CM6632A
INTRODUCTION

The CM6632A is a USB 2.0 high-speed audio processor that supports the latest  USB Audio Class 2.0 and high-definition audio processing applications. The CM6632A provides industry-standard HDA and I2S I/O interfaces, supports a maximum of 10 channels of output and 4 channels of input, and also integrates a 192KHz/24-bit S/PDIF transmitter and receiver, making it very versatile.

Furthermore, the CM6632A has an embedded 8051 microprocessor that can enhance the flexibility and functionality with external upgradeable ROM codes. The CM6632A is the most powerful audio core for your high-value USB Audio Class 2.0 products.
CM6632A is also capable to support DSD bit stream output. It’s a lossless SACD playback technique in PC/Notebook.

PRODUCT FEATURES
USB Compliance
  • USB specification 2.0 high-speed-compatible
  • Latest USB audio device class 2.0/1.0-compatible
  • USB human interface device (HID) Class 1.1-compliant
  • Supports USB suspend/resume/reset functions
  • Asynchronous synchronization transfer to reduce clock jitter
  • Supports control/interrupt/bulk/isochronous data transfers

Audio Engine

  • 3 Independent playback streams:
    -Supported sample rate: 44.1K/48K/88.2K/96K/176.4K/192KHz (192K/176.4KHz are available only in USB Audio Class 2.0/High-speed mode)
    -Supported bit length: 16/24/32-bit
    -PDMA#A supports max. 8-ch to I2S output
    -PDMA#B supports S/PDIF output
    -PDMA#C supports 2-ch to I2S output
  • 3 Independent capture streams:
    -Supported sample rate: 44.1K/48K/88.2K/96K/176.4K/192KHz (192K/176.4KHz are available only in USB Audio Class 2.0/High-speed mode)
    -Supported bit length: 16/24/32-bit
    -RDMA#A supports 2-ch from I2S input
    -RDMA#B supports 2-ch from I2S input
    -RDMA#C supports S/PDIF input (192KHz receiving supports only Crystal and PLL clock sources)

Audio I/O

  • Five pairs of I2S or left-justified serial audio output interfaces (8+2-ch out)
  • Two pairs of I2S or left-justified serial audio input interfaces (2+2-ch in)
  • All the I2S input/out interfaces support master/slave mode
  • Built-in 192K/176.4K/96K/88.2K/48K/44.1KHz, and 16/24-bit S/PDIF transmitter
  • Integrated 192K/176.4K/96K/88.2K/48K/44.1KHz, and 16/24-bit S/PDIF receiver
  • Supports S/PDIF IN-to-OUT loop-back path for signal transforming between TOSLINK and RCA connections


Integrated 8051 Micro-processor

  • Embedded 8051 micro-processor handles comment/protocol transactions
  • Connects to an external parallel Flash/EEPROM memory (64kb, 55ns access time is required) for firmware ROM codes
  • HID interrupts can be implemented via firmware codes
  • Provides maximum HW configuration flexibility with a firmware code upgrade
  • VID/PID/product string can be customized via firmware code programming


Control Interface

  • Master I2C control interface for external audio devices or EEPROM access
  • Slave I2C control interface for external MCU communication
  • 9 GPIO pins and 6 GPI pins

General

  • Embedded USB 2.0 transceiver (up to 480MB bandwidth)
  • Auto detection for high-speed/full-speed
  • GPIO pin for USB Audio Class 2.0 and 1.0 application mode configurations
  • Single 12MHz crystal input is required (embedded PLL function), or optional oscillator inputs for 49.152 or 24.576MHz (for x48KHz) and 45.158 or 22.5792MHz (for x44.1KHz)
  • Single 3.3V power supply (embedded 3.3V to 2.5V regulator for digital core)
  • 3.3V digital I/O pads with 5V tolerance
  • Industry-standard LQFP-100 package (16 x 16mm)


Optional Value-added Software Features

  • Cmedia vendor drivers supports USB Audio Class 2.0 and high-speed mode on Windows® XP, Windows® Vista, Windows® 7, Windows® 8 and Mac OS X 10.5.7 (or later) with Cmedia vendor drivers
  • USB audio class 1.0 with full-speed/high-speed modes compatible with the Windows® XP, Windows® Vista, Windows® 7 and Windows® 8 UAA driver, Mac OS X and Linux embedded USB audio drivers
  • For Windows, Cmedia drivers provide the following key features:                                -Playback feedback endpoints to control data transmission accuracy and maximize audio quality
    -Xear™ Pro
    *Support ASIO2.2 driver

 

BLOCK DIAGRAM
USB Audio,PCIe audio,USB audio ic,USB sound chip
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