GL850G是做HUB用的芯片

HUB就是 集线器

集线器的主要功能是对接收到的信号进行再生整形放大 以扩大网络的传输距离

GL850G在HUB主要作用是 分流

CHAPTER 1 GENERAL DESCRIPTIONGL850G is Genesys Logic’s advanced version Hub solutions which fully comply with Universal Serial BusSpecification Revision 2.0.GL850G embeds an 8-bit RISC processor to manipulate the control/status registers and respond to the requestsfrom USB host. Firmware of GL850G will control its general purpose I/O (GPIO) to access the externalEEPROM and then respond to the host the customized PID and VID configured in the external EEPROM.Default settings in the internal mask ROM is responded to the host without having external EEROM. GL850Gis designed for customers with much flexibility. The more complicated settings such as PID, VID, and numberof downstream ports settings are easily achieved by programming the external EEPROM (Ref. to Chapter 5).Each downstream port of GL850G supports two-color (green/amber) status LEDs to indicate normal/abnormalstatus. GL850G also support both Individual and Gang modes (4 ports as a group) for power management.The GL850G is a full function solution which supports both Individual/Gang power management modes andthe two-color (green/amber) status LEDs. Please refer the table in the end of this chapter for more detail.To fully meet the cost/performance requirement, GL850G is a single TT hub solution for the cost requirement.Genesys Logic also provides GL852 for multiple TT hub solution to target on systems which require higherperformance for full/low-speed devices, like docking station, embedded system … etc.. Please refer to GL852datasheet for more detailed information.*TT (transaction translator) is the main traffic control engine in an USB 2.0 hub to handle the unbalancedtraffic speed between the upstream port and the downstream ports.

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