參數(shù)資料
型號(hào)： GL852-ONGXX
廠商： Genesys Logic, Inc.
英文描述： USB 2.0 MTT HUB Controller
中文描述： MTT法的USB 2.0集線器控制器
文件頁數(shù)： 18/31頁
文件大小： 516K
代理商： GL852-ONGXX
GL852 USB 2.0 MTT HUB Controller
2000-2007 Genesys Logic Inc. - All rights reserved.
Page 18
USB2.0 HOST/HUB
REPEATER
TT
USPORToperating
in HS signaling
HS vs. FS/LS:
Traffic channel
is routed to TT
HS vs. HS:
Traffic channel is
routed to REPEATER
DSPORT operating
in HS signaling
DSPORT operating
in FS/LS signaling
TT
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
GL852 integrates in the pull-up 1.5K
resister of the upstream port. When RESET# is enabled, the internal
1.5K
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).
Therefore, we suggest designing the RESET# circuit as following figure to meet the requirement mentioned
above.
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