GL852G-HHGXX View Datasheet(PDF) - Genesys Logic
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'GL852G-HHGXX' PDF : 38 Pages View PDF
GL852G Datasheet
5.1.9 REPEATER
Repeater logic implements the control logic defined in section 11.4 and section 11.7 of USB specification
Revision 2.0. REPEATER controls the traffic flow when upstream port and downstream port are signaling in
the same speed. In addition, REPEATER will generate internal resume signal whenever a wakeup event is
issued under the situation that hub is globally suspended.
5.1.10 TT (Transaction Translator)
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. GL852G adopts multiple TT architecture to provide the most performance
effective solution. Multiple TT provides control logics for each downstream port respectively.
5.1.11 REPEATER/TT Routing Logic
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.
5.1.11.1 Connected to 1.1 Host/Hub
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.
Figure 5.1 - Operating in USB 1.1 Schemes
©2012 Genesys Logic, Inc. - All rights reserved.
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