CM6571 Datasheet, PDF (32/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
8.4 USB vender command definition
8.4.1 vender command read
8.4.1.1 command format:
bmRequestType
bRequest
8’h C3
8’h 02
(Command 2)
wValue
16’h -- --
(Start Address of
input Data)
wIndex
16’h 00 00
wLength
16’h 00 –
(<=64 bytes)
8.4.1.2 input data format:
Byte0
Data of Reg[wValue]
Byte1
Data of Reg[wValue + 1]
Byte2
Data of Reg[wValue + 2]
…
…
Byte63
Data of Reg[wValue + 63]
8.4.2 vender command write
8.4.2.1 command format:
bmRequestType
bRequest
8’h 43
8’h 01
(Command 1)
wValue
16’h -- --
(Start Address of
Output Data)
wIndex
16’h 00 00
wLength
16’h 00 –
(<=64 bytes)
8.4.2.2 output data format:
Byte 0
Data of Reg[wValue]
Byte 1
Data of Reg[wValue + 1]
Byte 2
Data of Reg[wValue + 2]
…
…
Byte 63
Data of Reg[wValue + 63]
Data
Data
Data
Data
Revised: Nov. 2012
Page 32 / 63
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