GL850 datasheet(10/40 Pages) ETC

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GL850 USB 2.0 4-Port HUB Controller

Page 10

CHAPTER 2 FEATURES

• Compliant to USB specification Revision 2.0

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4 downstream ports

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Upstream port supports both high-speed (HS) and full-speed (FS) traffic

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Downstream ports support HS, FS, and low-speed (LS) traffic

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1 control pipe (endpoint 0, 64-byte data payload) and 1 interrupt pipe (endpoint 1, 1-byte data

payload)

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Backward compatible to USB specification Revision 1.1

• On-chip 8-bit micro-processor

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RISC-like architecture

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USB optimized instruction set

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Dual cycle instruction execution

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Performance: 6 MIPS @ 12MHz

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With 64-byte RAM and 2K internal ROM

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Support customized PID, VID by reading external EEPROM

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Support downstream port configuration by reading external EEPROM

• Single Transaction Translator (TT) architecture

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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:

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Stand-alone USB hub

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PC motherboard USB hub, Ducking of notebook

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Any compound device to support USB HUB function

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