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
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
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On-chip 8-bit micro-processor
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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
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Multiple Transaction translator (MTT)
MTT provides respective TT control logics for each downstream port.
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Each downstream port supports two-color status indicator, with automatic and manual modes compliant to
USB specification Revision 2.0
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Built-in upstream port 1.5KΩ pull-up and downstream port 15KΩ pull-down resistors
Support both individual and gang modes of power management and over-current detection for
downstream ports
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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)
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Number of Downstream port can be configured by GPIO without external EEPROM (Not available on
QFN 28 package)
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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
UMPC/MID, motherboard on-board applications
Consumer electronics built-in hub application
Monitor built-in hub
Embedded systems
Compound device to support USB HUB function such as keyboard hub applications
©2000-2009 Genesys Logic Inc. - All rights reserved.
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