Only For Training And Service Purposes - LG GW620 Servise Manual
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- User manual (408 pages) ,
- Quick reference manual (238 pages) ,
- User manual (106 pages)
Table of Contents
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3. Technical Brief
3.14.2.3. HS-USB
The universal serial bus (USB) is an interconnection standard widely supported by the electronic
industry. The USB2.0 spec defines data rates as low-speed (1.5 Mbps), full-speed (12Mbps) and hi-speed
(480 Mbps). When two devices are connected via a USB interface, one of the devices must act as a host,
and the other device must act as a peripheral. The host is responsible for initiating and controlling traffic on
the bus. The USB specification requires personal computers (PCs) to act as hosts, and other devices such as
printers, keyboards, mice, etc. to act as peripherals. The OTG supplement creates a new class of devices
called OTG devices. OTG devices can act as either hosts or peripherals, depending upon how they are
connected and/or used.
The MSM7200A device contains a new USB high-speed function that is based on a embedded UTMI+
core with a UTMI+ low pin interface (ULPI) compatible port. The MSM device's ULPI interface connects to an
external ULPI PHY chip to complete the design. The ULPI core embedded in the MSM along with the
PM7540 IC and a USB high-speed PHY IC provide support for the high-speed interface.
Name
USBH_CLK
USBH_DIR
USBH_NEXT
USBH_STOP
USBH_DATA[0:7]
MSM7200A
USBH_DATA[0:7]
LGE Internal Use Only
Note
Input clock from PHY
Controls the direction of USBH_DATA. When high, data
is driven into the MSM.
Used by the PHY to throttle data.
Signals the end of a USB transmit packet or a register
write operation, and optionally stops any receive.
Bi-directional data pin
PM7540
USBH_CS
USBH_CLK
USBH_DIR
ISP1508AET
USBH_NEXT
USBH_STOP
Figure. USB block(MSM7200A Side & ISP1508AET, MAX14526 Side)
Table. HSUSB Signal Interface
USBH_DM
MAX14526
USBH_DP
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Copyright © 2009 LG Electronics. Inc. All right reserved.
MAX_DP
u-USB
MAX_DM
Connector.
Only for training and service purposes
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Table of Contents
Troubleshooting
