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. This is a performance better
choice for USB 2.0 hub.
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
Support gang mode of power management and over-current detection for downstream ports
Conform to bus power requirements
Automatic switching between self-powered and bus-powered modes
Integrate USB 2.0 transceiver
PLL embedded with external 12 MHz crystal
Operate on 3.3 Volts
Embed serial resister for USB signals and integrate pull-up resister for upstream USB signal
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
Applications:
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Stand-alone USB hub
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Monitor hub
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PC motherboard USB hub, Docking of notebook
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Any compound device to support USB HUB function
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