GL852 USB 2.0 MTT HUB Controller
CHAPTER 2 FEATURES
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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
Multiple Transaction translator (MTT)
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MTT provides respective TT control logics for each downstream port.
Each downstream port supports two-color status indicator, with automatic and manual modes compliant to
USB specification Revision 2.0
Built-in upstream port 1.5K
pull-up and downstream port 15K
pull-down resistors
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Support both individual and gang modes of power management and over-current detection for
downstream ports
Conform to bus power requirements of USB 2.0 specification
Automatic switching between self-powered and bus-powered modes
Integrate USB 2.0 transceiver
Embedded PLL support external 12 MHz crystal / Oscillator clock input
Optional 27/48 MHz Oscillator clock input (Not available on QFN 28 package)
Support compound-device (non-removable in downstream ports) by I/O pin configuration (Not available
on QFN 28 package)
Number of Downstream port can be configured by GPIO without external EEPROM (Not available on
QFN 28 package)
Operate on 3.3 Volts (Built-in 3.3V to 1.8V regulator)
Improve output drivers with slew-rate control for EMI reduction
Internal power-fail detection for ESD recovery
64-pin LQFP package , 48-pin LQFP package , 48-pin QFN package, 28-pin QFN package
Applications:
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Stand-alone USB hub / USB Docking
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UMPC/MID, motherboard on-board applications
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Consumer electronics built-in hub application
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Monitor built-in hub
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Embedded systems
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Compound device to support USB HUB function such as keyboard hub applications
©2000-2009 Genesys Logic Inc. - All rights reserved.
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