cmedia

# 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 | --- ## 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 ```java // 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 ```java // 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 ```java // 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 ```java // 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. <!-- Add new learnings above this line -->