CM6502B Datasheet, PDF (18/40 Pages) C-Media Electronics – USB Audio Sound Chip

CM6502 / CM6502B
USB Audio Sound Chip
14
iManufacturer
1
15
iProduct
1
16
iSerialNumber
1
17
bNumConfigurations
1
01
Index of string descriptor describing manufacturer
02
Index of string descriptor describing product
00
Index of string descriptor describing serial number
01
Number of configuration
Configuration Descriptor
Offset
Field
0
bLength
1
bDescriptorType
2
wTotalLength
4
bNumInterfaces
5
bConfigurationValue
6
iConfiguration
7
bmAttributes
8
bMaxPower
Size
1
1
2
1
1
1
1
1
Value (Hex)
Description
09
Descriptor length
02
Configuration Descriptor
00A0
Total length of data returned for this configuration:
160 Bytes
03
Number of interfaces supported by this Configuration:
00: Control
01: ISO-In
03: HID
01
Configuration value
00
Index of string descriptor describing this configuration
80
Attributes(Bus Powered)
32
Maximum power consumption from bus = 100mA:
8’h32 (50x2 mA) (PWRSEL_2 = 1)
Audio Control Interface 0 Descriptor 0
Offset
Field
Size Value (Hex)
Description
0
bLength
1
09
Descriptor length
1
bDescriptorType
1
04
Interface Descriptor
2
bInterfaceNumber
1
00
Interface number
3
bAlternateSetting
1
00
Alternate interface
4
bNumEndpoints
1
00
Number of endpoint used by this interface
5
bInterfaceClass
1
01
Audio Interface Class
6
bInterfaceSubClass
1
01
Subclass code: AUDIO_CONTROL
7
bInterfaceProtocol
1
00
Protocol code
8
iInterface
1
00
Index of string descriptor describing this interface
7 Function Description
7.1 Playback Equalizer
7.1.1 5-band Equalizer
CM6502 / CM6502B has integrated 5-band hardware digital equalizer (EQ) engine inside the chips to fulfill
various application usages. It provides up-to-4 preset modes on customer’s product design for different
user scenarios including default/music, movies, Gaming and communication modes. Customers could also
change the gain parameters for each of the preset application EQ mode via EEPROM coding. In addition,
the EQ engine could also be utilized for compensating and fine-tuning the headphone driver for Sound
Pressure Level (SPL) performance to a specific preference. In this case, customers could fully customize
all EQ coefficients (center frequency, gain values, and bandwidth) to one optimized frequency response
curve and setting in terms of the headphone driver and housing’s acoustics characteristics, also via
www.cmedia.com.tw
Copyright © C-Media Electronics Inc.
Rev. 1.02 ︱ Page 18