CM6631A Datasheet, PDF (4/16 Pages) C-Media Electronics – USB 2.0 High-Speed True HD Audio Processor

CM6631A
USB 2.0 High-Speed True HD Audio Processor
1 Description and Overview
Cmedia CM6631A is a USB2.0 true high-speed audio processor that can support the latest USB Audio Device
Class Definition V2.0 and high-definition audio processing capability up to 192KHz/32bit. CM6631A provides
the industrial standard I2S and HDA audio interface and also integrates 192KHz/24bit S/PDIF
transmitter/receiver and MIDI I/O device. It’s suitable for versatile, high-profile, typical 2-channel I/O audio
applications. Furthermore, CM6631A has an embedded 8051 microprocessor that can enhance the best
flexibility and functionality with external upgradeable F/W codes. CM6631A would be the most high-fidelity
and powerful audio core for high-value USB2.0 audio products.
2 Features
USB Compliance
 USB Spec. Rev.2.0 high-speed/full-speed mode compatible
 Latest USB Audio Device Class Definition Release v.2.0/1.0 compatible
 USB Human Interface Device (HID) Class Definition Release 1.1 compliant
 Supports USB suspend/resume/reset functions
 Supports control, interrupt, bulk, and isochronous data transfers
 Asynchronous synchronization transfer to reduce clock jitter
Audio Engine
 Max. 3 Independent Playback Streams:
 Default Sample Rates: 192K/176.4K/96K/88.2K/48K/44.1KHz (192K/176.4KHz are available only in
USB Audio Class 2.0/High-speed mode)
 Supported Bit Length: 16/24/32 bit
 PDMA#A and C engines support 2-channel data to I2S/HDA output
 PDMA#B supports S/PDIF output
 Max. 3 Independent Capture Streams:
 Default Sample Rates: 192K/176.4K/96K/88.2K/48K/44.1KHz (192K/176.4KHz are available
only in USB Audio Class
 2.0/High-speed mode)
 Supported Bit Length: 16/24/32 bit
 RDMA#A and B support 2-channel data from I2S/HDA input
 RDMA#C supports S/PDIF input (192KHz is supported only with Crystal and PLL clock source)
 Digital mixing/routing engine to mix input streams to output streams
Audio I/O
 2 pairs I2S or Left-Justified serial audio output interface
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