value, then compare with output
(SPK) value, decide now is double talk or
not.

IDLE, RUN

SETPROTOCOL_CMD

0x008C

Word 0: Command
Word 1: protocol.
0: RAW data
1: G.723 bit stream
2: G.711 U law bit stream
4: G.711 A law bit stream

IDLE, RUN

ENABLEHALF_CMD

0x008D Enable half duplex

IDLE, RUN

DISABLEHALF_CMD

0x008E Disable half duplex

IDLE, RUN

EECSUM_CMD

0x008F

Word 0: Command
Word 1: EEC sum value one of some
values to detect that double talk finished or
not.

IDLE, RUN

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 11 -

RECORDVOLUME_CMD

0x0090

Set record volume shift value.
Word 0: command.
Word 1: value.

IDLE, RUN

PLAYBACKVOLUME_CMD

0x0091

Set play volume shift value.
Word 0: command.
Word 1: value.

IDLE, RUN

VOICETHRSHOLD_CMD

0x0092

Set voice threshold. A value is set to detect
signal is noise or voice.
Word 0: Command
Word 1: value

LBENABLE_CMD

0x0093 Enable loop back.

IDLE, RUN

LBDISABLE_CMD

0x0094 Disable loop back.

IDLE, RUN

EECENABLE_CMD

0x0095 Enable EEC.

IDLE, RUN

EECDISABLE_CMD

0x0096 Disable EEC.

IDLE, RUN

TONEGAIN_CMD

0x0097

Set tone generation gain shift value.
Word 0: command.
Word 1: gain shift value.

IDLE, RUN

TONEGEN_CMD

0x0098

Tone generation command.
Word 0: command.
Word 1: tone:
1: dial tone
2: dtmf tone
3: busy tone
4: ring tone.
Word 2: tone period.
Word 3: tone silence period
Word 4: number of tones you want to make.
Max is 18.
Word 5~13: if make DTMF tones, each byte
imply a DTMF tone.

IDLE

CMD_99

0x0099

DTMFENABLE_CMD

0x009A Enable DTMF detection.

IDLE, RUN

DTMFDISABLE_CMD

0x009B Disable DTMF detection.

IDLE, RUN

CMD_9C

0x009C

EECTAP_CMD

0x009D

DTMFSHIFT_CMD

0x009E

Set DTMF shift value.
Word 0: command.
Word 1: Shift value.

IDLE, RUN

DTMFPOWER_CMD

0x009F

Driver functions description

Drivers are provided with the W9975D to simplify the use of the W9975D. User can use these drivers to

speed up the program development cycle.

audIDLE: W9975D DSP enter IDLE state.
Parameter: None

audRUN: W9975D DSP enter RUN state. The W9975D must enter this state to perform encode/decode

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 12 -

functions.

Parameter: None

audEnableEECTrain: Enable dynamic EEC training.
Parameter: None

audDisableEECTrain: Disable dynamic EEC training.
Parameter: None

audSetCodec : to set CODEC parameters.
Parameter: Codec[3]

[0]: Set control register of serial port 0

[1]: SCLKDIV

[2]: RFSDIV

audSetRecord : Set G723' s parameters.

Parameter: RecordValue

Bit 0: bit rate 0 6.3k, 1 5.3 k bit/s

Bit 1: VAD 0 disable, 1 enable

Bit 2: High pass filter 0 disable, 1 enable

Bit 3: Post filter 0 disable, 1 enable.

audEnableDTMF: Enable DTMF tone detection.
Parameter: None

audDisableDTMF: Disable DTMF tone detection
Parameter: None

audSetRecordVolume : Set record volume.
Parameter: iRecVol

iRecVol is a shift value, that is you should give integer, like as 1, 0, 1 if you give 1, it
means multiply by 2, if you give 1, it means divide by 2 and so on.

audSetPlaybackVolume : Set play back volume.
Parameter: iPlayVol

iPlayVol is a shift value, that is you should give integer, like as 1, 0, 1 if you give 1, it
means multiply by 2, if you give 1, it means divide by 2 and so on.

audEnableLoopback: Enable loop back testing
Parameter: None

audDisableLoopback: Disable loop back testing
Parameter: None

audEnableEEC: Enable EEC.
Parameter: None

audDisableEEC: Disable EEC
Parameter: None

audSetToneGain: Set tone volume for tone generation.
Parameter: iToneGain

iToneGain: is a shift value, that is you should give integer, like as 1, 0, 1 if you give 1, it

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 13 -

means multiply by 2, if you give 1, it means divide by 2 and so on.

audToneGen: Tone generation.
Parameter: atone[N]

[0]: types of tone

[1]: Tone period

[2]: Silence period

[3]: Tones how many tones you want.
-- if user define tone

[4]: Low frequency

[5]: High frequency

[6]: Low frequency level

[7]: High frequency level
-- if DTMF tones

[4]: two DTMF tones, high byte and low byte imply two different tones.

[5]: Like as [4].

...

[12]: Like as [4].

audDtmfScale: Set DTMF scale value. There may be
Parameter: iDtmfScale

iDtmfScale: is a shift value, that is you should give integer, like as 1, 0, 1 if you give 1, it
means multiply by 2, if you give 1, it means divide by 2 and so on.

audEECHangover: Set EEC hangover value to decide how many samples you want to delay after you

detect double talk.

Parameter: hangover.

Hangover: how many samples you want to delay after you detect double talk.

audEECPower: Set EEC power value in order to multiply by input (MIC) value , then compare with output

(SPK) value, decide now is double talk or not.

Parameter: Power

Power: A value multiply by input (MIC) value , then compare with output (SPK) value,
decide now is double talk or not.

audEECSum: Set EEC sum value, one of some values to detect that double talk finished or not.
Parameter: Sum

Sum: One of some values to detect that double talk finished or not.

audSetProtocol: Decide what protocol you want.
Parameter: Protocol

Protocol: 0 RAW data, 1 G723 bit stream, 2 G711 u law bit stream, 4 G711 a law bit
stream.

audEnableHalf: Enable half duplex.
audDisableHalf: Disable half duplex.
AudSetVoiceThreshold: Set voice threshold.
Parameter: VoiceThreshold.

VoiceThreshold: A value is set to detect voice or noise.

The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from

Winbond.

W9975D version 0.2 - 14 -

7. Package

The W9975D is packaged in a 128-L LQFP (14x20x1.4mm footprint 2.0mm) as shown below.

103

128

102

Detail F

See Detail F

Seating Plane

0.10

0.004

1.00

0.75

16.10

0.60

16.00

0.45

15.90

0.039

0.030

0.634

0.024

0.630

0.018

0.626

0.50

14.10

0.25

0.27

1.45

1.60

14.00

1.40

13.90

0.10

0.15

1.35

0.05

0.555

0.010

0.011

0.057

0.063

0.551

0.055

0.020

0.547

0.004

0.006

0.053

0.002

Symbol

Min

Nom

Max

Nom

Min

Dimension in inch

Dimension in mm

b
c
D

e
H

y
0

A
A

0.008

0.006

0.15

0.20

0.783

0.787

0.791

19.90

20.00

20.10

0.862

0.866

0.870

21.90

22.00

22.10

FIGURE OF 128L LQFP (14X20X1.4MM FOOTPRINT 2.0MM) DIMENSIONS

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