GL850G-MNGXX GENESYS [GENESYS LOGIC], GL850G-MNGXX Datasheet - Page 16

• Manufacturer Part Number: GL850G-MNGXX
• Description: USB 2.0 HUB Controller
• Manufacturer: GENESYS [GENESYS LOGIC]

5.2 Configuration and I/O Settings
©2000-2007 Genesys Logic Inc. - All rights reserved.
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.
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.
GL850G integrates in the pull-up 15K resister of the upstream port. When RESET# is enabled, the
internal 15K 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).
5.12 DSPORT logic
5.13 DSPORT Transceiver
5.2.1 RESET# Setting
HS vs. HS:
Traffic channel is
routed to REPEATER
DSPORT operating
in HS signaling
Figure 5.2 – Operating in USB 2.0 scheme
REPEATER
GL850G USB 2.0 Low-Power HUB Controller
USB2.0 HOST/HUB
TT
USPORToperating
in HS signaling
DSPORT operating
in FS/LS signaling
HS vs. FS/LS:
Traffic channel
is routed to TT
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