參數(shù)資料
型號(hào)： GL850
廠商： Electronic Theatre Controls, Inc.
英文描述： USB 2.0 4-PORT HUB Controller
中文描述： 個(gè)USB 2.0 4端口集線器控制器
文件頁(yè)數(shù)： 17/40頁(yè)
文件大小： 382K
代理商： GL850
GL850 USB 2.0 4-Port HUB Controller
2000-2003 Genesys Logic Inc.—All rights reserved.
Page 17
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. GL850 adopts the single TT architecture to provide the most cost effective
solution. Single TT shares the same buffer control module for each downstream port.
5.1.11 REPEATER/TT routing logic
REPEATER and TT are the major traffic control machines in the USB2.0 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 USB2.0 hub is connected to the downstream port of an USB1.1 host/hub, it will operate in USB1.1
mode. For an USB1.1 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.
USB1.1 HOST/HUB
REPEATER
TT
DSPORT operating
in FS/LS signaling
USPORToperating
in FS signaling
Traffic channel
is routed to
REPEATER
Figure 5.1 - Operating in USB1.1 scheme
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