GL850G

Product Summary

GL850G 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.

Features

? Compliant to USB specification Revision 2.0
?Support 4/3/2 downstream ports by I/O pin configuration
?Upstream port supports both high-speed (HS) and full-speed (FS) traffic
?Downstream ports support HS, FS, and low-speed (LS) traffic
?1 control pipe (endpoint 0, 64-byte data payload) and 1 interrupt pipe (endpoint 1, 1-byte data payload)
?Backward compatible to USB specification Revision 1.1

? On-chip 8-bit micro-processor
?RISC-like architecture
?USB optimized instruction set
Performance: 6 MIPS @ 12MHz?With 64-byte RAM and 2K mask ROM
?Support customized PID, VID by reading external EEPROM
?Support downstream port configuration by reading external EEPROM

? Single Transaction Translator (STT)
--Single TT shares the same TT control logics for all downstream port devices. This is the most costeffective solution for TT. Multiple TT provides individual TT control logics for each downstream port.This is a performance better choice for USB 2.0 hub. Please refer to GL852 datasheet for more detailed information

? Integrate USB 2.0 transceiver
? Each downstream port supports two-color status indicator, with automatic and manual modes compliant toUSB specification Revision 2.0
? Built-in upstream 1.5K pull-up and downstream 15K pull-down
? Embed serial resister for USB signals
? Support both individual and gang modes of power management and over-current detection fordownstream ports
? Conform to bus power requirements
? Automatic switching between self-powered and bus-powered modes
? Support compound-device (non-removable in downstream ports) by I/O pin configuration
? Configurable non-removable device support
? PLL embedded with external 12 MHz crystal
? Embeds 5V to 3.3V regulator
? Low power consumption
? Improve output drivers with slew-rate control for EMI reduction
? Internal power-fail detection for ESD recovery
? Full function in 48-pin LQFP package
? Applications:
?Stand-alone USB hub
?PC motherboard USB hub, Docking of notebook
?LCD monitor hub
?Any compound device to support USB HUB function

Diagrams

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