cmedia

name	cmedia
description	C-Media Electronics MPN encoding patterns, USB audio controller decoding, and handler guidance. Use when working with C-Media audio ICs or CMediaHandler.

C-Media Electronics Manufacturer Skill

MPN Structure

C-Media specializes in USB and HD audio controller ICs.

CM Series (USB Audio)

CM[SERIES][VARIANT]-[PACKAGE][PINS]
   |   |      |        |       |
   |   |      |        |       +-- Pin count (optional)
   |   |      |        +-- Package code (QFP, LQFP, etc.)
   |   |      +-- Variant (A, AH, B)
   |   +-- Series (108, 109, 119, 6xxx)
   +-- CM = C-Media prefix

CMI Series (HD/PCI Audio)

CMI[SERIES][VARIANT]
    |   |      |
    |   |      +-- Variant suffix
    |   +-- Series (8738, 8768, 8788)
    +-- CMI = C-Media Interface

Example Decoding

CM108AH
|  | ||
|  | |+-- H = variant revision
|  | +-- A = first variant
|  +-- 108 = Basic USB stereo audio codec
+-- CM = C-Media prefix

CM6631A-S
|  |   ||
|  |   |+-- S = SSOP package
|  |   +-- A = variant
|  +-- 6631 = Professional USB 2.0 audio processor
+-- CM = C-Media prefix

CMI8788
|   |||
|   ||+-- 8 = series number
|   |+-- 8 = 8-channel HD audio
|   +-- 87 = HD audio codec series
+-- CMI = C-Media Interface

---

Product Families

CM108 Series - Basic USB Audio Codec

Entry-level USB stereo audio for PC peripherals.

Part	Description	Features
CM108	USB stereo codec	Basic stereo
CM108AH	Enhanced version	Higher quality
CM108B	Cost-optimized	Lower cost

CM109 Series - USB Audio with HID

USB audio with keyboard/HID controller for headsets.

Part	Description
CM109	USB audio + HID keyboard
CM109A	Enhanced variant

CM119 Series - USB 7.1 Channel Audio

Multi-channel USB audio for gaming and surround sound.

Part	Description	Channels
CM119	7.1 USB audio	8
CM119A	Enhanced version	8
CM119B	Cost-optimized	8

CM6xxx Series - Professional USB Audio

Higher-end USB audio ICs for professional applications.

Part	Description
CM6206	USB 2.0 basic audio
CM6400	USB audio controller
CM6631	USB 2.0 audio processor
CM6631A	Enhanced CM6631
CM6632	USB audio DAC

CMI87xx Series - HD Audio Codec (PCI/PCIe)

HD audio codecs for motherboards and sound cards.

Part	Description	Features
CMI8738	PCI audio codec	Legacy 7.1
CMI8768	PCI-E audio	7.1 surround
CMI8788	Oxygen HD Audio	High-end 8-ch

CMI83xx Series - Legacy PCI Audio

Older PCI audio codecs.

Part	Description
CMI8330	Legacy PCI audio

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Package Codes

Code	Package	Notes
QFP	QFP	Quad flat package
LQFP, LQ	LQFP	Low-profile QFP
QFN	QFN	Quad flat no-lead
SSOP, S	SSOP	Shrink small outline
TQFP	TQFP	Thin QFP
PLCC	PLCC	Plastic leadless
BGA	BGA	Ball grid array

Package Code Extraction

// Handle hyphenated suffixes
// CM6631A-LQ -> LQFP
// CM6631A-S -> SSOP

// Handle embedded package codes
// After variant letters, look for package indicators

---

Variant Suffixes

Suffix	Meaning
A	First variant revision
AH	Enhanced variant
B	Second variant (often cost-optimized)

---

Handler Implementation Notes

Series Extraction

// CM108, CM109, CM119 - return 5 characters
if (upperMpn.matches("^CM108.*")) return "CM108";
if (upperMpn.matches("^CM109.*")) return "CM109";
if (upperMpn.matches("^CM119.*")) return "CM119";

// CM6xxx - return 6 characters (CM + 4 digits)
if (upperMpn.matches("^CM6[0-9]{3}.*")) {
    return upperMpn.substring(0, 6);  // CM6631
}

// CMI87xx - return 7 characters (CMI + 4 digits)
if (upperMpn.matches("^CMI87[0-9]{2}.*")) {
    return upperMpn.substring(0, 7);  // CMI8788
}

Base Part Number Extraction

// Include variant letters in base part
// CM108AH -> CM108AH
// CM6631A -> CM6631A

// Stop at package indicators
if (remaining.matches("^(QFP|LQFP|QFN|SSOP|TQFP).*")) {
    break;
}

Matching Patterns

// CM10x series
"^CM10[89][A-Z]*.*"

// CM119 series
"^CM119[A-Z]*.*"

// CM6xxx series
"^CM6[0-9]{3}[A-Z]*.*"

// CMI87xx series
"^CMI87[0-9]{2}[A-Z]*.*"

// CMI83xx series
"^CMI83[0-9]{2}[A-Z]*.*"

---

Replacement Rules

Same Series Variants

Parts in the same series with different variants (A, AH, B) are generally compatible:

• CM108 -> CM108A -> CM108AH (increasing quality)
• CM119 -> CM119A -> CM119B (same features, different optimization)

Different Series

Different series are NOT compatible (different USB classes, channel counts):

• CM6206 != CM6631 (different USB audio implementations)
• CM108 != CM119 (stereo vs 7.1 channel)

---

Related Files

• Handler: manufacturers/CMediaHandler.java
• Component types: ComponentType.IC

---

Common MPNs

MPN	Description	Application
CM108AH	USB stereo codec	USB headsets
CM109	USB audio + HID	Gaming headsets
CM119	USB 7.1 audio	Gaming audio
CM6631A	USB 2.0 audio processor	USB DACs
CM6632	USB audio DAC	External audio
CMI8788	Oxygen HD Audio	Sound cards

---

USB Class Compliance

Series	USB Class	Driver Required
CM108	USB Audio Class 1.0	No (driverless)
CM119	USB Audio Class 1.0	No (driverless)
CM6631	USB Audio Class 2.0	Yes (on Windows)

---

Applications

• USB headsets
• USB sound cards
• Gaming audio devices
• USB DACs
• Webcams with audio
• Conference devices
• PCI/PCIe sound cards
• Motherboard audio

---

Learnings & Edge Cases

• CM vs CMI prefix: CM = USB audio controllers, CMI = PCI/PCIe HD audio codecs.
• USB Class matters: CM108/CM119 are class-compliant (driverless), CM6631 needs drivers on Windows.
• 7.1 channel support: CM119 series is for 7.1 surround, CM108 is stereo only.
• HID keyboard support: CM109 has integrated HID controller for headset buttons/volume.
• CMI8788 "Oxygen": High-end part used in audiophile sound cards (Asus Xonar, etc.).
• Variant progression: A < AH < B is not always quality progression - check datasheets.
• Package suffix position: Package code comes after variant letter(s) in hyphenated format.