Cantara/jmicron
.claude/skills/manufacturers/jmicron/SKILL.md
JMicron Technology MPN encoding patterns, series identification, and handler guidance. Use when working with storage controller ICs or JMicronHandler.
$ install --global
skillsauthnpx skillsauth add Cantara/lib-electronic-components jmicronInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Apr 16, 2026, 6:04 PM7.6s1 file scanned
SKILL.md
- name:
- jmicron
- description:
- JMicron Technology MPN encoding patterns, series identification, and handler guidance. Use when working with storage controller ICs or JMicronHandler.
JMicron Technology Manufacturer Skill
MPN Structure
JMicron MPNs follow these general structures:
JMS[SERIES][VARIANT][PACKAGE] (USB-SATA bridges)
JMB[SERIES][VARIANT][PACKAGE] (PCIe/SATA controllers)
JMF[SERIES][VARIANT][PACKAGE] (Flash controllers)
JM20[SERIES][VARIANT][PACKAGE] (Legacy IDE/SATA)
| | | |
| | | └── Package code (QFN, LQFP, BGA, etc.)
| | └── Variant letter (optional)
| └── 3-digit series number
└── JMS/JMB/JMF/JM20 prefix
Example Decoding
JMS583-QFN
│ │ │
│ │ └── QFN package
│ └── 583 = USB 3.1 Gen2 to SATA/NVMe bridge
└── JMS = JMicron USB-SATA prefix
JMB585-LQFP
│ │ │
│ │ └── LQFP package
│ └── 585 = 5-port PCIe Gen3 SATA controller
└── JMB = JMicron board controller prefix
Product Series
JMS5xx Series - USB to SATA Bridges
| Series | Interface | Description | |--------|-----------|-------------| | JMS539 | USB 3.0 | USB 3.0 to SATA III bridge | | JMS567 | USB 3.0 | USB 3.0 to SATA III with UASP | | JMS578 | USB 3.1 Gen1 | USB 3.1 Gen1 to SATA III | | JMS583 | USB 3.1 Gen2 | USB 3.1 Gen2 to SATA III/NVMe |
JMB5xx Series - PCIe SATA Controllers
| Series | Interface | Description | |--------|-----------|-------------| | JMB575 | PCIe | 5-port SATA 6Gb/s controller | | JMB585 | PCIe Gen3 | 5-port SATA 6Gb/s PCIe Gen3 controller |
JMB3xx Series - SATA/PATA Controllers
| Series | Interface | Description | |--------|-----------|-------------| | JMB363 | PCIe | SATA/PATA combo controller | | JMB368 | PCIe | PATA controller |
JMF Series - Flash Controllers
| Series | Type | Description | |--------|------|-------------| | JMF60x | Flash | SSD controller (early gen) | | JMF61x | Flash | SSD controller | | JMF66x | Flash | SSD controller (newer gen) |
JM20xxx Series - Legacy Controllers
| Series | Interface | Description | |--------|-----------|-------------| | JM20330 | IDE/SATA | SATA to PATA bridge | | JM20337 | IDE/SATA | IDE to SATA bridge |
Package Codes
| Code | Package | Notes | |------|---------|-------| | QFN | QFN | Quad Flat No-Lead | | Q | QFN | Short form | | LQFP | LQFP | Low-profile Quad Flat Package | | L | LQFP | Short form | | BGA | BGA | Ball Grid Array | | B | BGA | Short form | | T | TQFP | Thin Quad Flat Package |
USB Generation by Series
| Series | USB Generation | Notes | |--------|----------------|-------| | JMS539 | USB 3.0 | 5Gbps | | JMS567 | USB 3.0 | 5Gbps, UASP support | | JMS578 | USB 3.1 Gen1 | 5Gbps | | JMS583 | USB 3.1 Gen2 | 10Gbps |
Feature Support Matrix
| Series | UASP | NVMe | Port Count | |--------|------|------|------------| | JMS539 | No | No | 1 | | JMS567 | Yes | No | 1 | | JMS578 | Yes | No | 1 | | JMS583 | Yes | Yes | 1 | | JMB575 | N/A | No | 5 | | JMB585 | N/A | No | 5 | | JMB363 | N/A | No | 2 | | JMB368 | N/A | No | 2 |
Handler Implementation Notes
Pattern Matching
// JMS5xx series - USB to SATA bridge controllers
"^JMS5[0-9]{2}[A-Z]*.*"
// JMB5xx series - PCIe SATA/NVMe controllers
"^JMB5[0-9]{2}[A-Z]*.*"
// JMB3xx series - SATA port multiplier/host controllers
"^JMB3[0-9]{2}[A-Z]*.*"
// JMF series - Flash memory controllers
"^JMF[0-9]+[A-Z]*.*"
// JMB4xx series - USB bridge controllers (legacy)
"^JMB4[0-9]{2}[A-Z]*.*"
// JM20xxx series - IDE/SATA controllers (legacy)
"^JM20[0-9]{3}[A-Z]*.*"
Series Extraction
// JMS/JMB series: prefix + 3 digits = 6 characters
// JMS583 -> JMS583
// JMB585 -> JMB585
if (upperMpn.matches("^JMS5[0-9]{2}.*")) {
return upperMpn.substring(0, 6);
}
// JMF series: variable length digits
// JMF612 -> JMF612
// JMF667 -> JMF667
// JM20xxx series: 7 characters
// JM20330 -> JM20330
Package Code Extraction
// Check hyphenated package codes first
// JMS583-QFN -> QFN
// Then check trailing letters after digits
// JMS583Q -> QFN (Q maps to QFN)
Replacement Compatibility
USB-SATA Bridge Upgrade Path
Higher generation can replace lower:
- JMS567 can replace JMS539 (adds UASP)
- JMS578 can replace JMS567 (USB 3.1 Gen1)
- JMS583 can replace JMS578 (USB 3.1 Gen2, adds NVMe)
Level hierarchy:
JMS539 (Level 1) < JMS567 (Level 2) < JMS578 (Level 3) < JMS583 (Level 4)
PCIe SATA Controllers
- JMB585 can replace JMB575 (newer, PCIe Gen3)
Non-Interchangeable
- JMS5xx (USB bridges) NOT compatible with JMB5xx (PCIe controllers)
- Different interface types cannot be swapped
Common Applications
| Series | Application | |--------|-------------| | JMS539/567/578/583 | External USB hard drive enclosures | | JMB575/585 | Multi-drive SATA expansion cards | | JMB363 | Motherboard SATA+PATA combo | | JMF series | SSD/Flash drive controllers |
Related Files
- Handler:
manufacturers/JMicronHandler.java - Component types:
ComponentType.IC
Learnings & Edge Cases
- JMS583 is unique for NVMe support: Only USB-SATA bridge that supports NVMe
- UASP support important for performance: JMS567+ support UASP for better performance
- Prefix indicates interface type: JMS = USB, JMB = PCIe board controller, JMF = Flash
- 5-port controllers: JMB575/585 are specifically 5-port SATA controllers
- Legacy JM20xxx series: Still found in older devices, uses 7-character part numbers
- Variable digit length in JMF: JMF series uses variable-length numeric suffixes
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