GL852 USB 2.0 MTT HUB Controller

©2000-2007 Genesys Logic Inc. - All rights reserved.

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CHAPTER 1

GENERAL DESCRIPTION

GL852 is Genesys Logic’s brand new Hub solutions which fully comply with Universal Serial Bus

Specification Revision 2.0. This series includes GL852.

GL852 embeds an 8-bit RISC processor to manipulate the control/status registers and respond to the requests

from USB host. Firmware of GL852 will control its general purpose I/O (GPIO) to access the external

EEPROM and then respond to the host the customized PID and VID configured in the external EEPROM.

Default settings in the internal mask ROM is responded to the host without having external EEROM. GL852

is designed for customers with much flexibility. The more complicated settings such as PID, VID, and number

of downstream ports settings are easily achieved by programming the external EEPROM (Ref. to Chapter 5).

Each downstream port of GL852 supports two-color (green/amber) status LEDs to indicate normal/abnormal

status.

To fully meet the performance requirement, GL852 series is a multiple TT hub solution to provide every down

stream port with a TT. With the dedicated TT in each down stream port, GL852 can provide the best

performance even connect with several Full/Low-Speed devices and running heavy bandwidth-consuming

operations concurrently.

*TT (transaction translator) is the main traffic control engine in an USB 2.0 hub to handle the unbalanced

traffic speed between the upstream port and the downstream ports.

Product Name

Package type

Power mode

LED support

GL852

64LQFP

Individual/Gang

Green/Amber

GL852

48LQFP

Individual/Gang

Green/Amber

GL852

48QFN

Individual/Gang

Green/Amber