gl850g Genesys Logic, gl850g Datasheet - Page 17

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gl850g

Manufacturer Part Number
gl850g
Description
Gl850g Usb 2.0 Low-power Hub Controller
Manufacturer
Genesys Logic
Datasheet

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©2000-2008 Genesys Logic Inc. - All rights reserved.
TT implements the control logic defined in section 11.14 ~ 11.22 of USB specification Revision 2.0. TT
basically handles the unbalanced traffic speed between the USPORT (operating in HS) and DSPORTS
(operating in FS/LS) of hub. GL850G adopts the single TT architecture to provide the most cost effective
solution. Single TT shares the same buffer control module for each downstream port. GL852 adopts
multiple TT architecture to provide the most performance effective solution. Multiple TT provides control
logics for each downstream port respectively. Please refer to GL852 datasheet for more detailed
information.
REPEATER and TT are the major traffic control machines in the USB 2.0 hub. Under situation that
USPORT and DSPORT are signaling in the same speed, REPEATER/TT routing logic switches the traffic
channel to the REPEATER. Under situation that USPORT is in the high speed signaling and DSPORT is in
the full/low speed signaling, REPEATER/TT routing logic switches the traffic channel to the TT.
If an USB 2.0 hub is connected to the downstream port of an USB 1.1 host/hub, it will operate in USB 1.1
mode. For an USB 1.1 hub, both upstream direction traffic and downstream direction traffic are passing
through REPEATER. That is, the REPEATER/TT routing logic will route the traffic channel to the
REPEATER.
If an USB 2.0 hub is connected to an USB 2.0 host/hub, it will operate in USB 2.0 mode. The upstream port
signaling is in high speed with bandwidth of 480 Mbps under this environment. The traffic channel will
then be routed to the REPEATER when the device connected to the downstream port is signaling also in
high speed. On the other hand, the traffic channel will then be routed to TT when the device connected to
the downstream port is signaling in full/low speed.
5.1.10. TT (Transaction Translator)
5.1.11 REPEATER/TT routing logic
5.1.11.1 Connected to 1.1 Host/Hub
5.1.11.2 Connected to USB 2.0 Host/Hub
Traffic channel
is routed to
REPEATER
Figure 5.1 – Operating in USB 1.1 scheme
REPEATER
GL850G USB 2.0 Low-Power HUB Controller
USB1.1 HOST/HUB
TT
DSPORT operating
in FS/LS signaling
USPORToperating
in FS signaling
Page 17