CM6502B Datasheet, PDF(3/40 Page) C-Media Electronics

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CM6502B Datasheet, PDF (3/40 Pages) C-Media Electronics – USB Audio Sound Chip

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CM6502 / CM6502B

USB Audio Sound Chip

TABLE OF CONTENTS

1 Description and Overview ............................................................................................................... 5

2 Features ............................................................................................................................................ 5

3 Applications ..................................................................................................................................... 7

4 Block Diagram ................................................................................................................................. 8

5 Pin Assignment ................................................................................................................................ 9

5.1 Pin-Out Diagram ................................................................................................................. 9

5.2 Pin Description...................................................................................................................11

6 USB Audio Topology..................................................................................................................... 13

6.1 Headset Topology.............................................................................................................. 13

6.2 Speaker Topology.............................................................................................................. 14

6.3 Docking Topology............................................................................................................. 16

6.4 Microphone (Stereo) Topology ......................................................................................... 17

7 Function Description...................................................................................................................... 18

7.1 Playback Equalizer............................................................................................................ 18

7.1.1 5-band Equalizer .................................................................................................... 18

7.1.2 4 preset EQ mode ................................................................................................... 21

7.2 Recording Equalizer.......................................................................................................... 22

7.3 Recording AGC................................................................................................................. 22

7.4 HID Function .................................................................................................................... 24

7.4.1 HID interrupt in...................................................................................................... 24

7.4.2 HID Get_Input_report............................................................................................ 24

7.4.3 HID Set_Output_report.......................................................................................... 26

7.5 Vendor Command Definition ............................................................................................ 27

7.5.1 Vender Command Read ......................................................................................... 27

7.5.2 Vender Command Write......................................................................................... 27

7.6 SPDIF Control Description............................................................................................... 28

7.6.1 SPDIF Frame Description ...................................................................................... 28

7.6.2 SPDIF Out Channel Status..................................................................................... 30

7.7 Digital Mic ........................................................................................................................ 30

7.8 I2C Interface ..................................................................................................................... 32

7.8.1 I2C Master Mode ................................................................................................... 32

7.8.2 I2C-Master Read with clk_sync mode................................................................... 32

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