C371347_139780418F8DFE40697A24CD62AD2CE5.pdf - 第13页

CM108B

USB Audio Single Chip

Datasheet Revision: 1.11 www.cmedia.com.tw

Offset

Field

Size

Value (Hex)

Description

0

bLength

1

09

Total 9 Bytes

1

bDescriptorType

1

02

Configuration Descriptor

2

wTotalLength

2

XXXX

Total length of data returned for this configuration:

Programmable by MSEL and MODE pin

4

bNumInterfaces

1

04

Number of interfaces supported by this Configuration:

0: control interface 1: ISO-OUT interface

2: ISO-IN interface 3: INT-IN(HID) interface

5

bConfigurationValue

1

01

Configuration value

6

iConfiguration

1

00

Index of string descriptor describing this configuration

7

bmAttributes

1

80

Bus Power and support Remote Wakeup

8

bMaxPower

2

32

Maximum power consumption of the USB Device: 100mA

7.1.2 USB audio topology diagram for speaker

Device Descriptor

Offset

Field

Size

Value (Hex)

Description

0

bLength

1

12

Descriptor length

1

bDescriptorType

1

01

Device Descriptor

2

bcdUSB

2

0110

USB 1.1 compliant

4

bDeviceClass

1

00

Device class specified by interface

5

bDeviceSubClass

1

00

Device subclass specified by interface

6

bDeviceProtocol

1

00

Device protocol specified by interface

7

bMaxPacketSize0

1

08

Endpoint zero packet size

8

idVendor

2

0d8c

Vendor ID

10

idProduct

2

0012

Product ID

12

bcdDevice

2

0100

Device release number

14

iManufacturer

1

01

Index of string descriptor describing manufacturer

15

iProduct

1

02

Index of string descriptor describing product

16

iSerialNumber

1

00

Index of string descriptor describing serial number

17

bNumConfigurations

1

01

Number of configuration

Configuration Descriptor

Offset

Field

Size

Value (Hex)

Description

0

bLength

1

09

Descriptor length

1

bDescriptorType

1

02

Configuration Descriptor

2

wTotalLength

2

XXXX

Total length of data returned for this configuration:

Programmable by MSEL and MODE pin

4

bNumInterfaces

1

03

Number of interfaces supported by this Configuration:

00: Control

01: ISO-Out

02: INT-IN (HID)

5

bConfigurationValue

1

01

Configuration value

6

iConfiguration

1

00

Index of string descriptor describing this configuration

7

bmAttributes

1

80

Attributes(PWRSEL=0:Bus Powered, 1:SELF Powered)

8

bMaxPower

1

32

Maximum power consumption from bus = 100mA

0X01

IT

0X09

FEA

0X06

OT

CM108B

USB Audio Single Chip

Datasheet Revision: 1.11 www.cmedia.com.tw

7.1.3 Content format for EEPROM (93C46)

Each address has 2-byte data, prefix `0x` means hex number

Address(Hex)

Description

0x00

bit[15:4] Magic Word

0x670X where X = bit 4, 3, 2, 1

bit[3] The value within address 0x2A, 0x2B, 0x32 is valid 1: valid 0: invalid

bit[2] reserved, should be 1

bit[1] serial number enable control 1: enable, 0: disable(default)

bit[0] reserved, should be 1

0x01

VID 2-byte

0x02

PID 2-byte

0x03

Serial number 1st

byte

(bit15-bit8, first

character)

Serial number length

(bit7-bit0)

0x04

~

0x09

Serial number 12-byte

0x0A

Product string 1st

byte (bit15-bit8, first

character)

Product string length

(bit7-bit0) [0x3E->30,0x40->31Char]

0x0B

~

0x19

Product string 30-byte (default: USB Audio Device)

0x1A

Manufacturer string

1st byte

(bit15-bit8, first

character)

Manufacturer string length

(bit7-bit0) [0x3E->30,0x40->31Char]

0x1B

~

0x29

Manufacturer string 30-byte (default: C-Media Electronics Inc.)

0x2A

bit[15: 9] DAC initial volume (7-bit, default = -10dB)

bit[8: 3] ADC initial volume (6-bit, default = 8dB)

bit[2] DAC EEPROM MAX/MIN volume valid

bit[1] ADC EEPROM MAX/MIN volume valid

bit[0] AA EEPROM MAX/MIN volume valid

0x2B

bit[15:11] AA initial volume (5-bit, default = -7dB)

bit[10] Reserved, should be 0

bit[9] Boost mode 0: 22dB 1:12dB (default)

bit[8] Shout down DAC analog circuits 1: shoutdown, 0: active(default)

bit[7] Total Power Control 1:enable, 0:disable(default)

bit[6] Reserved, should be 0

bit[5] MIC High Pass Filter 1:enable(default), 0:disable

bit[4] MIC PLL Adjust 1:enable, 0:disable(default)

bit[3] MIC BOOST 1:enable (default), 0:disable

bit[2] DAC Output Terminal property set to SPK or HP

1: Headset, 0: Speaker(default) bit[1] HID, 1: enable (default), 0: disable

bit[0] Remote wakeup, 1:enable, 0:disable(default)

0x2C

bit[15:0] DAC Minimum Volume (0xD300, DAC-Min.=-37dB, default=-37dB)

0x2D

bit[15:0] DAC Maximum Volume (0x0000, DAC-Max.=0dB, default=0dB)

0x2E

bit[15:0] ADC Minimum Volume(0xEA00, ADC-Min.=-22dB, default=-12dB)

0x2F

bit[15:0] ADC Maximum Volume(0x1700, ADC-Max.=+23dB, default=+23dB)

0x30

bit[15:0] AA Minimum Volume (0xE900, AA-Min.=-23dB, default=-23dB)

0x31

bit[15:0] AA Maximum Volume (0x0800,AA-Max.+8dB, default=+8dB)

0x32

EE_OPTION2 Register

bit[3] Reserved, should be 0

bit[2] Reserved, should be 0

CM108B

USB Audio Single Chip

Datasheet Revision: 1.11 www.cmedia.com.tw

bit[1] Reserved, should be 0

bit[0] Reserved, should be 0

~ END

7.1.4 EEPROM SPI interface timing information

CS

SK

DI

DO(READ)

DO(PROG)

t

SV

t

PD1

t

DF

t

DF

t

CSH

t

SKL

t

SKH

t

CSS

t

PD0

t

DIH

t

DIS

STATUS VALID

Symbol

Parameter

Test Condition*

Min

Typ

Max

Units

f

SK

SK Clock Frequency

2.7V<=Vcc<=5.5V

0

-

200

KHz

t

SKH

SK High Time

2.7V<=Vcc<=5.5V

250

-

ns

t

SKL

SK Low Time

2.7V<=Vcc<=5.5V

250

-

ns

t

CS

Minimum CS Low Time

2.7V<=Vcc<=5.5V

250

-

ns

t

CSS

CS Setup Time

2.7V<=Vcc<=5.5V

50

-

ns

t

DIS

DI Setup Time

2.7V<=Vcc<=5.5V

100

-

ns

t

CSH

CS Hold Time

2.7V<=Vcc<=5.5V

0

-

ns

t

DIH

DI Hold Time

2.7V<=Vcc<=5.5V

100

-

ns

t

PD1

Output Delay to"1"

2.7V<=Vcc<=5.5V

-

250

ns

t

PD0

Output Delay to"0"

2.7V<=Vcc<=5.5V

-

250

ns

t

SV

CS to Status Valid

2.7V<=Vcc<=5.5V

-

250

ns

t

DF

CS to DO in High

Impedance

2.7V<=Vcc<=5.5V

-

100

ns

t

WP

Write Cycle Time

4.5V<=Vcc<=5.5V

0.1

3

10

ms

* based on ATMEL 93C46 EEPROM data