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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
3.6.2.3 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 MSM7227 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.
3. Technical Brief
Name
Note
USBH_CLK
Input clock from TCXO
Table. HSUSB Signal Interface
Figure. USB block(MSM7227 Side & MAX14526 Side)
MSM7227
USBH_CLK
USBH_DM
u-USB
Connector.
3.3V LDO
USBH_CS
USBH_DP
MAX14526
DM
DP
TCXO.
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