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C-Media Electronics MPN encoding patterns, USB audio controller decoding, and handler guidance. Use when working with C-Media audio ICs or CMediaHandler.
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Based on SOC occupation classification
Use when refactoring, cleaning up, or enhancing the lib-electronic-components codebase. Provides guidance on architecture patterns, known issues, duplication hotspots, and recommended improvements.
Base skill for working with electronic components in this library. Use when adding new component types, manufacturer handlers, or working with MPN (Manufacturer Part Number) operations, BOM entries, or component classification.
Use this skill BEFORE creating a PR to ensure all documentation, skills, and learnings are updated. Critical for preserving institutional knowledge and preventing documentation drift.
Use when working with component similarity calculations - comparing MPNs, finding equivalent parts, implementing new similarity calculators, or understanding how component matching works.
Use when working with capacitor similarity calculations - comparing ceramic/electrolytic/film capacitor MPNs, understanding value/voltage/dielectric matching, or capacitor-specific similarity logic.
Use when working with connector similarity calculations - comparing connector MPNs, understanding pin count/pitch/family matching, or connector-specific similarity logic.
| 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 specializes in USB and HD audio controller ICs.
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][VARIANT]
| | |
| | +-- Variant suffix
| +-- Series (8738, 8768, 8788)
+-- CMI = C-Media Interface
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
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 |
USB audio with keyboard/HID controller for headsets.
| Part | Description |
|---|---|
| CM109 | USB audio + HID keyboard |
| CM109A | Enhanced variant |
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 |
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 |
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 |
Older PCI audio codecs.
| Part | Description |
|---|---|
| CMI8330 | Legacy PCI audio |
| 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 |
// Handle hyphenated suffixes
// CM6631A-LQ -> LQFP
// CM6631A-S -> SSOP
// Handle embedded package codes
// After variant letters, look for package indicators
| Suffix | Meaning |
|---|---|
| A | First variant revision |
| AH | Enhanced variant |
| B | Second variant (often cost-optimized) |
// 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
}
// Include variant letters in base part
// CM108AH -> CM108AH
// CM6631A -> CM6631A
// Stop at package indicators
if (remaining.matches("^(QFP|LQFP|QFN|SSOP|TQFP).*")) {
break;
}
// 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]*.*"
Parts in the same series with different variants (A, AH, B) are generally compatible:
Different series are NOT compatible (different USB classes, channel counts):
manufacturers/CMediaHandler.javaComponentType.IC| 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 |
| 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) |