[Genesys-Logic]

GENERAL DESCRIPTION

GL850 is a 4-port standard Universal Serial Bus (USB) hub controller complies with Universal Serial Bus Specification Revision 2.0. GL850 can be connected to an USB1.1 host/hub or an USB2.0 host/hub. When GL850 is connected to an USB1.1 host/hub, it works just like an USB1.1 hub; the upstream port will operate in full-speed (FS) and the downstream port can operate in full-speed or low-speed (LS). When GL850 is connected to an USB2.0 host/hub, it works as an USB2.0 hub; the upstream port will operate in high-speed (HS) and the downstream port can operate in high-speed, full-speed, or low-speed. The bandwidths of high speed, full speed, and low speed are 480 Mbps, 12 Mbps, and 1.5 Mbps respectively.

FEATURES

• Compliant to USB specification Revision 2.0

− 4 downstream ports

− 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

− Dual cycle instruction execution

− Performance: 6 MIPS @ 12MHz

− With 64-byte RAM and 2K internal ROM

− Support customized PID, VID by reading external EEPROM

− Support downstream port configuration by reading external EEPROM

• Single Transaction Translator (TT) architecture

− Single TT shares the same TT control logics for all downstream port devices. This is the most cost effective solution for TT

• Each downstream port supports two-color status indicator, with automatic and manual modes compliant to USB specification Revision 2.0

• Support both individual and gang modes of power management and over-current detection for downstream ports

• Conform to bus power requirements

• Automatic switching between self-powered and bus-powered modes

• Integrated USB2.0 transceiver

• 0.35um CMOS technology

• PLL embedded with external 12 MHz crystal

• Operate on 3.3 Volts

• Improved output drivers with slew-rate control for EMI reduction

• Internal power-fail detection for ESD recovery

• 64-pin LQFP package

• Applications:

− Stand-alone USB hub

− PC motherboard USB hub, Ducking of notebook

− Any compound device to support USB HUB function