CM6571 Datasheet, PDF (3/63 Pages) C-Media Electronics – USB 2.0 full speed-compliant

CM6571
USB Audio Sound Chip
TABLE OF CONTENTS
1 Description and overview ..................................................................................................................... 5
2 Ordering information ............................................................................................................................ 5
3 Features ................................................................................................................................................. 5
4 Applications .......................................................................................................................................... 8
5 Block diagram ....................................................................................................................................... 8
6 Pin assignment ...................................................................................................................................... 9
6.1 Pin-out diagram............................................................................................................................... 9
6.2 Pin description .............................................................................................................................. 10
7 Application mode................................................................................................................................ 13
7.1 Audio flow .................................................................................................................................... 13
7.1.1 recording path ...................................................................................................................... 13
7.1.2 playback path ....................................................................................................................... 13
7.2 Signal connection diagram............................................................................................................14
7.2.1 AEC system diagram............................................................................................................ 14
7.2.2 ENC system diagram ........................................................................................................... 16
7.2.3 Array system diagram .......................................................................................................... 18
7.2.4 play sound effect system diagram ........................................................................................ 20
8 USB function description....................................................................................................................21
8.1 USB audio topology......................................................................................................................21
8.2 Example topology –headset .......................................................................................................... 21
8.3 USB HID.......................................................................................................................................29
8.3.1
HID interrupt in....................................................................................................... 29
8.3.2
HID get_input_report.............................................................................................. 30
8.3.3
HID set_output_report ............................................................................................ 31
8.4 USB vender command definition.................................................................................................. 32
8.4.1
vender command read ............................................................................................. 32
8.4.2
vender command write............................................................................................ 32
8.5 I2C interface.................................................................................................................................. 33
8.5.1
I2C master mode ..................................................................................................... 33
8.5.1.1 I2C protocol timing........................................................................................................33
8.5.1.2 I2C-master read with clk_sync mode ............................................................................ 34
8.5.2
I2C slave mode ....................................................................................................... 34
8.6 I2S control description .................................................................................................................. 35
8.6.1
I2S format description............................................................................................. 35
8.6.2
I2S mclk/bclk/lrck ratio and format ........................................................................ 37
8.7 SPDIF control description............................................................................................................. 39
Revised: Nov. 2012
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