CM6571 Datasheet, PDF (31/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
8.3.3 HID set_output_report
8.3.3.1 command format:
bmRequestType
bRequest
8’h 21
8’h 09
(Set_Report)
wValue
16’h 02 01
(Rpt Type + Rpt ID)
wIndex
16’h 00 03
(Interface)
wLength
16’h 00 10
(16 bytes)
Note: Byte5 is the beginning address of the write sequence.
Data
Report
8.3.3.2 output data format:
byte0
always 1 for org HID event report ID
byte1
start address of write reg (H-start_addr)
byte2
start address of write reg (L-start_addr)
byte3
effective write/read data length (<=12)
byte4
write data to [start_addr]
byte5
write data to [start_addr+1]
byte6
write data to [start_addr+2]
byte7
write data to [start_addr+3]
byte8
write data to [start_addr+4]
byte9
write data to [start_addr+5]
byte10
write data to [start_addr+6]
byte11
write data to [start_addr+7]
byte12
write data to [start_addr+8]
byte13
write data to [start_addr+9]
byte14
write data to [start_addr+10]
byte15
write data to [start_addr+11]
Revised: Nov. 2012
Page 31 / 63
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