CM6500B Datasheet, PDF (14/36 Pages) C-Media Electronics – USB Audio Sound Chip

CM6500 / CM6500B
USB Audio Sound Chip
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
011D Total length of data returned for this configuration:
285 Bytes
04
Number of interfaces supported by this Configuration:
00: Control
01: ISO-Out
02: ISO-In
03: INT-In (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
6.2 Speaker Topology
0x01
IT
USB STREAM
0x03
FEA
0x02
OT
SPEAKER
Device Descriptor
Offset
0
1
2
4
5
6
7
8
10
12
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
Size
1
1
2
1
1
1
1
2
2
2
Value (Hex)
Description
12
Descriptor length
01
Device Descriptor
0110 USB 1.1 compliant
00
Device class specified by interface
00
Device subclass specified by interface
00
Device protocol specified by interface
10
Endpoint zero packet size
0D8C Vendor ID
0180~018F Product ID
0000 Device release number
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Rev. 1.02 ︱ Page 14/16