This post explains for the semiconductor JMS539.
The Part Number is JMS539.
The function of this semiconductor is SuperSpeed USB to SATA II 3.0G Bridge.
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JMicron/JMS539 JMS539 SuperSpeed USB to SATA II 3.0G Bridge Description The JMS539 is a bridge controller, which translates the communication protocol between SATA II 3.0G and SuperSpeed USB commands. The integrated 60MIPS 8051, SATA II, Hi-Speed USB and SuperSpeed USB technology enable users to perform SuperSpeed USB to SATA II 3.0G, applications in a signal chip. In this chip, the Hi-Speed/SuperSpeed USB controller supports the USB Mass Storage Class Bulk-Only Transport Specification. Features • Complies with Gen2i/Gen2m of Serial ATA II Electrical Specification 2.6 • Supports SATA II Asynchronous Signal Recovery (Hot Plug) feature • Complies with USB 3.0 Specification, USB Mass Storage Class, Bulk-Only Transport Specification • Supports USB Super-Speed/High-Speed/Full-Speed Operation • Supports USB HID operation • Supports USB2.0/USB3.0 power saving mode • Supports AES-128/256 for data encryption over USB2.0/USB3.0 • Supports external SPI NVRAM for Vendor VID/PID o […]