GL850G View Datasheet(PDF) - Genesys Logic

Part Name

Description

Manufacturer

GL850G

USB 2.0 HUB Controller

Genesys Logic 

HS vs. HS:

Traffic channel is

routed to REPEATER

GL850G USB 2.0 Low-Power HUB Controller

USB2.0 HOST/HUB

USPORToperating

in HS signaling

REPEATER

TT

HS vs. FS/LS:

Traffic channel

is routed to TT

DSPORT operating

in HS signaling

DSPORT operating

in FS/LS signaling

Figure 5.2 – Operating in USB 2.0 scheme

5.12 DSPORT logic

DSPORT (downstream port) logic implements the control logic defined in section 11.5 of USB specification

Revision 2.0. It mainly manipulates the state machine, the connection/disconnection detection, over current

detection and power enable control, and the status LED control of the downstream port. Besides, it also

output the control signals to the DSPORT transceiver.

5.13 DSPORT Transceiver

DSPORT transceiver is the analog circuit that supports high-speed, full-speed, and low-speed electrical

characteristics defined in chapter 7 of USB specification Revision 2.0. In addition, each DSPORT

transceiver accurately controls its own squelch level to detect the detachment and attachment of devices.

5.2 Configuration and I/O Settings

5.2.1 RESET# Setting

GL850G integrates in the pull-up 15KΩ resister of the upstream port. When RESET# is enabled, the

internal 15KΩ pull-up resister will be disconnected to the 3.3V power. To meet the requirement (p.141) of

the USB 2.0 specification, pull-up resister should be disconnected while lacking of USB cable power

(Vbus).

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

Page 16

Share Link: